Hi Dave:
On the "failed" 7507, do a "show ip ospf neighbor" and see if the "states"
are
showing "FULL" for all its neighbors. If not, that means they aren't fully
adjacent with each others, and that could be the resaon why you aren't seeing
any routes on that 7507. However, as to why the "state" isn't FULL, I believe
you will have to do some troubleshooting yourself (such as password mismatched
if you use OSPF Area Authentication). Other commands such as "show ip ospf
database
network", "show ip ospf interface", and other show ip ospf commands may help.
Just my $0.02.
Regards,
William
At 04:27 PM 1999/12/9 +0000, Dave Wilson wrote:
>Hi there,
>
>Any suggestions on this?
>
>Four Cisco 7507's, running 12.0.5(S), and four 7206's running the same.
>One of each per site. Each 7507 has:
>
>* E3 connections to two of the others, so the sites are
> arranged in a ring.
>
>Three of the 7507s have:
>
>* A local Packet Over Sonet connection to a 7206 at each site
>
>* A fast ethernet connection to that same 7206, a 3640, and a 2610
>
>Therefore each 7206 is reachable from the rest of the network only
>through its local 7507.
>
>We're running OSPF on all the interfaces, area 0. Every router shows
>all its neighbours - two via E3, one via POS, and one (or more) via Fast
>Ethernet.
>
>Every 7206 sees the entire routing table, including all three ethernets.
>However, *one* of the 7507's - not the one missing a 7206 - is not showing
>any routes learned over the E3 lines in a "sh ip route". The routes learned
>over POS are shown (only one at the moment, and that's a backup route to
>the local ethernet, but it's working nevertheless). The routes learned
>via the E3s are passed on to its local 7206. But they do not appear in
>the output of a "sh ip route".
>
>I did have incorrect masks on my loopbacks, which were fixed, but didn't
>solve the problem. We've rebooted every router in the network; didn't
>solve. We pulled out one of the RSP's in the 7507, and rebooted every
>router again; it showed the same problem. It affects both E3 lines,
>but there seems to be no physical problem with either of them. So it
>doesn't look like hardware.
>
>ip cef came turned on by default on the 12.0 config. We tried turning
>it off. No effect.
>
>FWIW, this is *very* similar to what happens in BGP if you forget to type
>"no synchronisation" into your BGP config - but there the similarity ends.
>As far as I know, OSPF just shouldn't ever behave like that, or even fail
>like that.
>
>Confused,
>Dave
>
>--
> dave.wilson@heanet.ie ---------------------------------------
+353-1-662-3412
> It is one thing to pray; it is another to pray to entities who might not
only
> be listening, but who will search you out on the road and beat you across
the
> head with sticks if you say something that offends them. -- Neil
Gaiman
>
>
>
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