[c-nsp] ISIS parallel P2P adjacency over tunnel

[Oliver Boehmer (oboehmer)]

cisco-nsp-bounces at puck.nether.net <> wrote on Sunday, October 01, 2006
7:54 AM:

 
> I'm running ISIS on an E3 link (only L2 adjacency) between
> two Cisco 7206
> boxes (acting as L1/L2 IS). Things are pretty fine and
> traffic is moving.
> Recently I created 2 tunnels out of the boxes to each other via their
> upstream providers (as backup of the P2P E3 circuit) Tunnels
> are up and
> running, however I'm unable to establish parallel/simultaneous ISIS L2
> adjacency between the boxes over the tunnels.
> 
> I get the following message when I run "sh clns neighbor
> detail" on 1 box:
[...]
> gwi          Tu51        <ip address>      Up     27        L2   IS-IS
> ...
>   IP parallel adjacency suppressed
> 
> However, I do need to establish parallel adjacency on the
> tunnel besides the E3 link.

This message only tells you that the local router does not advertise
this adjacency in its LSPs (it only advertises the best/lowest-cost
adjacency). The adjacency over the tunnel is established just fine, and
if the adjacency over the E3 link goes down, the tunnel will be used.

	oli