VPNv4 Route Propagation in the MPLS VPN Network
The VRF separates the customer routes on the PE routers, but how are the prefixes transported across the service provider network? Because, potentially, numerous routes-perhaps hundred of thousands -could be transported, BGP is the ideal candidate because it is a proven and stable routing protocol for carrying that many routes. Just realize that BGP is the standard routing protocol for carrying the complete Internet routing table. Because the customer VPN routes are made unique by adding the RD to each IPv4 route-turning them into vpnv4 routes-all customer routes can safely be transported across the MPLS VPN network.
The PE router receives IPv4 routes from the CE router through an Interior Gateway Protocol (IGP) or external BGP (eBGP). These IPv4 routes from the VPN site are put into the VRF routing table. Which VRF is used depends on the VRF that is configured on the interface on the PE router toward the CE router. These routes are appended with the RD that is assigned to that VRF. Thus, they become vpnv4 routes, which are then put into MP-BGP. BGP takes care of distributing these vpnv4 routes to all PE routers in the MPLS VPN network. On the PE routers, the vpnv4 routes are stripped of the RDs and put into the VRF routing table as IPv4 routes. Whether the vpnv4 route, after stripping off the RD, is put into the VRF depends on whether the RTs allow the import into the VRF. These IPv4 routes are then advertised to the CE router through an IGP or eBGP that is running between the PE and CE router.
Because the service provider that is running the MPLS VPN network runs BGP in one autonomous system, iBGP is running between the PE routers. The propagation from eBGP-running between the PE and CE router-to MP-iBGP in the MPLS VPN network and vice versa is automatic and needs no extra configuration. However, the redistribution of MP-iBGP into the IGP that is running between the PE and CE router is not automatic. You need to configure mutual redistribution between MP-iBGP and the IGP.
1. Configure OSPF and EIGRP dynamic routing protocols on R1-PE1.
2. Configure RIPv2 and BGP dynamic routing protocols on R5-PE2.
The VRF separates the customer routes on the PE routers, but how are the prefixes transported across the service provider network? Because, potentially, numerous routes-perhaps hundred of thousands -could be transported, BGP is the ideal candidate because it is a proven and stable routing protocol for carrying that many routes. Just realize that BGP is the standard routing protocol for carrying the complete Internet routing table. Because the customer VPN routes are made unique by adding the RD to each IPv4 route-turning them into vpnv4 routes-all customer routes can safely be transported across the MPLS VPN network.
The PE router receives IPv4 routes from the CE router through an Interior Gateway Protocol (IGP) or external BGP (eBGP). These IPv4 routes from the VPN site are put into the VRF routing table. Which VRF is used depends on the VRF that is configured on the interface on the PE router toward the CE router. These routes are appended with the RD that is assigned to that VRF. Thus, they become vpnv4 routes, which are then put into MP-BGP. BGP takes care of distributing these vpnv4 routes to all PE routers in the MPLS VPN network. On the PE routers, the vpnv4 routes are stripped of the RDs and put into the VRF routing table as IPv4 routes. Whether the vpnv4 route, after stripping off the RD, is put into the VRF depends on whether the RTs allow the import into the VRF. These IPv4 routes are then advertised to the CE router through an IGP or eBGP that is running between the PE and CE router.
Because the service provider that is running the MPLS VPN network runs BGP in one autonomous system, iBGP is running between the PE routers. The propagation from eBGP-running between the PE and CE router-to MP-iBGP in the MPLS VPN network and vice versa is automatic and needs no extra configuration. However, the redistribution of MP-iBGP into the IGP that is running between the PE and CE router is not automatic. You need to configure mutual redistribution between MP-iBGP and the IGP.
1. Configure OSPF and EIGRP dynamic routing protocols on R1-PE1.
R1-PE1#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R1-PE1(config)#router
ospf 2 ?
vrf
VPN Routing/Forwarding Instance
<cr>
R1-PE1(config)#router ospf 2 vrf CUSTA
R1-PE1(config-router)#?
Router
configuration commands:
area OSPF area parameters
auto-cost Calculate OSPF interface cost
according to bandwidth
bfd BFD configuration commands
capability Enable specific OSPF feature
compatible OSPF compatibility list
default Set a command to its defaults
default-information Control distribution of default information
default-metric Set metric of redistributed routes
discard-route Enable or disable discard-route
installation
distance Define an administrative
distance
distribute-list Filter networks in routing updates
domain-id OSPF domain-id
domain-tag OSPF domain-tag
event-log OSPF Event Logging
exit Exit from routing protocol
configuration mode
help Description of the
interactive help system
ignore Do not complain about specific
event
interface-id Source of the interface ID
ispf Enable incremental SPF
computation
limit Limit a specific OSPF feature
local-rib-criteria Enable or disable usage of local RIB as
route criteria
log-adjacency-changes Log changes in adjacency state
max-lsa maximum number of LSAs OSPF
process will receive
max-metric Set maximum metric
maximum-paths Forward packets over multiple paths
mpls Configure MPLS routing
protocol parameters
neighbor Specify a neighbor router
network Enable routing on an IP network
no Negate a command or set
its defaults
nsf Non-stop forwarding
passive-interface Suppress routing updates on an interface
prefix-suppression OSPF prefix suppression
priority OSPF topology priority
queue-depth OSPF Hello/Router process queue
depth
redistribute Redistribute information from
another routing protocol
router-id router-id for this OSPF process
shutdown Shutdown the OSPF protocol under
the current instance
snmp Modify snmp parameters
summary-address Configure IP address summaries
timers Adjust routing timers
traffic-share How to compute traffic share over
alternate paths
ttl-security TTL security check
R1-PE1(config-router)#network
172.16.1.0 0.0.0.3 area 0
R1-PE1(config-router)#exit
R1-PE1(config)#router eigrp 100
R1-PE1(config-router)#?
Router
configuration commands:
address-family Enter Address Family command mode
auto-summary Enable automatic network number
summarization
bfd BFD configuration commands
default Set a command to its defaults
default-information Control distribution of default information
default-metric Set metric of redistributed routes
distance Define an administrative distance
distribute-list Filter entries in eigrp updates
eigrp EIGRP specific commands
exit Exit from routing protocol
configuration mode
maximum-paths Forward packets over multiple paths
metric Modify metrics and parameters
for advertisement
neighbor Specify a neighbor router
network Enable routing on an IP network
no Negate a command or set its
defaults
offset-list Add or subtract offset from EIGRP
metrics
passive-interface Suppress routing updates on an interface
redistribute Redistribute IPv4 routes from another
routing protocol
shutdown Shutdown this instance of EIGRP
summary-metric Specify summary to apply
metric/filtering
timers Adjust routing timers
traffic-share How to compute traffic share over
alternate paths
variance Control load balancing variance
R1-PE1(config-router)#address-family
?
ipv4
Address Family IPv4
R1-PE1(config-router)#address-family
ipv4 ?
unicast
Address Family Unicast
vrf
Specify a specific virtual routing/forwarding instance
R1-PE1(config-router)#address-family
ipv4 vrf CUSTB ?
autonomous-system Specify Address-Family Autonomous System
Number
<cr>
R1-PE1(config-router)#address-family
ipv4 vrf CUSTB autonomous-system ?
<1-65535> Autonomous System
R1-PE1(config-router)#address-family ipv4 vrf CUSTB autonomous-system 100
R1-PE1(config-router-af)#?
Address
Family configuration commands:
auto-summary Enable automatic network number
summarization
bfd BFD configuration commands
default Set a command to its defaults
default-information Control distribution of default information
default-metric Set metric of redistributed routes
distance Define an administrative distance
distribute-list Filter entries in eigrp updates
eigrp EIGRP specific commands
exit-address-family Exit Address Family configuration mode
help Description of the interactive
help system
maximum-paths Forward packets over multiple paths
maximum-prefix Maximum number of prefixes acceptable in
aggregate
metric Modify metrics and parameters
for advertisement
neighbor Specify a neighbor router
network Enable routing on an IP network
no Negate a command or set its
defaults
offset-list Add or subtract offset from EIGRP
metrics
passive-interface Suppress routing updates on an interface
redistribute Redistribute IPv4 routes from another
routing protocol
shutdown Shutdown address family
summary-metric Specify summary to apply
metric/filtering
timers Adjust routing timers
traffic-share How to compute traffic share over
alternate paths
variance Control load balancing variance
R1-PE1(config-router-af)#network
172.16.1.0 0.0.0.255
R1-PE1(config-router-af)#end
R1-PE1#
2. Configure RIPv2 and BGP dynamic routing protocols on R5-PE2.
R5-PE2#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R5-PE2(config)#router rip
R5-PE2(config-router)#?
Router
configuration commands:
address-family Enter Address Family command mode
auto-summary Enable automatic network number
summarization
default Set a command to its defaults
default-information Control distribution of default
information
default-metric Set metric of redistributed routes
distance Define an administrative
distance
distribute-list Filter networks in routing updates
exit Exit from routing protocol
configuration mode
flash-update-threshold Specify flash update threshold in second
help Description of the
interactive help system
input-queue Specify input queue depth
maximum-paths Forward packets over multiple paths
neighbor Specify a neighbor router
network Enable routing on an IP
network
no Negate a command or set
its defaults
offset-list Add or subtract offset from RIP
metrics
output-delay Interpacket delay for RIP updates
passive-interface Suppress routing updates on an interface
redistribute Redistribute information from
another routing
protocol
timers Adjust routing timers
traffic-share How to compute traffic share over
alternate paths
validate-update-source Perform sanity checks against source address
of
routing updates
version Set routing protocol version
R5-PE2(config-router)#version
?
<1-2>
rip version 1 or 2
R5-PE2(config-router)#version
2
R5-PE2(config-router)#address-family
?
ipv4
Address family
R5-PE2(config-router)#address-family
ipv4 ?
unicast
Address Family Modifier
vrf
Specify parameters for a VPN Routing/Forwarding instance
<cr>
R5-PE2(config-router)#address-family
ipv4 vrf ?
WORD
VPN Routing/Forwarding instance name
R5-PE2(config-router)#address-family ipv4 vrf CUSTA
R5-PE2(config-router-af)#?
Router
Address Family configuration commands:
auto-summary Enable automatic network number
summarization
default Set a command to its defaults
default-information Control distribution of default
information
default-metric Set metric of redistributed routes
distance Define an administrative
distance
distribute-list Filter networks in routing updates
exit-address-family Exit from Address Family configuration
mode
help Description of the
interactive help system
maximum-paths Forward packets over multiple paths
neighbor Specify a neighbor router
network Enable routing on an IP
network
no Negate a command or set
its defaults
offset-list Add or subtract offset from RIP
metrics
redistribute Redistribute information from
another routing
protocol
timers Adjust routing timers
traffic-share How to compute traffic share over
alternate paths
validate-update-source Perform sanity checks against source address
of
routing updates
version Set routing protocol version
R5-PE2(config-router-af)#network
192.168.1.0
R5-PE2(config-router-af)#no
auto-summary
R5-PE2(config-router-af)#exit
R5-PE2(config-router)#exit
R5-PE2(config)#router bgp 65000
R5-PE2(config-router)#?
Router
configuration commands:
address-family Enter Address Family command mode
aggregate-address Configure BGP aggregate entries
auto-summary Enable automatic network number
summarization
bgp BGP specific commands
default Set a command to its defaults
default-information Control distribution of default information
default-metric Set metric of redistributed routes
distance Define an administrative distance
distribute-list Filter networks in routing updates
exit Exit from routing protocol
configuration mode
help Description of the
interactive help system
maximum-paths Forward packets over multiple paths
neighbor Specify a neighbor router
network Specify a network to announce
via BGP
no Negate a command or set its
defaults
redistribute Redistribute information from another
routing protocol
route-server-context Enter route server context command mode
scope Enter scope command mode
snmp Modify snmp parameters
synchronization Perform IGP synchronization
table-map Map external entry attributes into
routing table
template Enter template command mode
timers Adjust routing timers
R5-PE2(config-router)#address-family
?
ipv4
Address family
ipv6
Address family
l2vpn
Address family
nsap
Address family
rtfilter
Address family
vpnv4
Address family
vpnv6
Address family
R5-PE2(config-router)#address-family
ipv4 ?
mdt
Address Family modifier
multicast
Address Family modifier
mvpn
Address Family modifier
unicast
Address Family modifier
vrf
Specify parameters for a VPN Routing/Forwarding instance
<cr>
R5-PE2(config-router)#address-family ipv4 vrf CUSTB
R5-PE2(config-router-af)#?
Router
Address Family configuration commands:
aggregate-address Configure BGP aggregate entries
bgp BGP specific commands
default Set a command to its defaults
default-information Control distribution of default information
default-metric Set metric of redistributed routes
distance Define an administrative distance
distribute-list Filter networks in routing updates
exit-address-family Exit from Address Family configuration mode
help Description of the interactive
help system
import Configure path import
maximum-paths Forward packets over multiple paths
neighbor Specify a neighbor router
network Specify a network to announce via
BGP
no Negate a command or set its
defaults
redistribute Redistribute information from another
routing protocol
snmp Modify snmp parameters
synchronization Perform IGP synchronization
table-map Map external entry attributes into
routing table
R5-PE2(config-router-af)#neighbor 192.168.1.2 remote-as 65001 // EBGP PEERING WITH CUSTB-SITE2
R5-PE2(config-router-af)#exit
R5-PE2(config-router)#address-family vpnv4 // IBGP PEERING WITH R1-PE1
R5-PE2(config-router-af)#neighbor
10.1.1.1 ?
activate Enable the Address Family for
this Neighbor
advertise Advertise to this neighbor
advertisement-interval Minimum interval between sending BGP routing
updates
allowas-in Accept as-path with my AS present
in it
capability Advertise capability to the peer
distribute-list Filter updates to/from this neighbor
dmzlink-bw Propagate the DMZ link bandwidth
filter-list Establish BGP filters
inherit Inherit a template
inter-as-hybrid Inter AS Hybrid mode
maximum-prefix Maximum number of prefixes accepted
from this peer
next-hop-self Disable the next hop calculation for
this neighbor
next-hop-unchanged Propagate next hop unchanged for iBGP
paths to this
neighbor
prefix-list Filter updates to/from this
neighbor
remove-private-as Remove private AS number from outbound
updates
route-map Apply route map to neighbor
route-reflector-client Configure a neighbor as Route Reflector
client
send-community Send Community attribute to this
neighbor
slow-peer Configure slow-peer
soft-reconfiguration Per neighbor soft reconfiguration
soo Site-of-Origin extended
community
unsuppress-map Route-map to selectively unsuppress
suppressed routes
weight Set default weight for routes
from this neighbor
R5-PE2(config-router-af)#neighbor 10.1.1.1 next-hop-self
R5-PE2(config-router-af)#end
R5-PE2#
*Nov 26
14:49:14.133: %SYS-5-CONFIG_I: Configured from console by console
R5-PE2#clear
ip bgp 10.1.1.1 // CLEAR BGP PEER TO
REFLECT CHANGES
R5-PE2#
*Nov 26
14:49:32.405: %BGP-5-ADJCHANGE: neighbor 10.1.1.1 Down User reset
*Nov 26
14:49:32.405: %BGP_SESSION-5-ADJCHANGE: neighbor 10.1.1.1 VPNv4 Unicast
topology base removed from session User
reset
*Nov 26
14:49:32.409: %BGP_SESSION-5-ADJCHANGE: neighbor 10.1.1.1 IPv4 Unicast topology
base removed from session User reset
*Nov 26
14:49:32.869: %BGP-5-ADJCHANGE: neighbor 10.1.1.1 Up
3. Configure interface IP address and dynamic
routing protocol on CE Router (no VRF).
R6#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R6(config)#hostname
CUSTA-SITE1
CUSTA-SITE1(config)#interface
f1/0
CUSTA-SITE1(config-if)#ip
address 172.16.1.2 255.255.255.252
// IP ADDRESS IN GLOBAL ROUTING TABLE; NO NEED TO CONFIGURE VRF
CUSTA-SITE1(config-if)#no
shutdown
CUSTA-SITE1(config-if)#
*Nov 26
00:35:48.304: %LINK-3-UPDOWN: Interface FastEthernet1/0, changed state to up
*Nov 26
00:35:49.304: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0,
changed state to up
CUSTA-SITE1(config-if)#do
ping 172.16.1.1
Type
escape sequence to abort.
Sending
5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:
.!!!!
Success
rate is 80 percent (4/5), round-trip min/avg/max = 8/19/28 ms
CUSTA-SITE1(config-if)#
CUSTA-SITE1(config-if)#interface
loopback1
CUSTA-SITE1(config-if)#
*Nov 26
00:36:04.696: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1,
changed state to up
CUSTA-SITE1(config-if)#ip
address 172.16.1.99 255.255.255.255
CUSTA-SITE1(config-if)#exit
CUSTA-SITE1(config)#router
ospf 2 // NO NEED TO CONFIGURE UNDER
VRF
CUSTA-SITE1(config-router)#network
172.16.1.0 0.0.0.255 area 0
CUSTA-SITE1(config-router)#
*Nov 26 00:37:17.100: %OSPF-5-ADJCHG: Process 2, Nbr
172.16.1.1 on FastEthernet1/0 from LOADING to FULL, Loading Done
CUSTA-SITE1(config-router)#end
CUSTA-SITE1#
*Nov 26
00:37:33.388: %SYS-5-CONFIG_I: Configured from console by console
CUSTA-SITE1#
CUSTA-SITE1#show
ip ospf neighbor
Neighbor
ID Pri State Dead Time Address Interface
172.16.1.1
1 FULL/DR 00:00:36 172.16.1.1 FastEthernet1/0
R1-PE1#
*Nov 26 14:56:27.681: %OSPF-5-ADJCHG: Process 2, Nbr
172.16.1.99 on FastEthernet1/0 from LOADING to FULL, Loading Done
R1-PE1#show
ip route vrf CUSTA
Routing
Table: CUSTA
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
172.16.0.0/16 is variably subnetted, 3
subnets, 2 masks
C 172.16.1.0/30 is directly connected,
FastEthernet1/0
L 172.16.1.1/32 is directly connected,
FastEthernet1/0
O
172.16.1.99/32 [110/2] via 172.16.1.2, 00:03:00, FastEthernet1/0
R7#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R7(config)#hostname
CUSTB-SITE-1
CUSTB-SITE-1(config)#host
CUSTB-SITE1
CUSTB-SITE1(config)#interface
f1/1
CUSTB-SITE1(config-if)#ip
address 172.16.1.2 255.255.255.252
CUSTB-SITE1(config-if)#no
shutdown
CUSTB-SITE1(config-if)#
*Nov 26
00:41:56.068: %LINK-3-UPDOWN: Interface FastEthernet1/1, changed state to up
*Nov 26
00:41:57.068: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/1,
changed state to up
CUSTB-SITE1(config-if)#do
ping 172.16.1.1
Type
escape sequence to abort.
Sending
5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:
.!!!!
Success
rate is 80 percent (4/5), round-trip min/avg/max = 12/34/72 ms
CUSTB-SITE1(config-if)#
CUSTB-SITE1(config-if)#exit
CUSTB-SITE1(config)#interface
loopback1
CUSTB-SITE1(config-if)#
*Nov 26
00:42:32.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1,
changed state to up
CUSTB-SITE1(config-if)#ip
address 172.16.1.100 255.255.255.255
CUSTB-SITE1(config-if)#exit
CUSTB-SITE1(config)#router
eigrp 100
CUSTB-SITE1(config-router)#no
auto-summary
CUSTB-SITE1(config-router)#network
172.16.1.0 0.0.0.255
*Nov 26 00:43:21.440: %DUAL-5-NBRCHANGE: EIGRP-IPv4
100: Neighbor 172.16.1.1 (FastEthernet1/1) is up: new adjacency
CUSTB-SITE1(config-router)#end
CUSTB-SITE1#
*Nov 26
00:43:31.856: %SYS-5-CONFIG_I: Configured from console by console
CUSTB-SITE1#
CUSTB-SITE1#show
ip eigrp neighbor
EIGRP-IPv4
Neighbors for AS(100)
H Address Interface Hold Uptime SRTT
RTO Q Seq
(sec) (ms) Cnt Num
0
172.16.1.1 Fa1/1 12 00:00:16 25
150 0 3
R1-PE1#
*Nov 26 15:02:42.348: %DUAL-5-NBRCHANGE: EIGRP-IPv4
100: Neighbor 172.16.1.2 (FastEthernet1/1) is up: new adjacency
R1-PE1#
R1-PE1#show
ip route vrf CUSTB
Routing
Table: CUSTB
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
172.16.0.0/16 is variably subnetted, 3
subnets, 2 masks
C 172.16.1.0/30 is directly connected,
FastEthernet1/1
L 172.16.1.1/32 is directly connected,
FastEthernet1/1
D
172.16.1.100/32 [90/156160] via 172.16.1.2, 00:02:47, FastEthernet1/1
R8#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R8(config)#hostname
CUSTA-SITE2
CUSTA-SITE2(config)#interface
f1/0
CUSTA-SITE2(config-if)#ip
address 192.168.1.2 255.255.255.252
CUSTA-SITE2(config-if)#no
shutdown
CUSTA-SITE2(config-if)#
*Nov 26
00:48:21.616: %LINK-3-UPDOWN: Interface FastEthernet1/0, changed state to up
*Nov 26
00:48:22.616: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0,
changed state to up
CUSTA-SITE2(config-if)#do
ping 192.168.1.1
Type
escape sequence to abort.
Sending
5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
.!!!!
Success
rate is 80 percent (4/5), round-trip min/avg/max = 8/16/28 ms
CUSTA-SITE2(config-if)#interface
loopback1
CUSTA-SITE2(config-if)#
*Nov 26
00:48:38.236: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1,
changed state to up
CUSTA-SITE2(config-if)#ip
address 192.168.1.99 255.255.255.255
CUSTA-SITE2(config-if)#exit
CUSTA-SITE2(config)#router
rip
CUSTA-SITE2(config-router)#version
2
CUSTA-SITE2(config-router)#network
192.168.1.0
CUSTA-SITE2(config-router)#end
CUSTA-SITE2#
*Nov 26
00:49:20.204: %SYS-5-CONFIG_I: Configured from console by console
CUSTA-SITE2#
R5-PE2#show
ip route vrf CUSTA
Routing
Table: CUSTA
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
192.168.1.0/24 is variably subnetted, 3
subnets, 2 masks
C 192.168.1.0/30 is directly connected,
FastEthernet1/0
L 192.168.1.1/32 is directly connected,
FastEthernet1/0
R
192.168.1.99/32 [120/1] via 192.168.1.2, 00:00:03, FastEthernet1/0
R9#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R9(config)#hostname
CUSTB-SITE2
CUSTB-SITE2(config)#interface
f1/1
CUSTB-SITE2(config-if)#ip
address 192.168.1.2 255.255.255.252
CUSTB-SITE2(config-if)#no
shutdown
CUSTB-SITE2(config-if)#
*Nov 26
00:53:58.712: %LINK-3-UPDOWN: Interface FastEthernet1/1, changed state to up
CUSTB-SITE2(config-if)#
*Nov 26
00:53:59.712: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/1,
changed state to up
CUSTB-SITE2(config-if)#do
ping 192.168.1.1
Type
escape sequence to abort.
Sending
5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success
rate is 100 percent (5/5), round-trip min/avg/max = 8/15/24 ms
CUSTB-SITE2(config-if)#
CUSTB-SITE2(config-if)#interface
loopback1
*Nov 26
00:54:13.668: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1,
changed state to up
CUSTB-SITE2(config-if)#ip
address 192.168.1.100 255.255.255.255
CUSTB-SITE2(config-if)#exit
CUSTB-SITE2(config)#router
bgp 65001
CUSTB-SITE2(config-router)#neighbor
192.168.1.1 remote-as 65000
CUSTB-SITE2(config-router)#
*Nov 26 00:54:51.588: %BGP-5-ADJCHANGE: neighbor
192.168.1.1 Up
CUSTB-SITE2(config-router)#redistribute
connected
CUSTB-SITE2(config-router)#end
CUSTB-SITE2#
R5-PE2#
*Nov 26 15:14:51.480: %BGP-5-ADJCHANGE: neighbor
192.168.1.2 vpn vrf CUSTB Up
R5-PE2#
R5-PE2#show
ip route vrf CUSTB
Routing
Table: CUSTB
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
192.168.1.0/24 is variably subnetted, 3
subnets, 2 masks
C 192.168.1.0/30 is directly connected,
FastEthernet1/1
L 192.168.1.1/32 is directly connected,
FastEthernet1/1
B
192.168.1.100/32 [20/0] via 192.168.1.2, 00:01:22
4. Configure
Mutual Route Redistribution between PE Routers Dynamic Routing Protocol (OSPF,
EIGRP, RIPv2) and BGP (vpnv4).
R1-PE1#show
run | sec router bgp
router
bgp 65000
bgp log-neighbor-changes
neighbor 10.5.5.5 remote-as 65000
neighbor 10.5.5.5 update-source Loopback0
!
address-family vpnv4
neighbor 10.5.5.5 activate
neighbor 10.5.5.5 send-community extended
exit-address-family
R1-PE1#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R1-PE1(config)#router bgp 65000
R1-PE1(config-router)#address-family
ipv4 vrf CUSTA
R1-PE1(config-router-af)#?
Router
Address Family configuration commands:
aggregate-address Configure BGP aggregate entries
bgp BGP specific commands
default Set a command to its defaults
default-information Control distribution of default information
default-metric Set metric of redistributed routes
distance Define an administrative distance
distribute-list Filter networks in routing updates
exit-address-family Exit from Address Family configuration mode
help Description of the interactive
help system
import Configure path import
maximum-paths Forward packets over multiple paths
neighbor Specify a neighbor router
network Specify a network to announce via
BGP
no Negate a command or set its
defaults
redistribute Redistribute information from another
routing protocol
snmp Modify snmp parameters
synchronization Perform IGP synchronization
table-map Map external entry attributes into
routing table
R1-PE1(config-router-af)#redistribute
?
bgp
Border Gateway Protocol (BGP)
connected
Connected
eigrp
Enhanced Interior Gateway Routing Protocol (EIGRP)
isis
ISO IS-IS
lisp
Locator ID Separation Protocol (LISP)
mobile
Mobile routes
odr
On Demand stub Routes
ospf
Open Shortest Path First (OSPF)
ospfv3
OSPFv3
rip
Routing Information Protocol (RIP)
static
Static routes
R1-PE1(config-router-af)#redistribute
ospf ?
<1-65535> Process ID
R1-PE1(config-router-af)#redistribute
ospf 2 ?
match
Redistribution of OSPF routes
metric
Metric for redistributed routes
route-map
Route map reference
vrf
VPN Routing/Forwarding Instance
<cr>
R1-PE1(config-router-af)#redistribute
ospf 2 vrf ?
WORD
VPN Routing/Forwarding Instance (VRF) name
R1-PE1(config-router-af)#redistribute ospf 2 vrf CUSTA // EXPORT ROUTES FROM OSPF/VRF
INTO BGP
R1-PE1(config-router-af)#end
R1-PE1#
R1-PE1#show
ip bgp ?
A.B.C.D Network in the BGP routing table to
display
A.B.C.D/nn IP prefix
<network>/<length>, e.g., 35.0.0.0/8
all All address families
cidr-only Display only routes with non-natural
netmasks
community Display routes matching the
communities
community-list Display routes matching the community-list
dampening Display detailed information about
dampening
extcommunity-list Display routes matching the extcommunity-list
filter-list Display routes conforming to the
filter-list
import Display route topology import /
export activity
inconsistency Display all inconsistent paths
inconsistent-as Display only routes with inconsistent
origin ASs
injected-paths Display all injected paths
ipv4 Address family
ipv6 Address family
l2vpn Address family
labels Display Labels for IPv4 NLRI
specific information
neighbors Detailed information on TCP and BGP
neighbor connections
nexthops Nexthop address table
nsap Address family
oer-paths Display all oer controlled paths
paths Path information
peer-group Display information on peer-groups
pending-prefixes Display prefixes pending deletion
prefix-list Display routes matching the prefix-list
quote-regexp Display routes matching the AS path
"regular expression"
regexp Display routes matching the AS
path regular expression
replication Display replication status of
update-group(s)
rib-failure Display bgp routes that failed to
install in the routing
table (RIB)
route-map Display routes matching the route-map
route-server Route server information
rpki Display RPKI Neighbor Cache
rtfilter Address family
summary Summary of BGP neighbor status
template Display peer-policy/peer-session
templates
topology Routing topology instance
update-group Display information on update-groups
update-sources Update source interface table
va Display virtual aggregation
prefixes
version Display prefixes with matching
version numbers
vpnv4 Address family
vpnv6 Address family
| Output modifiers
<cr>
R1-PE1#show
ip bgp vpnv4 ?
all
Display information about all VPN NLRIs
rd
Display information for a route distinguisher
vrf
Display information for a VPN Routing/Forwarding instance
R1-PE1#show
ip bgp vpnv4 rd ?
ASN:nn or IP-address:nn VPN Route Distinguisher
R1-PE1#show
ip bgp vpnv4 rd 65000:1 ?
A.B.C.D Network in the BGP routing table to
display
A.B.C.D/nn IP prefix
<network>/<length>, e.g., 35.0.0.0/8
cidr-only Display only routes with non-natural
netmasks
community Display routes matching the
communities
community-list Display routes matching the community-list
dampening Display detailed information about
dampening
extcommunity-list Display routes matching the extcommunity-list
filter-list Display routes conforming to the
filter-list
inconsistency Display all inconsistent paths
inconsistent-as Display only routes with inconsistent
origin ASs
labels Display BGP labels for prefixes
neighbors Detailed information on TCP and BGP
neighbor connections
nexthops Nexthop address table
oer-paths Display all oer controlled paths
paths Path information
peer-group Display information on peer-groups
pending-prefixes Display prefixes pending deletion
prefix-list Display routes matching the prefix-list
quote-regexp Display routes matching the AS path
"regular expression"
regexp Display routes matching the AS
path regular expression
replication Display replication status of
update-group(s)
rib-failure Display bgp routes that failed to
install in the routing
table (RIB)
route-map Display routes matching the route-map
summary Summary of BGP neighbor status
update-group Display information on update-groups
version Display prefixes with matching
version numbers
| Output modifiers
<cr>
R1-PE1#show ip bgp vpnv4 rd 65000:1 labels // LEGACY SHOW COMMAND
Network Next Hop In label/Out label
Route
Distinguisher: 65000:1 (CUSTA)
172.16.1.0/30 0.0.0.0 107/nolabel(CUSTA)
172.16.1.99/32 172.16.1.2 108/nolabel
R1-PE1#show
bgp ?
*
All scopes
all
All address families
ipv4
Address family
ipv6
Address family
l2vpn
Address family
nsap
Address family
rtfilter
Address family
vpnv4
Address family
vpnv6
Address family
vrf
VRF scope
R1-PE1#show
bgp vpnv4 ?
multicast
Address Family Modifier
unicast
Address Family Modifier
R1-PE1#show
bgp vpnv4 unicast ?
all
Display information about all VPN NLRIs
rd
Display information for a route distinguisher
vrf
Display information for a VPN Routing/Forwarding instance
R1-PE1#show
bgp vpnv4 unicast rd ?
ASN:nn or IP-address:nn VPN Route Distinguisher
R1-PE1#show
bgp vpnv4 unicast rd 65000:1 ?
A.B.C.D Network in the BGP routing table to
display
A.B.C.D/nn IP prefix
<network>/<length>, e.g., 35.0.0.0/8
cidr-only Display only routes with non-natural
netmasks
community Display routes matching the
communities
community-list Display routes matching the community-list
dampening Display detailed information about
dampening
extcommunity-list Display routes matching the extcommunity-list
filter-list Display routes conforming to the
filter-list
inconsistency Display all inconsistent paths
inconsistent-as Display only routes with inconsistent
origin ASs
labels Display BGP labels for prefixes
neighbors Detailed information on TCP and BGP
neighbor connections
nexthops Nexthop address table
oer-paths Display all oer controlled paths
paths Path information
peer-group Display information on peer-groups
pending-prefixes Display prefixes pending deletion
prefix-list Display routes matching the prefix-list
quote-regexp Display routes matching the AS path
"regular expression"
regexp Display routes matching the AS
path regular expression
replication Display replication status of
update-group(s)
rib-failure Display bgp routes that failed to
install in the routing
table (RIB)
route-map Display routes matching the route-map
summary Summary of BGP neighbor status
update-group Display information on update-groups
version Display prefixes with matching
version numbers
| Output modifiers
<cr>
R1-PE1#show bgp vpnv4 unicast rd 65000:1 labels // "NEWER" SHOW COMMAND
Network Next Hop In label/Out label
Route
Distinguisher: 65000:1 (CUSTA)
172.16.1.0/30 0.0.0.0 107/nolabel(CUSTA)
172.16.1.99/32 172.16.1.2 108/nolabel
R1-PE1#show bgp vpnv4 unicast vrf CUSTA labels
Network Next Hop In label/Out label
Route
Distinguisher: 65000:1 (CUSTA)
172.16.1.0/30 0.0.0.0 107/nolabel(CUSTA)
172.16.1.99/32 172.16.1.2 108/nolabel
R1-PE1#show
mpls forwarding-table ?
A.B.C.D Destination prefix
X:X:X:X::X/<0-128> Destination IPv6 prefix
detail Detailed information
interface Match outgoing interface
labels Match label values
next-hop Match next hop neighbor
slot Specify the slot
vrf Show entries for a VPN
Routing/Forwarding instance
| Output modifiers
<cr>
R1-PE1#show mpls forwarding-table vrf CUSTA
Local Outgoing
Prefix Bytes Label Outgoing
Next Hop
Label Label
or Tunnel Id Switched interface
107 No Label 172.16.1.0/30[V]
0 aggregate/CUSTA // VPNv4 ROUTE
108 No Label 172.16.1.99/32[V] \
0 Fa1/0 172.16.1.2
R1-PE1#show ip cef vrf CUSTA 172.16.1.2/32
172.16.1.2/32
attached to FastEthernet1/0
R1-PE1#show bgp vpnv4 unicast vrf CUSTA
BGP table
version is 7, local router ID is 10.1.1.1
Status
codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m
multipath, b backup-path, f RT-Filter,
x best-external, a
additional-path, c RIB-compressed,
Origin
codes: i - IGP, e - EGP, ? - incomplete
RPKI
validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
Route
Distinguisher: 65000:1 (default for vrf CUSTA)
*>
172.16.1.0/30 0.0.0.0 0 32768 ? // NEXT-HOP OF 0.0.0.0 MEANS DIRECTLY
CONNECTED ROUTE
*>
172.16.1.99/32 172.16.1.2 2 32768 ?
R1-PE1#show
bgp vpnv4 unicast vrf CUSTA 172.16.1.99/32
BGP
routing table entry for 65000:1:172.16.1.99/32,
version 7 // RD
Paths: (1
available, best #1, table CUSTA)
Advertised to update-groups:
2
Refresh Epoch 1
Local
172.16.1.2 from 0.0.0.0 (10.1.1.1)
Origin incomplete, metric 2, localpref
100, weight 32768, valid, sourced, best
Extended
Community: RT:1:1 OSPF DOMAIN ID:0x0005:0x000000020200 // RT
OSPF RT:0.0.0.0:2:0 OSPF ROUTER
ID:172.16.1.1:0
mpls labels in/out 108/nolabel
R1-PE1#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R1-PE1(config)#router ospf 2 vrf CUSTA
R1-PE1(config-router)#?
Router
configuration commands:
area OSPF area parameters
auto-cost Calculate OSPF interface cost
according to bandwidth
bfd BFD configuration commands
capability Enable specific OSPF feature
compatible OSPF compatibility list
default Set a command to its defaults
default-information Control distribution of default information
default-metric Set metric of redistributed routes
discard-route Enable or disable discard-route
installation
distance Define an administrative
distance
distribute-list Filter networks in routing updates
domain-id OSPF domain-id
domain-tag OSPF domain-tag
event-log OSPF Event Logging
exit Exit from routing protocol
configuration mode
help Description of the
interactive help system
ignore Do not complain about specific
event
interface-id Source of the interface ID
ispf Enable incremental SPF
computation
limit Limit a specific OSPF feature
local-rib-criteria Enable or disable usage of local RIB as
route criteria
log-adjacency-changes Log changes in adjacency state
max-lsa maximum number of LSAs OSPF
process will receive
max-metric Set maximum metric
maximum-paths Forward packets over multiple paths
mpls Configure MPLS routing
protocol parameters
neighbor Specify a neighbor router
network Enable routing on an IP network
no Negate a command or set
its defaults
nsf Non-stop forwarding
passive-interface Suppress routing updates on an interface
prefix-suppression OSPF prefix suppression
priority OSPF topology priority
queue-depth OSPF Hello/Router process queue
depth
redistribute Redistribute information from
another routing protocol
router-id router-id for this OSPF process
shutdown Shutdown the OSPF protocol under
the current instance
snmp Modify snmp parameters
summary-address Configure IP address summaries
timers Adjust routing timers
traffic-share How to compute traffic share over
alternate paths
ttl-security TTL security check
R1-PE1(config-router)#redistribute
?
bgp Border Gateway Protocol (BGP)
connected Connected
eigrp Enhanced Interior Gateway Routing
Protocol (EIGRP)
isis ISO IS-IS
lisp Locator ID Separation Protocol
(LISP)
maximum-prefix Maximum number of prefixes redistributed to
protocol
mobile Mobile routes
odr On Demand stub Routes
ospf Open Shortest Path First (OSPF)
ospfv3 OSPFv3
rip Routing Information Protocol (RIP)
static Static routes
R1-PE1(config-router)#redistribute
bgp ?
<1-4294967295> Autonomous system number
<1.0-XX.YY> Autonomous system number
R1-PE1(config-router)#redistribute
bgp 65000 ?
metric
Metric for redistributed routes
metric-type
OSPF/IS-IS exterior metric type for redistributed routes
nssa-only
Limit redistributed routes to NSSA areas
route-map
Route map reference
subnets
Consider subnets for redistribution into OSPF
tag
Set tag for routes redistributed into OSPF
<cr>
R1-PE1(config-router)#redistribute bgp 65000 subnets // IMPORT ROUTES FROM BGP INTO OSPF/VRF
R1-PE1(config-router)#end
R1-PE1#
R1-PE1#show
run | sec router bgp
router
bgp 65000
bgp log-neighbor-changes
neighbor 10.5.5.5 remote-as 65000
neighbor 10.5.5.5 update-source Loopback0
!
address-family vpnv4
neighbor 10.5.5.5 activate
neighbor 10.5.5.5 send-community extended
exit-address-family
!
address-family ipv4 vrf CUSTA
redistribute ospf 2
exit-address-family
5. Configure
Route Redistribution for CUSTB
R1-PE1#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R1-PE1(config)#router bgp 65000
R1-PE1(config-router)#address-family
ipv4 vrf CUSTB
R1-PE1(config-router-af)#redistribute eigrp 100
R1-PE1(config-router-af)#end
R1-PE1#
*Nov 26
20:31:50.831: %SYS-5-CONFIG_I: Configured from console by console
R1-PE1#
R1-PE1#show
run | sec router bgp
router
bgp 65000
bgp log-neighbor-changes
neighbor 10.5.5.5 remote-as 65000
neighbor 10.5.5.5 update-source Loopback0
!
address-family vpnv4
neighbor 10.5.5.5 activate
neighbor 10.5.5.5 send-community extended
exit-address-family
!
address-family ipv4 vrf CUSTA
redistribute ospf 2
exit-address-family
!
address-family ipv4 vrf CUSTB
redistribute
eigrp 100
exit-address-family
R1-PE1#
R1-PE1#show bgp vpnv4 unicast vrf CUSTB
BGP table
version is 9, local router ID is 10.1.1.1
Status
codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m
multipath, b backup-path, f RT-Filter,
x best-external, a
additional-path, c RIB-compressed,
Origin
codes: i - IGP, e - EGP, ? - incomplete
RPKI
validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
Route
Distinguisher: 65000:2 (default for vrf CUSTB)
*>
172.16.1.0/30 0.0.0.0 0 32768 ?
*>
172.16.1.100/32 172.16.1.2 156160 32768 ?
*>i
192.168.1.0/30 10.5.5.5 0 100
0 65001 ? //
CUSTB-SITE2 ROUTES APPEARED SINCE EBGP WAS ALREADY CONFIGURED
*>i
192.168.1.100/32 10.5.5.5
0 100 0 65001 ?
R1-PE1#show bgp vpnv4 unicast vrf CUSTB labels
Network Next Hop In label/Out label
Route
Distinguisher: 65000:2 (CUSTB)
172.16.1.0/30 0.0.0.0 109/nolabel(CUSTB)
172.16.1.100/32 172.16.1.2 110/nolabel
192.168.1.0/30 10.5.5.5 nolabel/507
192.168.1.100/32 10.5.5.5 nolabel/508
R1-PE1#show mpls forwarding-table vrf CUSTB
Local Outgoing
Prefix Bytes Label Outgoing
Next Hop
Label Label
or Tunnel Id Switched interface
109 No Label 172.16.1.0/30[V] 0 aggregate/CUSTB
110 No Label 172.16.1.100/32[V] \
0 Fa1/1 172.16.1.2
R1-PE1#show ip cef vrf CUSTB 172.16.1.100
172.16.1.100/32
nexthop 172.16.1.2 FastEthernet1/1
CUSTB-SITE1#show
ip route
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
172.16.0.0/16 is variably subnetted, 3
subnets, 2 masks
C 172.16.1.0/30 is directly connected,
FastEthernet1/1
L 172.16.1.2/32 is directly connected,
FastEthernet1/1
C 172.16.1.100/32 is directly connected,
Loopback1
R1-PE1#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R1-PE1(config)#router eigrp 100
R1-PE1(config-router)#address-family
ipv4 vrf CUSTB autonomous-system 100
R1-PE1(config-router-af)#redistribute
?
bgp Border Gateway Protocol (BGP)
connected Connected
eigrp Enhanced Interior Gateway Routing
Protocol (EIGRP)
isis ISO IS-IS
maximum-prefix Maximum number of prefixes redistributed to
protocol
mobile Mobile routes
odr On Demand stub Routes
ospf Open Shortest Path First (OSPF)
ospfv3 OSPFv3
rip Routing Information Protocol (RIP)
static Static routes
R1-PE1(config-router-af)#redistribute
bgp ?
<1-4294967295> Autonomous system number
<1.0-XX.YY> Autonomous system number
R1-PE1(config-router-af)#redistribute
bgp 65000 ?
metric
Metric for redistributed routes
route-map
Route map reference
<cr>
R1-PE1(config-router-af)#redistribute
bgp 65000 metric ?
<1-4294967295> Bandwidth metric in Kbits per second
R1-PE1(config-router-af)#redistribute
bgp 65000 metric 1 ?
<0-4294967295> EIGRP delay metric, in 10 microsecond units
R1-PE1(config-router-af)#redistribute
bgp 65000 metric 1 1 ?
<0-255>
EIGRP reliability metric where 255 is 100% reliable
R1-PE1(config-router-af)#redistribute
bgp 65000 metric 1 1 1 ?
<1-255>
EIGRP Effective bandwidth metric (Loading) where 255 is 100% loaded
R1-PE1(config-router-af)#redistribute
bgp 65000 metric 1 1 1 1 ?
<1-65535> EIGRP MTU of the path
R1-PE1(config-router-af)#redistribute bgp 65000 metric 1 1 1 1 1 // IMPORT ROUTE
R1-PE1(config-router-af)#end
R1-PE1#
CUSTB-SITE1#show
ip route
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
172.16.0.0/16 is variably subnetted, 3
subnets, 2 masks
C 172.16.1.0/30 is directly connected,
FastEthernet1/1
L 172.16.1.2/32 is directly connected,
FastEthernet1/1
C 172.16.1.100/32 is directly connected,
Loopback1
192.168.1.0/24 is variably subnetted, 2
subnets, 2 masks
D EX
192.168.1.0/30
[170/2560002816] via 172.16.1.1, 00:00:06, FastEthernet1/1
D EX
192.168.1.100/32
[170/2560002816] via 172.16.1.1, 00:00:06, FastEthernet1/1
CUSTB-SITE1#traceroute
192.168.1.100
Type
escape sequence to abort.
Tracing
the route to 192.168.1.100
VRF info:
(vrf in name/id, vrf out name/id)
1 172.16.1.1 24 msec 16 msec 8 msec
2 10.12.0.2 [MPLS: Labels 205/508 Exp 0] 76
msec 40 msec 60 msec
3 10.23.0.3 [MPLS: Labels 309/508 Exp 0] 76
msec 84 msec 72 msec
4 10.34.0.4 [MPLS: Labels 405/508 Exp 0] 76
msec 72 msec 68 msec
5 192.168.1.1 [MPLS: Label 508 Exp 0] 84 msec
52 msec 60 msec
6 192.168.1.2 92 msec 72 msec 44 msec
R5-PE2#show
run | sec router bgp
router
bgp 65000
bgp log-neighbor-changes
neighbor 10.1.1.1 remote-as 65000
neighbor 10.1.1.1 update-source Loopback0
!
address-family vpnv4
neighbor 10.1.1.1 activate
neighbor 10.1.1.1 send-community extended
neighbor 10.1.1.1 next-hop-self
exit-address-family
!
address-family ipv4 vrf CUSTB
neighbor 192.168.1.2 remote-as 65001
neighbor 192.168.1.2 activate
exit-address-family
R5-PE2#
R5-PE2#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R5-PE2(config)#router bgp 65000
R5-PE2(config-router)#address-family
ipv4 vrf CUSTA
R5-PE2(config-router-af)#?
Router
Address Family configuration commands:
aggregate-address Configure BGP aggregate entries
bgp BGP specific commands
default Set a command to its defaults
default-information Control distribution of default information
default-metric Set metric of redistributed routes
distance Define an administrative distance
distribute-list Filter networks in routing updates
exit-address-family Exit from Address Family configuration mode
help Description of the interactive
help system
import Configure path import
maximum-paths Forward packets over multiple paths
neighbor Specify a neighbor router
network Specify a network to announce via
BGP
no Negate a command or set its
defaults
redistribute Redistribute information from another
routing protocol
snmp Modify snmp parameters
synchronization Perform IGP synchronization
table-map Map external entry attributes into
routing table
R5-PE2(config-router-af)#redistribute
?
bgp
Border Gateway Protocol (BGP)
connected
Connected
eigrp
Enhanced Interior Gateway Routing Protocol (EIGRP)
isis
ISO IS-IS
lisp
Locator ID Separation Protocol (LISP)
mobile
Mobile routes
odr
On Demand stub Routes
ospf
Open Shortest Path First (OSPF)
ospfv3
OSPFv3
rip
Routing Information Protocol (RIP)
static
Static routes
R5-PE2(config-router-af)#redistribute
rip ?
metric
Metric for redistributed routes
route-map
Route map reference
<cr>
R5-PE2(config-router-af)#redistribute rip // EXPORT ROUTES
R5-PE2(config-router-af)#end
R5-PE2#
R5-PE2#show bgp vpnv4 unicast vrf CUSTA labels
Network Next Hop In label/Out label
Route
Distinguisher: 65000:1 (CUSTA)
172.16.1.0/30 10.1.1.1 nolabel/107
172.16.1.99/32 10.1.1.1 nolabel/108
192.168.1.0/30 0.0.0.0 509/nolabel(CUSTA)
192.168.1.99/32 192.168.1.2 510/nolabel
CUSTA-SITE1#show
ip route
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
172.16.0.0/16 is variably subnetted, 3
subnets, 2 masks
C 172.16.1.0/30 is directly connected,
FastEthernet1/0
L 172.16.1.2/32 is directly connected,
FastEthernet1/0
C 172.16.1.99/32 is directly connected,
Loopback1
R5-PE2#configure
terminal
Enter
configuration commands, one per line.
End with CNTL/Z.
R5-PE2(config)#router rip
R5-PE2(config-router)#address-family
ipv4 vrf CUSTA
R5-PE2(config-router-af)#redistribute
bgp 65000 ?
metric
Metric for redistributed routes
route-map
Route map reference
<cr>
R5-PE2(config-router-af)#redistribute
bgp 65000 metric ?
<0-16> Default metric
transparent
Transparently redistribute metric
R5-PE2(config-router-af)#redistribute bgp 65000 metric 5 // IMPORT ROUTES
R5-PE2(config-router-af)#end
R5-PE2#
CUSTA-SITE2#show
ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES unset
administratively down down
FastEthernet1/0 192.168.1.2 YES manual up up
FastEthernet1/1 unassigned YES unset
administratively down down
Loopback1 192.168.1.99 YES manual up up
CUSTA-SITE2#show
ip route
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
172.16.0.0/16 is variably subnetted, 2
subnets, 2 masks
R
172.16.1.0/30 [120/5] via 192.168.1.1, 00:00:15, FastEthernet1/0
R
172.16.1.99/32 [120/5] via 192.168.1.1, 00:00:15, FastEthernet1/0
192.168.1.0/24 is variably subnetted, 3
subnets, 2 masks
C 192.168.1.0/30 is directly connected,
FastEthernet1/0
L 192.168.1.2/32 is directly connected,
FastEthernet1/0
C 192.168.1.99/32 is directly connected,
Loopback1
CUSTA-SITE1#show
ip route
Codes: L
- local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 -
OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF
external type 2
i - IS-IS, su - IS-IS summary, L1 -
IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate
default, U - per-user static route
o - ODR, P - periodic downloaded static
route, H - NHRP, l - LISP
+ - replicated route, % - next hop
override
Gateway
of last resort is not set
172.16.0.0/16 is variably subnetted, 3
subnets, 2 masks
C 172.16.1.0/30 is directly connected,
FastEthernet1/0
L 172.16.1.2/32 is directly connected,
FastEthernet1/0
C 172.16.1.99/32 is directly connected,
Loopback1
192.168.1.0/24 is variably subnetted, 2
subnets, 2 masks
O E2
192.168.1.0/30 [110/1] via 172.16.1.1, 00:06:35, FastEthernet1/0
O E2
192.168.1.99/32 [110/1] via 172.16.1.1, 00:06:35, FastEthernet1/0
CUSTA-SITE1#ping
192.168.1.99
Type
escape sequence to abort.
Sending
5, 100-byte ICMP Echos to 192.168.1.99, timeout is 2 seconds:
!!!!!
Success
rate is 100 percent (5/5), round-trip min/avg/max = 72/97/112 ms
CUSTA-SITE1#traceroute
192.168.1.99
Type
escape sequence to abort.
Tracing
the route to 192.168.1.99
VRF info:
(vrf in name/id, vrf out name/id)
1 172.16.1.1 8 msec 12 msec 12 msec
2 10.12.0.2 [MPLS: Labels 205/510 Exp 0] 72
msec 96 msec 84 msec
3 10.23.0.3 [MPLS: Labels 309/510 Exp 0] 44
msec 92 msec 76 msec
4 10.34.0.4 [MPLS: Labels 405/510 Exp 0] 72
msec 52 msec 100 msec
5 192.168.1.1 [MPLS: Label 510 Exp 0] 80 msec
56 msec 96 msec
6 192.168.1.2 112 msec 88 msec 92 msec
