missing eigrp interface

[#1]

with a "show ip eigrp interface" the routers show serial 0/0 and fastethernet 0/0 at 18 of our sites, but 2 sites show only serial 0/0. It appears the networks are being advertised but why is the fastethernet 0/0 int. missing. All configs appear the same, 3600 and 2600 routers with ios 12.2

anyone have any ideas?.

[b.shoresh]

Hello.

It is possible that the missing interface is configured as passive-interface.

You should look for one of the following configuration commands on you're routers:

1) router eigrp x

passive-interface FastEthernet 0/0

In this case just remove the command "passive-interface FastEthernet 0/0"

2) router eigrp x

passive-interface default

no passive-interface Serial 0/0

In this case just add the command "no passive-interface FastEthernet 0/0"

Hope this will help you.

Boaz.

[ruwhite]

The fast ethernets being marked passive can cause this, as the other poster noted. If the interfaces are not marked passive, we will need more information to resolve this--we would need the configs, and a show ip eigrp topo for the specific route connected through these interfaces, I think, as a start. If they are not marked as passive, then I would guess it would be best to open a TAC case to figure out what is going on.

:-)

Russ