Spanning-tree question

[jrichterkessing]

When performing a "show spanning-tree" on a new pair of 3750 switches there is an interface displayed that I hadn't seen on any of my other 3750s, it's the St1 interface seen below (sorry...I'm sure the format will be messed up). Does anyone know what this interface is or point me to documentation that explains it?? Having trouble finding anything about it.

Thanks...Jeff

NCWS1SWZ4S2#sh spanning-tree

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 8192

Address 000f.f88e.b001

Cost 6

Port 680 (Port-channel9)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 0017.e088.5580

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- ------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Gi1/0/2 Desg FWD 4 128.2 P2p

Gi1/0/3 Desg FWD 4 128.3 P2p

Po2 Altn BLK 3 128.624 P2p

Po9 Root FWD 3 128.680 P2p

St1 Desg FWD 19 128.1000 P2p

[jrichterkessing]

I found it....it is the stack port. Not sure why I am seeing it on this stack and not others, but at least I know what it is!

JEff

[mchoo2005]

Could it be the StackWise cable linking the switch you're looking at with the Root?

[jrichterkessing]

That's exactly what it was, not sure why I'm not seeing it on my other 3750 stacks, guessing an IOS difference.

Thanks...Jeff

[Francois Tallet]

Do you have any debug enabled on this switch?

Regards,

Francois