[c-nsp] RIP and Secondary IP

[Bruce Pinsky]

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Fernando Rojas wrote:
> Hi,
> 
> I have migrated the configuration from a 1600 to 1800 Cisco Router.
> 
> In a 1600, RIP is sending v2 update correctly. But with the same
> configuration, 1800 is not sending a update.
> 
> In a debug IP RIP:
> 
> 00:47:21: RIP: sending v2 update to 224.0.0.9 via FastEthernet0 (172.18.1.1)
> 00:47:21: RIP: build update entries - suppressing null update
> 
> 
> I have this configuration in a router 1801:
> 
> interface FastEthernet0
>  ip address 172.16.1.1 255.255.255.0 secondary
>  ip address 172.18.1.1 255.255.255.0 secondary
>  ip address 172.16.1.3 255.255.255.0 secondary
>  ip address 192.168.0.1 255.255.248.0
>  no ip redirects
>  ip nat inside
>  ip rip advertise 5
>  ip virtual-reassembly
>  ip policy route-map InterLAN
>  speed 100
>  full-duplex
>  no cdp enable
> 
> router rip
>  version 2
>  timers basic 5 15 30 60
>  redistribute connected
>  redistribute static
>  network 172.18.0.0
>  neighbor 172.18.1.2
> !
> no ip classless
> ip route 0.0.0.0 0.0.0.0 172.16.1.4
> ip route 192.168.9.0 255.255.255.0 172.16.1.4
> ip route 192.168.11.0 255.255.255.0 172.16.1.4
> ip route 192.168.15.0 255.255.255.0 172.16.1.4
> !
> !
> 
> I recevied correctly update route from a neighbor (172.18.1.2),
> but this router is not advertised nothing!
> 
> 
> IOS version: 12.4(2)XA ... Also update IOS router with lastest version (
> 12.4.4T1), but it did not work.
> 
> Somebody can help me?
> 

If you are expecting RIP adverts to be sent out the FE0 interface to
advertise the secondary networks to the primary and vice versa, it will not
happen by default.  That would violate split horizon.


- --
=========
bep

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