[HECnet] ROOSTA routing problem

[Johnny Billquist]

On 2011-12-26 15.41, Bob Armstrong wrote:
I can't talk to SG1 from MIM either, and thus nothing beyond it.

    SG1 appears to be down (at least my connection to it isn't working,
either).

It sounds like we can declare SG1 down then, yes. :-)

And SG1 is currently acting as the next hop for a whole bunch of areas, as
seen from area 1.

    Like what?   Most of these nodes should have redundant paths (that's good,
remember :-) so it sounds like MIM's routing table is stale.

It don't really work that way always, unfortunately.

As far as MIM is concerned, SG1 is still up, no matter how defunct it is. It is still broadcasting routing information, and is still therefore considered in the route selection, and it wins for a bunch of areas.
If SG1 would just go away, another path would be chosen, yes, but SG1 has not gone away. It is just broken in some way making it appear to be ok from a routing point of view.

    Somebody really should make a diagram of the HECnet topology...

Yes, please! It would be very nice.

	Johnny