John, St1 is a logical interface associated with the internal stack.
Arie -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of john douglas Sent: Monday, July 07, 2008 09:34 AM To: [email protected] Subject: [c-nsp] What is spanning tree interface "St1" Hi All, I am investigating some ongoing spanning tree root changes and I am seeing this interface "St1" appearing in the STP root debug 016536: Jul 7 16:10:01.680 AEST: STP: VLAN0148 heard root 32916-0013.60a9.0f00 on St1 016537: Jul 7 16:10:01.680 AEST: STP: VLAN0149 Topology Change rcvd on St1 016538: Jul 7 16:10:01.680 AEST: STP: VLAN0148 heard root 32916-0013.60a9.0f00 on St1 016544: Jul 7 16:10:01.722 AEST: STP: VLAN0148 we are the spanning tree root 016545: Jul 7 16:10:01.722 AEST: STP: VLAN0148 heard root 8340-0008.e379.d980 on Gi1/0/28 016546: Jul 7 16:10:01.722 AEST: supersedes 32916-0013.60a9.0f00 016547: Jul 7 16:10:01.722 AEST: STP: VLAN0148 new root is 8340, 0008.e379.d980 on port Gi1/0/28, cost 39 016548: Jul 7 16:10:01.722 AEST: STP: VLAN0148 sent Topology Change Notice on Gi1/0/28 016549: Jul 7 16:10:02.678 AEST: STP: VLAN0148 Topology Change rcvd on St1 My google fu must be bad today because I cannot seem to find any reference to spanning tree and "St1" at all .. I see similar output in the sh spanning tree details for this vlan. I only have 2 interfaces on the switch that live in Vlan 148, however I now have this magical interface "St1" which has appeared with cost 100 ? #sh vlan id 148 VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 148 foofoofoobar1 active Gi1/0/28, Gi2/0/23 #sh spanning-tree vlan 148 VLAN0148 Spanning tree enabled protocol ieee Root ID Priority 8340 Address 0008.e379.d980 Cost 38 Port 28 (GigabitEthernet1/0/28) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32916 (priority 32768 sys-id-ext 148) Address 0013.60a9.0f00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Gi1/0/28 Root FWD 29 128.28 P2p St1 Desg FWD 100 128.1000 P2p Gi2/0/23 Desg FWD 9 128.75 P2p Ideas anyone? _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
