My Network Lab: Configuring EIGRP Stub Routing

EIGRP defines stub routers as follows: A stub router is a router that should not forward traffic between two remote EIGRP learned subnets.

To accomplish this goal, the engineer configures the stub routers using the eigrp stub command. Stub routers do not advertise EIGRP-learned routes from one neighbor to other EIGRP neighbors. Additionally, and possibly more significantly, nonstub routers note which EIGRP neighbors are stub routers, and the nonstub routers do not send Query messages to the stub routers. This action greatly reduces the scope of Query messages when a route goes active, in addition to preventing the long, circuitous, and possibly harmful route.

The eigrp stub command has several options. When issued simply as eigrp stub , the router uses default parameters, which are the connected and summary options. (Note that Cisco IOS adds these two parameters onto the command as added to the running config.)

Note that stub routers still form neighborships, even in receive-only mode. The stub router simply performs less work and reduces the Query scope because neighbors will not send these routers any Query messages.

Below lists the eigrp stub command options:

* connected: Advertise connected routes but only for interfaces matched with a
network command.

* summary: Advertise auto-summarized or statically configured summary routes.

* static: Advertise static routes, assuming that the redistribute static command is
configured.

* leak-map <name>: Advertise routes (that redistributed Advertise redistributed routes, assuming that redistribution is configured.

* receive-only: Does not advertise any routes. This option cannot be used with any other
option

R1#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R1(config)#interface loop0

R1(config-if)#

*Jun 24 08:30:13.423: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

R1(config-if)#ip address 10.1.1.1 255.255.255.0

R1(config-if)#

R1(config-if)#interface serial 2/0

R1(config-if)#ip address 10.2.2.1 255.255.255.252

R1(config-if)#no shut

R1(config-if)#

*Jun 24 08:30:35.843: %LINK-3-UPDOWN: Interface Serial2/0, changed state to up

*Jun 24 08:30:36.859: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/0, changed state to up

R1(config-if)#end

R1#

R2#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R2(config)#interface loop0

R2(config-if)#

*Jun 24 08:31:17.199: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

R2(config-if)#ip address 10.3.3.1 255.255.255.0

R2(config-if)#

R2(config-if)#interface loop1

R2(config-if)#

*Jun 24 08:31:41.811: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

R2(config-if)#ip address 192.168.1.1 255.255.255.252

R2(config-if)#

R2(config-if)#interface loop2

R2(config-if)#

*Jun 24 08:32:04.427: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback2, changed state to up

R2(config-if)#ip address 192.168.2.1 255.255.255.252

R2(config-if)#

R2(config-if)#interface loop3

R2(config-if)#

*Jun 24 08:32:13.887: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback3, changed state to up

R2(config-if)#ip address 192.168.3.1 255.255.255.252

R2(config-if)#

R2(config-if)#interface loop4

R2(config-if)#

*Jun 24 08:32:28.203: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback4, changed state to up

R2(config-if)#ip address 192.168.4.1 255.255.255.252

R2(config-if)#

R2(config-if)#interface serial 2/0

R2(config-if)#ip address 10.2.2.2 255.255.255.252

R2(config-if)#no shut

R2(config-if)#

*Jun 24 08:32:59.463: %LINK-3-UPDOWN: Interface Serial2/0, changed state to up

R2(config-if)#

*Jun 24 08:33:00.471: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/0, changed state to up

R2(config-if)#do ping 10.2.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.2.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/24/32 ms

R2(config-if)#

R2(config-if)#interface serial 2/1

R2(config-if)#ip address 10.4.4.1 255.255.255.252

R2(config-if)#no shut

R2(config-if)#

*Jun 24 08:33:42.975: %LINK-3-UPDOWN: Interface Serial2/1, changed state to up

R2(config-if)#

*Jun 24 08:33:43.983: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to up

R2(config-if)#end

R2#

R3#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R3(config)#interface loop0

R3(config-if)#

*Jun 24 08:34:19.135: %LINK-3-UPDOWN: Interface Loopback0, changed state to up

*Jun 24 08:34:20.135: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

R3(config-if)#ip address 10.1.5.1 255.255.255.0

R3(config-if)#

R3(config-if)#interface serial 2/1

R3(config-if)#ip address 10.4.4.2 255.255.255.252

R3(config-if)#no shut

R3(config-if)#

*Jun 24 08:34:56.379: %LINK-3-UPDOWN: Interface Serial2/1, changed state to up

R3(config-if)#

*Jun 24 08:34:57.387: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to up

R3(config-if)#do ping 10.4.4.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.4.4.1, timeout is 2 seconds:

.!!!!

Success rate is 80 percent (4/5), round-trip min/avg/max = 20/27/36 ms

R3(config-if)#end

R3#

R1#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 unassigned YES unset administratively down down

FastEthernet1/0 unassigned YES unset administratively down down

FastEthernet1/1 unassigned YES unset administratively down down

Serial2/0 10.2.2.1 YES manual up up

Serial2/1 unassigned YES unset administratively down down

Serial2/2 unassigned YES unset administratively down down

Serial2/3 unassigned YES unset administratively down down

Loopback0 10.1.1.1 YES manual up up

R2#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 unassigned YES unset administratively down down

FastEthernet1/0 unassigned YES unset administratively down down

FastEthernet1/1 unassigned YES unset administratively down down

Serial2/0 10.2.2.2 YES manual up up

Serial2/1 10.4.4.1 YES manual up up

Serial2/2 unassigned YES unset administratively down down

Serial2/3 unassigned YES unset administratively down down

Loopback0 10.3.3.1 YES manual up up

Loopback1 192.168.1.1 YES manual up up

Loopback2 192.168.2.1 YES manual up up

Loopback3 192.168.3.1 YES manual up up

Loopback4 192.168.4.1 YES manual up up

R3#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 unassigned YES unset administratively down down

FastEthernet1/0 unassigned YES unset administratively down down

FastEthernet1/1 unassigned YES unset administratively down down

Serial2/0 unassigned YES manual administratively down down

Serial2/1 10.4.4.2 YES manual up up

Serial2/2 unassigned YES unset administratively down down

Serial2/3 unassigned YES unset administratively down down

Loopback0 10.1.5.1 YES manual up up

R1#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R1(config)#router eigrp 100

R1(config-router)#network 10.0.0.0

R2#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R2(config)#router eigrp 100

R2(config-router)#network 10.0.0.0

R2(config-router)#

*Jun 24 08:38:31.183: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is up: new adjacency

R2(config-router)#network 192.168.0.0 0.0.255.255

R1#show ip eigrp neighbors

EIGRP-IPv4 Neighbors for AS(100)

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 10.2.2.2 Se2/0 13 00:01:05 52 312 0 4

R1#show ip route eigrp

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

10.0.0.0/8 is variably subnetted, 6 subnets, 3 masks

D 10.3.3.0/24 [90/2297856] via 10.2.2.2, 00:01:11, Serial2/0

D 10.4.4.0/30 [90/2681856] via 10.2.2.2, 00:01:11, Serial2/0

192.168.1.0/30 is subnetted, 1 subnets

D 192.168.1.0 [90/2297856] via 10.2.2.2, 00:00:53, Serial2/0

192.168.2.0/30 is subnetted, 1 subnets

D 192.168.2.0 [90/2297856] via 10.2.2.2, 00:00:53, Serial2/0

192.168.3.0/30 is subnetted, 1 subnets

D 192.168.3.0 [90/2297856] via 10.2.2.2, 00:00:53, Serial2/0

192.168.4.0/30 is subnetted, 1 subnets

D 192.168.4.0 [90/2297856] via 10.2.2.2, 00:00:53, Serial2/0

R2#conf t

*Jun 24 08:40:20.679: %SYS-5-CONFIG_I: Configured from console by console

R2#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R2(config)#interface serial 2/0

R2(config-if)#ip summary-address ?

eigrp Enhanced Interior Gateway Routing Protocol (EIGRP)

rip Routing Information Protocol (RIP)

R2(config-if)#ip summary-address eigrp ?

<1-65535> AS number

R2(config-if)#ip summary-address eigrp 100 ?

A.B.C.D Summary IP address

A.B.C.D/nn Summary <network>/<length>, e.g. 192.168.0.0/16

R2(config-if)#ip summary-address eigrp 100 192.168.0.0 255.255.248.0

R2(config-if)#

*Jun 24 08:41:23.251: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is resync: summary configured

R2(config-if)#

R2(config-if)#ip route 10.1.5.0 255.255.255.0 10.4.4.2

R2(config)#do ping 10.1.5.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.5.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/28/68 ms

R2#show ip eigrp neighbors

EIGRP-IPv4 Neighbors for AS(100)

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 10.2.2.1 Se2/0 11 00:05:46 52 312 0 7

R1#

*Jun 24 08:41:23.891: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.2 (Serial2/0) is resync: peer graceful-restart

R1#

R1#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

10.0.0.0/8 is variably subnetted, 6 subnets, 3 masks

C 10.1.1.0/24 is directly connected, Loopback0

L 10.1.1.1/32 is directly connected, Loopback0

C 10.2.2.0/30 is directly connected, Serial2/0

L 10.2.2.1/32 is directly connected, Serial2/0

D 10.3.3.0/24 [90/2297856] via 10.2.2.2, 00:07:26, Serial2/0

D 10.4.4.0/30 [90/2681856] via 10.2.2.2, 00:07:26, Serial2/0

D 192.168.0.0/21 [90/2297856] via 10.2.2.2, 00:04:34, Serial2/0

R1#

R1#ping 10.1.5.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.5.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R3#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R3(config)#ip route 0.0.0.0 0.0.0.0 10.4.4.1

R3(config)#do ping 10.3.3.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.3.3.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/19/24 ms

R2#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R2(config)#router eigrp 100

R2(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

R2(config-router)#eigrp ?

event-log-size Set EIGRP maximum event log entries

log-neighbor-changes Enable/Disable EIGRP neighbor logging

log-neighbor-warnings Enable/Disable EIGRP neighbor warnings

router-id router id for this EIGRP process

stub Set address-family in stubbed mode

R2(config-router)#eigrp stub ?

connected Do advertise connected routes

leak-map Allow dynamic prefixes based on the leak-map

receive-only Set receive only neighbor

redistributed Do advertise redistributed routes

static Do advertise static routes

summary Do advertise summary routes

<cr>

R2(config-router)#eigrp stub

R2(config-router)#

*Jun 24 08:49:54.571: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is down: peer info changed

*Jun 24 08:49:54.875: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is up: new adjacency

R2(config-router)#do show run | sec eigrp

ip summary-address eigrp 100 192.168.0.0 255.255.248.0

router eigrp 100

network 10.0.0.0

network 192.168.0.0 0.0.255.255

eigrp stub connected summary

R1#show ip route eigrp

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

10.0.0.0/8 is variably subnetted, 6 subnets, 3 masks

D 10.3.3.0/24 [90/2297856] via 10.2.2.2, 00:01:24, Serial2/0

D 10.4.4.0/30 [90/2681856] via 10.2.2.2, 00:01:24, Serial2/0

D 192.168.0.0/21 [90/2297856] via 10.2.2.2, 00:01:24, Serial2/0

R1#show ip eigrp neighbors ?

Async Async interface

Auto-Template Auto-Template interface

BVI Bridge-Group Virtual Interface

CDMA-Ix CDMA Ix interface

CTunnel CTunnel interface

Dialer Dialer interface

FastEthernet FastEthernet IEEE 802.3

GMPLS MPLS interface

LISP Locator/ID Separation Protocol Virtual Interface

LongReachEthernet Long-Reach Ethernet interface

Loopback Loopback interface

MFR Multilink Frame Relay bundle interface

Multilink Multilink-group interface

Null Null interface

Port-channel Ethernet Channel of interfaces

Serial Serial

Tunnel Tunnel interface

Vif PGM Multicast Host interface

Virtual-PPP Virtual PPP interface

Virtual-Template Virtual Template interface

Virtual-TokenRing Virtual TokenRing

detail Show detailed peer information

static Show static peer information

vmi Virtual Multipoint Interface

| Output modifiers

<cr>

R1#show ip eigrp neighbors detail

EIGRP-IPv4 Neighbors for AS(100)

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 10.2.2.2 Se2/0 13 00:02:37 15 150 0 9

Version 10.0/2.0, Retrans: 1, Retries: 0, Prefixes: 3

Topology-ids from peer - 0

Stub Peer Advertising (CONNECTED SUMMARY ) Routes

Suppressing queries

R2(config)#router eigrp 100

R2(config-router)#redistribute static

R2(config-router)#eigrp stub static

R2(config-router)#

*Jun 24 08:53:32.747: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is down: peer info changed

R2(config-router)#

*Jun 24 08:53:35.471: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is up: new adjacency

R2(config-router)#do show run | sec eigrp

ip summary-address eigrp 100 192.168.0.0 255.255.248.0

router eigrp 100

network 10.0.0.0

network 192.168.0.0 0.0.255.255

redistribute static

eigrp stub static

*Jun 24 08:53:35.951: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.2 (Serial2/0) is up: new adjacency

R1#

R1#show ip route eigrp

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

10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks

D EX 10.1.5.0/24 [170/2681856] via 10.2.2.2, 00:00:51, Serial2/0

R1#show ip eigrp neighbors detail

EIGRP-IPv4 Neighbors for AS(100)

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 10.2.2.2 Se2/0 13 00:01:28 30 180 0 13

Version 10.0/2.0, Retrans: 0, Retries: 0, Prefixes: 1

Topology-ids from peer - 0

Stub Peer Advertising (STATIC ) Routes

Suppressing queries

R1#ping 10.1.5.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.5.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/48/72 ms

R1#traceroute 10.1.5.1

Type escape sequence to abort.

Tracing the route to 10.1.5.1

VRF info: (vrf in name/id, vrf out name/id)

1 10.2.2.2 28 msec 16 msec 20 msec

2 10.4.4.2 28 msec 52 msec 12 msec

R2(config)#router eigrp 100

R2(config-router)#eigrp stub ?

connected Do advertise connected routes

leak-map Allow dynamic prefixes based on the leak-map

receive-only Set receive only neighbor

redistributed Do advertise redistributed routes

static Do advertise static routes

summary Do advertise summary routes

<cr>

R2(config-router)#eigrp stub connected summary static

R2(config-router)#

*Jun 24 08:56:10.931: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is down: peer info changed

R2(config-router)#

*Jun 24 08:56:12.355: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is up: new adjacency

R2(config-router)#do show run | sec eigrp

ip summary-address eigrp 100 192.168.0.0 255.255.248.0

router eigrp 100

network 10.0.0.0

network 192.168.0.0 0.0.255.255

redistribute static

eigrp stub connected static summary

*Jun 24 08:56:12.839: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.2 (Serial2/0) is up: new adjacency

R1#

R1#show ip route eigrp

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

10.0.0.0/8 is variably subnetted, 7 subnets, 3 masks

D EX 10.1.5.0/24 [170/2681856] via 10.2.2.2, 00:00:35, Serial2/0

D 10.3.3.0/24 [90/2297856] via 10.2.2.2, 00:00:35, Serial2/0

D 10.4.4.0/30 [90/2681856] via 10.2.2.2, 00:00:35, Serial2/0

D 192.168.0.0/21 [90/2297856] via 10.2.2.2, 00:00:35, Serial2/0

R1#show ip eigrp neighbor detail

EIGRP-IPv4 Neighbors for AS(100)

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 10.2.2.2 Se2/0 11 00:00:54 47 282 0 16

Version 10.0/2.0, Retrans: 0, Retries: 0, Prefixes: 4

Topology-ids from peer - 0

Stub Peer Advertising (CONNECTED STATIC SUMMARY ) Routes

Suppressing queries

R1#ping 10.3.3.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.3.3.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/16/20 ms

R1#ping 10.1.5.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.5.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/21/28 ms

R3#ping 10.1.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/33/60 ms

R2(config)#router eigrp 100

R2(config-router)#eigrp stub ?

connected Do advertise connected routes

leak-map Allow dynamic prefixes based on the leak-map

receive-only Set receive only neighbor

redistributed Do advertise redistributed routes

static Do advertise static routes

summary Do advertise summary routes

<cr>

R2(config-router)#eigrp stub receive-only

R2(config-router)#

*Jun 24 08:59:20.407: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is down: peer info changed

R2(config-router)#

*Jun 24 08:59:22.459: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.1 (Serial2/0) is up: new adjacency

*Jun 24 08:59:22.955: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 10.2.2.2 (Serial2/0) is up: new adjacency

R1#

R1#show ip route eigrp

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

R1#

R1#show ip eigrp neighbor detail

EIGRP-IPv4 Neighbors for AS(100)

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 10.2.2.2 Se2/0 14 00:00:47 44 264 0 18

Version 10.0/2.0, Retrans: 0, Retries: 0

Topology-ids from peer - 0

Receive-Only Peer Advertising (No) Routes

Suppressing queries

My Network Lab

Saturday, September 1, 2018

Configuring EIGRP Stub Routing

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