RIP (Force preference of one FE over another FE)

[johnelliot]

Just wondering if there is a way to force RIP to prefer one FE int over another(By default(From memory), I believe it prefers the Int with the highest #? i.e. so fe0/1 would be preferred over fe0/0(If both have the same hop count)?

[ankbhasi]

Hi Friend,

AFAIK on cisco layer 3 devices RIP behavior is it will store 4 routes and balance them if they have same hop count for same destination.

Tye type of load-balancing you get (i.e. per packet or per destination) depends on the switching mechanism deployed on the router. Fast/CEF switching etc by default uses per destination load balancing

Do you see only one route installed via one interface in your routing table for same destination?

Regards,

Ankur

[vladrac-ccna · Accepted solution]

you can use an off-set list to do the job (as long as it does go over the 15hop limit).

router rip

offset-list 10 in 1 fa0/0

access-list 10 permit any

This will add 1 hop to the routes received on fa0/0 and now your router will prefer fa0/1

Vlad

[johnelliot]

Thanks!

Prior to adding offset-list 192.168.10.0/24 was being per-dest load balanced(As Ankur indicated it should (with hop counts being equal)):

#show ip rip database

[...]

192.168.10.0/24 auto-summary

192.168.10.0/24

[1] via 10.195.0.2, 00:00:09, FastEthernet0/0

[1] via 10.195.1.2, 00:00:05, FastEthernet0/1

[...]

Then after:

#show ip rip database

[...]

192.168.10.0/24 auto-summary

192.168.10.0/24

[1] via 10.195.1.2, 00:00:03, FastEthernet0/1

[...]

Thanks Guys.