[ILUG] Quagga temporarily drops routes after ifup eth0:1

[Kenn Humborg]

> First off, 0.98 is ancient. I've no idea whether it would fix your 
> problem, but we could at least discount a raft of bugs if you could 
> install the latest release (0.99.11 - you can build an rpm straight 
> from the tarball with 'rpmbuild -tb ...').

Haven't tried that yet - see below.

> Next, presuming the problem continues, is to figure out where things 
> are going wrong:
> 
> - is zebra losing track of the interface somehow?
> 
>    'sh interface' in the zebra CLI (or vtysh)
> 
> - is ospfd?
> 
>    'sh ip ospf interface' (ospfd cli)

This showed the cause, I think.  When I brought up eth0:1, the 
router-id changed to the new IP address, even though it had
previously used the IP address of eth1 as the router ID.

Specifying a router-id in ospfd.conf seems to have sorted it
out.

Is it best practice to hard-code a router-id in ospfd.conf?

Later,
Kenn