My Network Lab: Configuring Path Control via IP SLA Tracking

The following list summarizes available IP SLA operation types:
* ICMP (echo, jitter)
* RTP (VoIP)
* TCP connection
* UDP (echo, jitter)
* DNS
* DHCP
* HTTP
* FTP

The general steps to configure an ICMP-based IP SLA operation are as follows:

Step 1: Create the IP SLA operation and assign it an integer operation number, using the ip sla <sla ops-number> global configuration command.

Step 2: Define the operation type and the parameters for that operation type. For ICMP echo, you define the destination IP address or host name, and optionally, the source IP address or host name, using the icmp-echo { destination-ipaddress | destination-hostname } [ source-ip { ip-address | hostname } | source-interface <interface-name> ] SLA operation subcommand.

Step 3: (Optional) Define a (non-default) frequency at which the operation should send the packets, in seconds, using the frequency <seconds> IP SLA sub-command.

Step 4: Schedule when the SLA will run, using the ip sla schedule <sla-ops-number> [ life { forever | seconds }] [ start-time { hh : mm [ : ss ] [ month day | day month ] |pending | now | after hh : mm : ss }] [ ageout seconds ] [ recurring ] global command.

R1#conf t

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

R1(config)#interface loop 0

R1(config-if)#

*Jul 10 10:13:34.615: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

R1(config-if)#ip address 192.168.1.1 255.255.255.0

R1(config-if)#

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

R1(config-if)#description ### ISP 1 ###

R1(config-if)#ip address 209.165.201.2 255.255.255.252

R1(config-if)#bandwidth 128

R1(config-if)#no shut

*Jul 10 10:14:52.911: %LINK-3-UPDOWN: Interface Serial2/0, changed state to up

R1(config-if)#

*Jul 10 10:14:53.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/0, changed state to up

R1(config-if)#

R1(config-if)#interface serial 2/3

R1(config-if)#description ### ISP 2 ###

R1(config-if)#ip address 209.165.202.130 255.255.255.252

R1(config-if)#bandwidth 128

R1(config-if)#no shut

*Jul 10 10:15:09.603: %LINK-3-UPDOWN: Interface Serial2/3, changed state to up

R1(config-if)#

*Jul 10 10:15:10.611: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/3, changed state to up

R1(config-if)#end

R1#

R2#conf t

R2(config)#hostname ISP1

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

ISP1(config)#interface loop 0

ISP1(config-if)#

*Jul 10 10:17:01.027: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

ISP1(config-if)#description ### INTERNET WEB SERVER ###

ISP1(config-if)#ip address 209.165.200.254 255.255.255.255

ISP1(config-if)#

ISP1(config-if)#interface loop 1

ISP1(config-if)#

*Jul 10 10:17:36.167: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

ISP1(config-if)#description ### ISP1 DNS SERVER ###

ISP1(config-if)#ip address 209.165.201.30 255.255.255.255

ISP1(config-if)#

ISP1(config-if)#interface serial 2/0

ISP1(config-if)#description ### R1 ####

ISP1(config-if)#ip address 209.165.201.1 255.255.255.252

ISP1(config-if)#bandwidth 128

ISP1(config-if)#no shut

ISP1(config-if)#

*Jul 10 10:18:42.263: %LINK-3-UPDOWN: Interface Serial2/0, changed state to up

ISP1(config-if)#

*Jul 10 10:18:43.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/0, changed state to up

ISP1(config-if)#

ISP1(config-if)#do ping 209.165.201.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 209.165.201.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/20/24 ms

ISP1(config-if)#

ISP1(config-if)#interface serial 2/1

ISP1(config-if)#description ### ISP 2 ###

ISP1(config-if)#ip address 209.165.200.225 255.255.255.252

ISP1(config-if)#bandwidth 128

ISP1(config-if)#no shut

ISP1(config-if)#

*Jul 10 10:19:48.787: %LINK-3-UPDOWN: Interface Serial2/1, changed state to up

ISP1(config-if)#

*Jul 10 10:19:49.795: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to up

ISP1(config-if)#end

ISP1#

R3#conf t

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

R3(config-if)#hostname ISP2

ISP2(config)#interface loop 0

ISP2(config-if)#

*Jul 10 10:18:11.047: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up

ISP2(config-if)#description ### INTERNET WEB SERVER ###

ISP2(config-if)#ip address 209.165.200.254 255.255.255.255

ISP2(config-if)#

ISP2(config)#interface loop 1

ISP2(config-if)#

*Jul 10 10:20:00.983: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

ISP2(config-if)#description ### ISP2 DNS SERVER ###

ISP2(config-if)#ip address 209.165.202.158 255.255.255.255

ISP2(config-if)#

ISP2(config)#interface serial 2/3

ISP2(config-if)#description ### R1 ###

ISP2(config-if)#ip address 209.165.202.129 255.255.255.252

ISP2(config-if)#no shut

ISP2(config-if)#

*Jul 10 10:21:18.899: %LINK-3-UPDOWN: Interface Serial2/3, changed state to up

ISP2(config-if)#

*Jul 10 10:21:19.907: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/3, changed state to up

ISP2(config-if)#do ping 209.165.202.130

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 209.165.202.130, timeout is 2 seconds:

!!!!!

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

ISP2(config-if)#

ISP2(config-if)#bandwidth 128

ISP2(config-if)#

ISP2(config-if)#interface serial 2/1

ISP2(config-if)#description ### ISP 1 ###

ISP2(config-if)#ip address 209.165.200.226 255.255.255.252

ISP2(config-if)#bandwidth 128

ISP2(config-if)#no shut

ISP2(config-if)#

*Jul 10 10:22:15.387: %LINK-3-UPDOWN: Interface Serial2/1, changed state to up

ISP2(config-if)#

*Jul 10 10:22:16.399: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to up

ISP2(config-if)#

ISP2(config-if)#do ping 209.165.200.225

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 209.165.200.225, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/20/32 ms

ISP2(config-if)#end

ISP2#

R1#show interface description | inc up

Se2/0 up up ### ISP 1 ###

Se2/3 up up ### ISP 2 ###

Lo0 up up

ISP1#show interface description | inc up

Se2/0 up up ### R1 ####

Se2/1 up up ### ISP 2 ###

Lo0 up up ### INTERNET WEB SERVER ###

Lo1 up up ### ISP1 DNS SERVER ###

ISP2#show interface description | exc down

Interface Status Protocol Description

Se2/1 up up ### ISP 1 ###

Se2/3 up up ### R1 ###

Lo0 up up ### INTERNET WEB SERVER ###

Lo1 up up ### ISP2 DNS SERVER ###

R1#conf t

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

R1(config)#ip route 0.0.0.0 0.0.0.0 209.165.201.1

R1(config)#end

R1#

ISP1#conf t

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

ISP1(config)#router eigrp 1

ISP1(config-router)#network 209.165.200.224 0.0.0.3

ISP1(config-router)#network 209.165.201.0 0.0.0.31

ISP1(config-router)#no auto-summary

ISP1(config-router)#exit

ISP1(config)#ip route 192.168.1.0 255.255.255.0 209.165.201.2

ISP1(config)#end

ISP1#

*Jul 10 10:38:55.691: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 209.165.200.226 (Serial2/1) is up: new adjacency

ISP2#conf t

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

ISP2(config)#router eigrp 1

ISP2(config-router)#network 209.165.200.224 0.0.0.3

ISP2(config-router)#

*Jul 10 10:36:16.343: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 209.165.200.225 (Serial2/1) is up: new adjacency

ISP2(config-router)#network 209.165.202.128 0.0.0.31

ISP2(config-router)#exit

ISP2(config)#ip route 192.168.1.0 255.255.255.0 209.165.202.130

ISP2(config)#end

ISP2#

R1#tclsh

R1(tcl)#foreach address {

+>(tcl)#209.165.200.254

+>(tcl)#209.165.201.30

+>(tcl)#209.165.202.158

+>(tcl)#} {

+>(tcl)#ping $address source 192.168.1.1

+>(tcl)#}

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 209.165.200.254, timeout is 2 seconds:

Packet sent with a source address of 192.168.1.1

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/16/24 ms

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 209.165.201.30, timeout is 2 seconds:

Packet sent with a source address of 192.168.1.1

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/9/12 ms

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 209.165.202.158, timeout is 2 seconds:

Packet sent with a source address of 192.168.1.1

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 8/16/20 ms

R1#tclsh // ROUTING VIA ISP1 HOP

R1(tcl)#foreach address {

+>(tcl)#209.165.200.254

+>(tcl)#209.165.201.30

+>(tcl)#209.165.202.158

+>(tcl)#} {

+>(tcl)#trace $address source 192.168.1.1

+>(tcl)#}

Type escape sequence to abort.

Tracing the route to 209.165.200.254

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

1 209.165.201.1 20 msec 36 msec 16 msec

Type escape sequence to abort.

Tracing the route to 209.165.201.30

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

1 209.165.201.1 4 msec 20 msec 20 msec

Type escape sequence to abort.

Tracing the route to 209.165.202.158

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

1 209.165.201.1 8 msec 20 msec 20 msec

2 209.165.200.226 24 msec 28 msec 16 msec

R1#conf t // CONFIGURE IP SLA TO MONITOR ISP REACHABILITY; PROBES CAN BE ICMP, FTP, HTTP AND JITTER; ROUTER CPU AND LINK UTILIZATION SHOULD BE CONSIDERED AND MONITORED

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

R1(config)#ip sla ?

<1-2147483647> Entry Number

auto IP SLAs Auto Configuration

enable Enable IPSLA features

endpoint-list Endpoint list configuration

ethernet-monitor IP SLAs Auto Ethernet Configuration

group Group Configuration or Group Scheduling

key-chain Use MD5 Authentication for IP SLAs Control Messages

logging Enable Syslog

low-memory Configure Low Water Memory Mark

reaction-configuration IP SLAs Reaction-Configuration

reaction-trigger IP SLAs Trigger Assignment

reset IP SLAs Reset

responder Enable IP SLAs Responder

restart Restart An Active Entry

schedule Entry Scheduling

server IPPM server configuration

R1(config)#ip sla 11

R1(config-ip-sla)#?

IP SLAs entry configuration commands:

dhcp DHCP Operation

dns DNS Query Operation

ethernet Ethernet Operations

exit Exit Operation Configuration

ftp FTP Operation

http HTTP Operation

icmp-echo ICMP Echo Operation

icmp-jitter ICMP Jitter Operation

mpls MPLS Operation

path-echo Path Discovered ICMP Echo Operation

path-jitter Path Discovered ICMP Jitter Operation

tcp-connect TCP Connect Operation

udp-echo UDP Echo Operation

udp-jitter UDP Jitter Operation

voip Voice Over IP Operation

R1(config-ip-sla)#icmp-echo ?

Hostname or A.B.C.D Destination IP address or hostname, broadcast disallowed

R1(config-ip-sla)#icmp-echo 209.165.201.30 // ICMP ECHO PROBE

R1(config-ip-sla-echo)#frequency ?

<1-604800> Frequency in seconds

R1(config-ip-sla-echo)#frequency 10

R1(config-ip-sla-echo)#exit

R1(config)#ip sla ?

<1-2147483647> Entry Number

auto IP SLAs Auto Configuration

enable Enable IPSLA features

endpoint-list Endpoint list configuration

ethernet-monitor IP SLAs Auto Ethernet Configuration

group Group Configuration or Group Scheduling

key-chain Use MD5 Authentication for IP SLAs Control Messages

logging Enable Syslog

low-memory Configure Low Water Memory Mark

reaction-configuration IP SLAs Reaction-Configuration

reaction-trigger IP SLAs Trigger Assignment

reset IP SLAs Reset

responder Enable IP SLAs Responder

restart Restart An Active Entry

schedule Entry Scheduling

server IPPM server configuration

R1(config)#ip sla schedule ?

<1-2147483647> Entry number

R1(config)#ip sla schedule 11 ?

ageout How long to keep this Entry when inactive

life Length of time to execute in seconds

recurring Probe to be scheduled automatically every day

start-time When to start this entry

<cr>

R1(config)#ip sla schedule 11 life ?

<0-2147483647> Life seconds (default 3600)

forever continue running forever

R1(config)#ip sla schedule 11 life forever ?

ageout How long to keep this Entry when inactive

recurring Probe to be scheduled automatically every day

start-time When to start this entry

<cr>

R1(config)#ip sla schedule 11 life forever start-time ?

after Start after a certain amount of time from now

hh:mm Start time (hh:mm)

hh:mm:ss Start time (hh:mm:ss)

now Start now

pending Start pending

R1(config)#ip sla schedule 11 life forever start-time now

R1(config)#end

R1#

*Jul 10 10:51:26.079: %SYS-5-CONFIG_I: Configured from console by console

R1#show ip sla ?

application IP SLAs Application

authentication IP SLAs Authentication Information

auto IP SLAs Auto Show Commands

configuration IP SLAs Configuration

endpoint-list IP SLAs Endpoint list configuration

enhanced-history IP SLAs Enhanced History

ethernet-monitor IP SLAs Auto Ethernet Monitor

event-publisher IP SLAs Event Publisher

group IP SLAs Group Scheduling/Configuration

history IP SLAs History

mpls-lsp-monitor IP SLAs MPLS LSP Monitor

reaction-configuration IP SLAs Reaction Configuration

reaction-trigger IP SLAs Reaction Trigger

responder IP SLAs Responder Information

statistics IP SLAs Statistics

summary IP SLAs Statistics Summary

twamp IP SLAs TWAMP

R1#show ip sla configuration ?

<1-2147483647> Entry Number

| Output modifiers

<cr>

R1#show ip sla configuration 11 // VERIFY IP SLA CONFIGURATION

IP SLAs Infrastructure Engine-III

Entry number: 11

Owner:

Tag:

Operation timeout (milliseconds): 5000

Type of operation to perform: icmp-echo

Target address/Source address: 209.165.201.30/0.0.0.0

Type Of Service parameter: 0x0

Request size (ARR data portion): 28

Verify data: No

Vrf Name:

Schedule:

Operation frequency (seconds): 10 (not considered if randomly scheduled)

Next Scheduled Start Time: Start Time already passed

Group Scheduled : FALSE

Randomly Scheduled : FALSE

Life (seconds): Forever

Entry Ageout (seconds): never

Recurring (Starting Everyday): FALSE

Status of entry (SNMP RowStatus): Active

Threshold (milliseconds): 5000

Distribution Statistics:

Number of statistic hours kept: 2

Number of statistic distribution buckets kept: 1

Statistic distribution interval (milliseconds): 20

Enhanced History:

History Statistics:

Number of history Lives kept: 0

Number of history Buckets kept: 15

History Filter Type: None

R1#show ip sla statistics // VERIFY IP SLA STATISTICS SUCH AS NUMBER OF SUCCESSES, FAILURES, ETC

IPSLAs Latest Operation Statistics

IPSLA operation id: 11

Latest RTT: 16 milliseconds

Latest operation start time: 10:52:37 UTC Tue Jul 10 2018

Latest operation return code: OK

Number of successes: 9

Number of failures: 0

Operation time to live: Forever

R1#conf t

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

R1(config)#ip sla 22

R1(config-ip-sla)#icmp-echo 209.165.202.158

R1(config-ip-sla-echo)#frequency 10

R1(config-ip-sla-echo)#exit

R1(config)#ip sla schedule 22 life forever start-time now

R1(config)#end

R1#

*Jul 10 10:53:41.491: %SYS-5-CONFIG_I: Configured from console by console

R1#

R1#show ip sla configuration 22

IP SLAs Infrastructure Engine-III

Entry number: 22

Owner:

Tag:

Operation timeout (milliseconds): 5000

Type of operation to perform: icmp-echo

Target address/Source address: 209.165.202.158/0.0.0.0

Type Of Service parameter: 0x0

Request size (ARR data portion): 28

Verify data: No

Vrf Name:

Schedule:

Operation frequency (seconds): 10 (not considered if randomly scheduled)

Next Scheduled Start Time: Start Time already passed

Group Scheduled : FALSE

Randomly Scheduled : FALSE

Life (seconds): Forever

Entry Ageout (seconds): never

Recurring (Starting Everyday): FALSE

Status of entry (SNMP RowStatus): Active

Threshold (milliseconds): 5000

Distribution Statistics:

Number of statistic hours kept: 2

Number of statistic distribution buckets kept: 1

Statistic distribution interval (milliseconds): 20

Enhanced History:

History Statistics:

Number of history Lives kept: 0

Number of history Buckets kept: 15

History Filter Type: None

R1#show ip sla statistics 22

IPSLAs Latest Operation Statistics

IPSLA operation id: 22

Latest RTT: 40 milliseconds

Latest operation start time: 10:54:09 UTC Tue Jul 10 2018

Latest operation return code: OK

Number of successes: 4

Number of failures: 0

Operation time to live: Forever

R1#conf t

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

R1(config)#no ip route 0.0.0.0 0.0.0.0 209.165.201.1

R1(config)#ip route 0.0.0.0 0.0.0.0 209.165.201.1 5 // CONFIGURE FLOATING STATIC ROUTE THAT WILL APPEAR DEPENDING ON IP SLA RESULT

R1(config)#

R1(config)#do 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 209.165.201.1 to network 0.0.0.0

S* 0.0.0.0/0 [5/0] via 209.165.201.1

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.1.0/24 is directly connected, Loopback0

L 192.168.1.1/32 is directly connected, Loopback0

209.165.201.0/24 is variably subnetted, 2 subnets, 2 masks

C 209.165.201.0/30 is directly connected, Serial2/0

L 209.165.201.2/32 is directly connected, Serial2/0

209.165.202.0/24 is variably subnetted, 2 subnets, 2 masks

C 209.165.202.128/30 is directly connected, Serial2/3

L 209.165.202.130/32 is directly connected, Serial2/3

R1(config)#

R1(config)#track ?

<1-1000> Tracked object

resolution Tracking resolution parameters

timer Polling interval timers

R1(config)#track 1 ?

application Application

interface Select an interface to track

ip IP protocol

list Group objects in a list

stub-object Stub tracking object

R1(config)#track 1 ip ?

route IP route

sla IP Service Level Agreement

R1(config)#track 1 ip sla ?

<1-2147483647> Entry number

R1(config)#track 1 ip sla 11 ?

reachability Reachability

state Return code state

<cr>

R1(config)#track 1 ip sla 11 reachability // BIND IP SLA TO A TRACK OBJECT

R1(config-track)#?

Tracking instance configuration commands:

default Set a command to its defaults

default-state Default object state

delay Tracking delay

exit Exit from tracking configuration mode

no Negate a command or set its defaults

R1(config-track)#delay ?

down Delay down change notification

up Delay up change notification

R1(config-track)#delay down ?

<0-180> Seconds to delay

R1(config-track)#delay down 10 ?

up Delay up change notification

<cr>

R1(config-track)#delay down 10 up ?

<0-180> Seconds to delay

R1(config-track)#delay down 10 up 1 // CONFIGURE DELAY TO AVOID ROUTE FLAPPING

R1(config-track)#end

R1#

*Jul 10 10:58:18.631: %SYS-5-CONFIG_I: Configured from console by console

R1#debug ip routing

IP routing debugging is on

R1#conf t

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

R1(config)#ip route 0.0.0.0 0.0.0.0 209.165.201.1 2 ?

multicast multicast route

name Specify name of the next hop

permanent permanent route

tag Set tag for this route

track Install route depending on tracked item

<cr>

R1(config)#ip route 0.0.0.0 0.0.0.0 209.165.201.1 2 track ?

<1-1000> tracked object number

R1(config)#ip route 0.0.0.0 0.0.0.0 209.165.201.1 2 track 1

R1(config)#

*Jul 10 10:58:56.711: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 10:58:56.715: RT: closer admin distance for 0.0.0.0, flushing 1 routes

*Jul 10 10:58:56.719: RT: add 0.0.0.0/0 via 209.165.201.1, static metric [2/0]

*Jul 10 10:58:56.719: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 10:58:56.723: RT: rib update return code: 17

*Jul 10 10:58:56.727: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 10:58:56.731: RT: rib update return code: 17

R1(config)#

R1(config)#track 2 ip sla 22 reachability

R1(config-track)#delay down 10 up 1

R1(config-track)#

R1(config-track)#exit

R1(config)#ip route 0.0.0.0 0.0.0.0 209.165.202.129 3 track 2

R1(config)#

*Jul 10 10:59:56.255: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 10:59:56.259: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 10:59:56.263: RT: rib update return code: 17

*Jul 10 10:59:56.271: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.202.129 1048578

*Jul 10 10:59:56.275: RT: rib update return code: 17

R1(config)#end

R1#

R1#show ip route // THE NEW STATIC ROUTE DIDN'T TAKE EFFECT SINCE ADMIN DISTANCE OF 3 HIGHER THAN 2 (LOWER AD IS PREFERRED)

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 209.165.201.1 to network 0.0.0.0

S* 0.0.0.0/0 [2/0] via 209.165.201.1

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.1.0/24 is directly connected, Loopback0

L 192.168.1.1/32 is directly connected, Loopback0

209.165.201.0/24 is variably subnetted, 2 subnets, 2 masks

C 209.165.201.0/30 is directly connected, Serial2/0

L 209.165.201.2/32 is directly connected, Serial2/0

209.165.202.0/24 is variably subnetted, 2 subnets, 2 masks

C 209.165.202.128/30 is directly connected, Serial2/3

L 209.165.202.130/32 is directly connected, Serial2/3

R1#

ISP1#conf t

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

ISP1(config)#interface loop 1 // DISABLE ISP1 DNS

ISP1(config-if)#shut

ISP1(config-if)#

*Jul 10 11:00:18.183: %LINK-5-CHANGED: Interface Loopback1, changed state to administratively down

*Jul 10 11:00:19.183: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to down

R1#

*Jul 10 11:02:51.871: %TRACKING-5-STATE: 1 ip sla 11 reachability Up->Down

*Jul 10 11:02:51.875: RT: del 0.0.0.0 via 209.165.201.1, static metric [2/0]

*Jul 10 11:02:51.875: RT: delete network route to 0.0.0.0/0

*Jul 10 11:02:51.879: RT: default path has been cleared

*Jul 10 11:02:51.879: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.202.129 1048578

*Jul 10 11:02:51.879: RT: add 0.0.0.0/0 via 209.165.202.129, static metric [3/0]

*Jul 10 11:02:51.883: RT: default path is now 0.0.0.0 via 209.165.202.129

*Jul 10 11:02:51.883: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 11:02:51.883: RT: rib update return code: 17

*Jul 10 11:02:51.907: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.202.129 1048578

R1#

*Jul 10 11:02:51.911: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 11:02:51.915: RT: rib update return code: 17

R1#show ip route // ROUTING TABLE INSTALLS THE NEXT FLOATING STATIC ROUTE GOING TO ISP2 (AD 3)

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 209.165.202.129 to network 0.0.0.0

S* 0.0.0.0/0 [3/0] via 209.165.202.129

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.1.0/24 is directly connected, Loopback0

L 192.168.1.1/32 is directly connected, Loopback0

209.165.201.0/24 is variably subnetted, 2 subnets, 2 masks

C 209.165.201.0/30 is directly connected, Serial2/0

L 209.165.201.2/32 is directly connected, Serial2/0

209.165.202.0/24 is variably subnetted, 2 subnets, 2 masks

C 209.165.202.128/30 is directly connected, Serial2/3

L 209.165.202.130/32 is directly connected, Serial2/3

R1#

R1#show ip sla statistics // ICMP TO ISP 1 DNS FAILED

IPSLAs Latest Operation Statistics

IPSLA operation id: 11

Latest RTT: NoConnection/Busy/Timeout

Latest operation start time: 11:03:27 UTC Tue Jul 10 2018

Latest operation return code: Timeout

Number of successes: 67

Number of failures: 7

Operation time to live: Forever

IPSLA operation id: 22

Latest RTT: 32 milliseconds

Latest operation start time: 11:03:19 UTC Tue Jul 10 2018

Latest operation return code: OK

Number of successes: 57

Number of failures: 2

Operation time to live: Forever

R1#traceroute 209.165.200.254 source 192.168.1.1 // TRAFFIC NOW GOES VIA ISP 2 HOP

Type escape sequence to abort.

Tracing the route to 209.165.200.254

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

1 209.165.202.129 44 msec 36 msec 12 msec

ISP1(config)#interface loop 1

ISP1(config-if)#no shut

ISP1(config-if)#

*Jul 10 11:03:04.459: %LINK-3-UPDOWN: Interface Loopback1, changed state to up

*Jul 10 11:03:05.463: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback1, changed state to up

R1#

*Jul 10 11:05:32.887: %TRACKING-5-STATE: 1 ip sla 11 reachability Down->Up

*Jul 10 11:05:32.891: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 11:05:32.895: RT: closer admin distance for 0.0.0.0, flushing 1 routes

*Jul 10 11:05:32.899: RT: add 0.0.0.0/0 via 209.165.201.1, static metric [2/0]

*Jul 10 11:05:32.899: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.202.129 1048578

*Jul 10 11:05:32.903: RT: rib update return code: 17

*Jul 10 11:05:32.907: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.202.129 1048578

*Jul 10 11:05:32.911: RT: rib update return code: 17

*Jul 10 11:05:32.915: RT: updating static 0.0.0.0/0 (0x0):

via 209.165.201.1 1048578

*Jul 10 11:05:32.919: RT:

R1#rib update return code: 17

R1#

R1#show ip sla statistics

IPSLAs Latest Operation Statistics

IPSLA operation id: 11

Latest RTT: 8 milliseconds

Latest operation start time: 11:06:07 UTC Tue Jul 10 2018

Latest operation return code: OK

Number of successes: 72

Number of failures: 18

Operation time to live: Forever

IPSLA operation id: 22

Latest RTT: 24 milliseconds

Latest operation start time: 11:06:09 UTC Tue Jul 10 2018

Latest operation return code: OK

Number of successes: 74

Number of failures: 2

Operation time to live: Forever

R1#show ip route // ROUTE VIA ISP1 RE-ESTABLISHED WITH AD 2

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 209.165.201.1 to network 0.0.0.0

S* 0.0.0.0/0 [2/0] via 209.165.201.1

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.1.0/24 is directly connected, Loopback0

L 192.168.1.1/32 is directly connected, Loopback0

209.165.201.0/24 is variably subnetted, 2 subnets, 2 masks

C 209.165.201.0/30 is directly connected, Serial2/0

L 209.165.201.2/32 is directly connected, Serial2/0

209.165.202.0/24 is variably subnetted, 2 subnets, 2 masks

C 209.165.202.128/30 is directly connected, Serial2/3

L 209.165.202.130/32 is directly connected, Serial2/3

My Network Lab

Friday, January 11, 2019

Configuring Path Control via IP SLA Tracking

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