[c-nsp] 2811 login issues

[Chris Wopat]

> Date: Tue, 9 Feb 2010 11:36:21 -0600
> From: Chris Wopat <me at falz.net>
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] 2811 login issues
>
> I have a 2811 that stopped accepting logins from its FastEthernet
> interface last week out of the blue. When this happened there were no
> config changes, router reboots, etc. It has a Multilink bundle
> unnumbered via that FastEthernet interface and it *does* accept logins
> from this direction. Config is simple, a default route via FA and a
> /24 via MU.

Although no one replied I'd like to post the solution to this for the
to potentially help anyone reading this in the future. The first few
minutes the router is booted (all interfaces are up during this
period):

# sh ip route | inc 3.88
C       10.170.3.88/29 is directly connected, FastEthernet0/0

Then for some reason 5-10 minutes later it would change to:

# sh ip route | inc 3.88
C       10.170.3.88/32 is directly connected, FastEthernet0/0

Numbering Mu1 fixed it. I still have no clue why this was happening
but am content with it being fixed. I have even less of a clue as to
why this just started happening out of the blue one day after being up
for many months with no config changes, interface flaps or even user
logins but am happy that it's working.

--Chris