reliable static routing backup using object tracking

Unanswered Question
Jan 21st, 2009
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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 1.1.1.1 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 1.1.1.2 255.255.255.252

!

interface FastEthernet0/0

description - Backup Cable Modem -

ip address dhcp

!

ip route 0.0.0.0 0.0.0.0 1.1.1.1 track 50

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 254

!

access-list 100 remark ACL to trigger PBR

access-list 100 permit icmp any host 1.1.1.1 echo

!

route-map PBR permit 10

match ip address 100

set ip next-hop 1.1.1.1

set interface Null 0

!

ip local policy route-map PBR

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Tshi M Wed, 01/21/2009 - 08:23
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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.


Regards,

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