[nsp] ESR 10008 MPLS Tunnel woe

[Nic McCartney]

Dear all,

Here is my network topology :-

 [7513a]<--pos-->[ESR10k]<---ATM--->[7513b]<--pos-->[7513c]
12.0(25)S1       12.0(25)S1         12.0(24)S     12.0(25)S1

I have a pair of tunnels, one ESR10K > 7513b and t'other 7513b > ESR10K.
When I send traffic from 7513c to 7513a then I see the traffic use the
tunnel I have set up between 7513b and ESR10K (interestingly when I send a
high number of pings it takes a full 7 seconds for the Tunnel stats to show
that anything is passing).

When I send traffic from 7513a -> 7513c then I see my pings go OK but the
traffic does not appear to be going over the tunnel ESR10K->7513b. By this I
mean the stats do not show anything. The tunnel stats are all
zeros. Funny thing is this, if I am on ESR10K and ping to 7513c then the
Tunnel stats *do* increment.
If I do sh ip rou <dest_ip> on ESR10K then it shows the Tunnel as the chosen
route. It is indeed a most perplexing mystery. Anybody seen this before?

Regards,

Nic