OSPF loading State

[Ryan Whelan]

On Tue, Aug 2, 2011 at 4:44 AM, Ondrej Zajicek <santiago at crfreenet.org> wrote:
> On Mon, Aug 01, 2011 at 10:57:01PM -0400, Ryan Whelan wrote:
>>    I'm now having this issue with a new device and its chronic.  It goes into
>>    'loading' every time bird starts without fail and does not seem to ever
>>    fully peer.  One end of the tunnel is in 'full', with the other contently
>>    in 'loading'; no routing information gets exchanged.  I'm not really sure
>>    how to trouble shoot the issue, I tried removing the security and other
>>    static protocols to no avail.
>
> If it is a permanent problem, it could be be easily debugged. But in the
> past, permanent problems with the same manifestation showed to be some
> some different problems, usually with the interface (like mismatching MTUs)
>
>>    I have logs and tcpdumps if anyone is interested- assuming this is a bug
>>    and I'm not doing something wrong.
>
> Could you send me these? For BIRD logs, i would be useful to have logs
> with enabled 'debug { events, packets }' for OSPF on both sides.
>
>>    The only difference between this PtP link and the others I've setup, is
>>    this link is a tunnel setup with OpenVPN instead of IPSec.  In the past
>>    I've used Bird with Quagga over OpenVPN links, so I wouldn't assume thats
>>    the issue?
>
> Shouldn't be. But OpenVPN is a strange beast, perhaps it has some
> strange behavior to packets. One possible change in BIRD is that packets
> for PTP ifaces were sent to unicast IP in the past but it was changed to
> allrouters-multicast IP (to be consistent with standard). If OpenVPN
> have some problems with multicast, that may be the problem.
> In that case the solution would be to switch the iface type to PTMP.
>
> --
> Elen sila lumenn' omentielvo
>
> Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
> "To err is human -- to blame it on a computer is even more so."
>
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>

Upon trying again, I am unable to get it to go into the loading state.
When I posted my last message on the list, I had a peer that would go
in to loading, and regardless of which bird instance I restarted, in
any order, it refused to move to state full.  The next day I was
unable to reproduce it consistently.  The only difference I can think
of (and I don't know for sure) is on the opposite peer from the one
that was stuck in loading, I had an interface in the bird config that
was not up on the system.  I can't be sure as I don't recall, but
that's the only thing I can think of that might have changed from one
day to the next.

I apologise for 'crying wolf', but for a couple hours it really was a
chronic issue. Sorry I can't be of more help on this.