Question on how to identify an unknown port or connection in Rapid Spanning Tree

[wingchingleung]

As I was mapping out the spanning tree architecture  I came across a link (Tengig 1/1) which does not exist  as my ten gig module is in slot 9 and the only thing that is in slot 1 is the Cisco ACE load balancer.

swx1.lax1#sh spanning-tree vlan 12

VLAN0012
  Spanning tree enabled protocol rstp
  Root ID    Priority    8204
             Address     0022.9189.d400
             Cost        3
             Port        1670 (Port-channel11)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32780  (priority 32768 sys-id-ext 12)
             Address     0022.be6f.6000
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time 480

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/1               Desg FWD 2         128.1    P2p Edge 
Gi3/14              Desg FWD 4         128.270  P2p 
Po11                Root FWD 3         128.1670 P2p 
Po21                Altn BLK 3         128.1672 P2p 

How did the tengig 1/1 come about ? Could it be the backplane connection for the ACE module ? Please advise.

[Leo Laohoo]

It's the backplane, I suspect.

[wingchingleung]

Verified with Cisco - it is the 10G trunk which the ACE module uses to communicate with the backplane.

But I thought each line card only has dual channel and can only access to the 32G bus in the backplane (so about 8G per channel x 4  =32 G) ??

Anyone has the article or white paper about the 6509 architecture ?