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Tracking Objects – Ejemplos y Configuración Básica para rutas estáticas y route-maps

Introducción

Este documento provee una configuración muestra del feature Reliable Static Routing Backup Using Object Tracking feature, conocido también como tracking objects.     Este feature da la habilidad  al Cisco IOS software para utilizar  Internet Control Message Protocol (ICMP) pings de forma que podamos identificar cuando un Point-to-Point over Ethernet (PPPoE) o un IP Security Protocol (IPSec) Virtual Private Network (VPN) tunnel va hacia abajo, permitiendo la entrada de una conexión backup desde un puerto alterno.    Este feature es compatible tanto para rutas estáticas como configuraciones con DHCP.

Alcances

Este documento sirve como guía de configuración básica y en ningún momento sustituye la información que se encuentra en CCO y CEC

Prerrequisitos

·         Verificar en el Cisco Feature Navigator sobre Soporte en la plataforma y las imágenes de IOS.

Configuración

·         A partir de la versión 12.3(8)T  

rtr 1

type echo protocol ipIcmpEcho 41.41.41.254 source-ipaddr 4.4.4.1

timeout 1000

threshold 2

frequency 3

rtr schedule 1 life forever start-time now

!

track 123 rtr 1 reachability

!

ip local policy route-map MY_LOCAL_POLICY

!

ip route 0.0.0.0 0.0.0.0 4.4.4.254 track 123

ip route 0.0.0.0 0.0.0.0 5.5.5.254 2

!

access-list 101 permit icmp any host 41.41.41.254

!

route-map MY_LOCAL_POLICY permit 10

match ip address 101

set ip next-hop 4.4.4.254

·         A partir  de la versión 12.3(14)T

ip sla monitor 1

type echo protocol ipIcmpEcho 41.41.41.254 source-ipaddr 4.4.4.1

timeout 1000

threshold 2

frequency 3

ip sla monitor schedule 1 life forever start-time now

!

track 123 rtr 1 reachability

!

ip local policy route-map MY_LOCAL_POLICY

!

ip classless

ip route 0.0.0.0 0.0.0.0 4.4.4.254 track 123

ip route 0.0.0.0 0.0.0.0 5.5.5.254 2

access-list 101 permit icmp any host 41.41.41.254

!

route-map MY_LOCAL_POLICY permit 10

match ip address 101

set ip next-hop 4.4.4.254

·         A partir de la version 12.4(4)T

ip sla 1

icmp-echo 41.41.41.254 source-ip 4.4.4.1

timeout 1000

threshold 2

frequency 3

ip sla schedule 1 life forever start-time now

!

track 123 rtr 1 reachability

!

ip local policy route-map MY_LOCAL_POLICY

!

ip classless

ip route 0.0.0.0 0.0.0.0 4.4.4.254 track 123

ip route 0.0.0.0 0.0.0.0 5.5.5.254 2

!

access-list 101 permit icmp any host 41.41.41.254

!

route-map MY_LOCAL_POLICY permit 10

match ip address 101

set ip next-hop 4.4.4.254

Verificación

Router# show ip route track-table
 
ip route 0.0.0.0 0.0.0.0 10.1.1.242 track-object 123 state is [up]

Información Relacionada

http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html#wp1072790

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Comments

NOTA:  en varias versiones se ha identificado que los route-maps no  funcionan adecuadamente, por lo que se suguiere quitarlos y utilizar una  nota permanente en su lugar hacia la ip address que se desea hacer  ping.

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