reliable static routing backup using object tracking

Unanswered Question
Jan 21st, 2009
User Badges:

hello all. i'd like to confirm the following proposal before telling a customer the scenario is doable. a customer wishes to have a primary internet T1 connection, and a backup cable modem. i've been reading the PDF for reliable static routing and would like to make sure i can acheive the following config (i haven't tested it in a lab):

ip sla monitor 1

type echo protocol ipIcmpEcho source-interface serial 0/1/0:0

timeout 1000

threshold 2

frequency 3



ip sla monitor schedule 1 life forever start-time now


track 50 rtr 1 reachability



interface Serial0/1/0:0

description - T1 connection -

ip address


interface FastEthernet0/0

description - Backup Cable Modem -

ip address dhcp


ip route track 50

ip route FastEthernet0/0 254


access-list 100 remark ACL to trigger PBR

access-list 100 permit icmp any host echo


route-map PBR permit 10

match ip address 100

set ip next-hop

set interface Null 0


ip local policy route-map PBR

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Tshi M Wed, 01/21/2009 - 08:23
User Badges:
  • Silver, 250 points or more

I am assuming that you are pinging the far side of your serial interface in this config. if that is the case, you can still ping the /32 interace but that does not mean that the internet is reachable.

I would use either dns or http for the the SLA or ping an internet address. If I use either DNS or HTTP, I would not bother with the PRB.



This Discussion