From: Swan, Jay (jswan@sugf.com)
Date: Wed Dec 26 2007 - 15:46:12 ART
If (as you mention in the original message) the debug says you have an
area mismatch, it should also tell you the source address of the hello
packet that caused the problem. Something like this:
OSPF: Rcv pkt from 2.2.2.5, FastEthernet0/0, area 0.0.0.4
mismatch area 0.0.0.1 in the header
You then just have to find 2.2.2.5, figure out if it's supposed to be an
OSPF neighbor or not, and then make the appropriate changes.
It doesn't seem like OSPF network types and MTUs could be the problem if
the router's telling you that somebody is in the wrong area.
Jay
#17783
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Darby Weaver
Sent: Wednesday, December 26, 2007 9:09 AM
To: Tom Hanks; Cisco certification
Cc: t_hanks_2007@yahoo.com
Subject: Re: OSPF MTU Issue (Mismatch Area X In The Header)
Can you post the relevant configurations?
What I think I hear you saying is that you've changed
the switches to an mtu of 1504 and use ip ospf
mtu-ignore on the routers in question.
But with what device is the "INIT" state issue
happening on and more importantly which interface and
which neighbor.
All OSPF neighbors in an area will need to share the
same mtu or use ip ospf myu-ignore to get over that
one.
But what about those neighbors over the frame?
If you do "sh ip ospf int serial x" for both sides of
the frame circuit what are you seeing. Look
carefully. Remember Hello and Dead Timers must match
as well if not, then you need to either modify with
"ip ospf network ???" or perhaps change the times to
match on a per link basis.
Also what do your debugs tell you?
You did not mention authentication, so not part of the
equation yet.
--- Tom Hanks <t_hanks_2007@yahoo.com> wrote:
> Hi Guys,
>
> I am facing a problem in a topology where an OSPF
> area X is connecting R1 and R2 to my 4 switches, and
> two of the 4 switches are also running OSPF Area Y.
> I am running a DOT1q-tunnel on two switches, hence
> am changing the MTU of all the the switches to 1504
> since the 4 switches are meshed(system mtu 1504).
>
> However, I am facing a problem on one of the
> frame-relay point to point connections forming an
> adjacency in OSPF area X on R1 and R2. I have given
> the command "ip ospf mtu-ignore" on the relevant
> interfaces of R1 and R2 that are connecting to the
> switches, however R1 and R2 adjacency over
> frame-relay serial main int gets stuck in INIT
> state, and when I run debug it says :
>
> "Mismatch Area X in the header"
>
> Any clues on this ?
>
> Regards
>
> Tom
>
>
>
>
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