[c-nsp] l2tpv3 on 7500

[Joe Maimon]

Hey all,

I am trying to create some l2 dot1q xconnect's using l2tpv3 on a couple 
of 7500's.

The tunnel/vc comes up, but when I ping from one host to the other over 
this l2tpv3 bridged vlan, I can see on the far side replies to the arp 
queries, but those replies dont make it back to the originating host.

The symptoms appear to reverse themselves depending on which side is 
doing the pinging.

The config's look like this.

routerA:

l2tp-class pswire-l2tp
pseudowire-class pswire-l2tp
  encapsulation l2tpv3
  ip local interface Loopback0
interface Loopback0
  ip address x.x.x.110 255.255.255.255
  no clns route-cache
interface Port-channel1.34
  encapsulation dot1Q 34
  xconnect y.y.y.248 1 pw-class pswire-l2tp

RouterB:

l2tp-class pswire-l2tp
pseudowire-class pswire-l2tp
  encapsulation l2tpv3
  ip local interface Loopback0
interface Loopback0
  ip address y.y.y.248 255.255.255.255
interface Port-channel1.34
  encapsulation dot1Q 34
  xconnect x.x.x.110 1 pw-class pswire-l2tp

The routers report:

Router A:

Tunnel id 25275 is up, remote id is 36785, 1 active sessions
   Tunnel state is established, time since change 12:43:10
   Tunnel transport is IP (115)
   Remote tunnel name is noc08rt15
     Internet Address y.y.y.248, port 0
   Local tunnel name is noc10rt11
     Internet Address x.x.x.110, port 0
   Tunnel domain unknown
   VPDN group for tunnel is not available
   L2TP class for tunnel is l2tp_default_class
   135207 packets sent, 2849 received
   8653248 bytes sent, 264456 received
   Last clearing of "show vpdn" counters never
   Control Ns 5326, Nr 5320
   Local RWS 2048 (default), Remote RWS 2048 (max)
   Tunnel PMTU checking disabled
   Retransmission time 1, max 1 seconds
   Unsent queuesize 0, max 0
   Resend queuesize 0, max 2
   Total resends 11, ZLB ACKs sent 5317
   Current nosession queue check 0 of 5
   Retransmit time distribution: 0 0 3 0 3 0 0 0 5
   Sessions disconnected due to lack of resources 0


Router B:

Tunnel id 36785 is up, remote id is 25275, 1 active sessions
   Tunnel state is established, time since change 12:42:30
   Tunnel transport is IP (115)
   Remote tunnel name is noc10rt11
     Internet Address x.x.x.110, port 0
   Local tunnel name is noc08rt15
     Internet Address y.y.y.248, port 0
   Tunnel domain unknown
   VPDN group for tunnel is not available
   L2TP class for tunnel is l2tp_default_class
   2851 packets sent, 135176 received
   264994 bytes sent, 8651264 received
   Last clearing of "show vpdn" counters never
   Control Ns 5319, Nr 5325
   Local RWS 2048 (default), Remote RWS 2048 (max)
   Tunnel PMTU checking disabled
   Retransmission time 1, max 1 seconds
   Unsent queuesize 0, max 0
   Resend queuesize 0, max 2
   Total resends 14, ZLB ACKs sent 5322
   Current nosession queue check 0 of 5
   Retransmit time distribution: 0 0 6 0 3 0 0 0 5
   Sessions disconnected due to lack of resources 0

Thanks in advance for any help,

Joe