From: Sean C (Upp_and_Upp@hotmail.com)
Date: Tue May 24 2005 - 22:44:27 GMT-3
Hi Lanny,
2 things:
1-I've always thought that the default for OSPF tunnels is point-to-point -
IPv4 or IPv6. But I see where you can assume different from the CD:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/ipv6_c/sa_tunv6.htm#wp1048589
"The key difference between automatic 6to4 tunnels and manually configured
tunnels is that the tunnel is not point-to-point; it is point-to-multipoint.
In automatic 6to4 tunnels, routers are not configured in pairs because they
treat the IPv4 infrastructure as a virtual nonbroadcast multiaccess (NBMA)
link."
Have read that, I have to think that the router still assumes an 6to4 tunnel
would use an OSPF network type of point-to-point. Hard to explain, but I
think while the router will allow the tunnel to be NBMA, OSPF doesn't care -
it sees the tunnel as a p2p unless told otherwise. Perhaps someone else can
verify or explain this better.
2-Can you post your configs? Perhaps it's as something as simple as the hex
is wrong. I got stuck on my first 6to4 tunnel for 30 mins simply because I
designated my source IP, not my source interface (hope that makes sense).
Anyway, configs help us help you.
HTH,
Sean
----- Original Message -----
From: "Lanny Ballard" <lanny26ga@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, May 24, 2005 7:50 PM
Subject: ipv6 ospf
> I'm trying to get ospf running over an ipv6 tunnel
> I'm using a 6to4 tunnel, and i can ping each end.
> My understanding is that automatic tunnels are treated as nbma or
> point-to-multipoint
>
> I noticed under sh ipv6 ospf int, that the tunnel was considered as
> point-to-point even after I enabled ospf on it. I changed the network
> type to point-to-multipoint with no luck. I then changed it to
> Non-broadcast and manually configured ipv6 ospf neighbors, but still no
> luck, they got stuck in the Exstart state. They kept on retransmitting
> the DBDs, it was like the DBDs got lost or something. It is not an MTU
> error, seeing as how I have ipv6 ospf mtu-ignore on both sides of the
> tunnel.
>
> I think I'm just missing a basic configuration here. Can someone help?
>
> TIA
> Lanny
>
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