STP Bridge MAC , how Catalyst is Selecting??

From: Khurram Khani (kkhani@xxxxxxxxxxxxxxxxxx)
Date: Tue Jun 04 2002 - 19:45:42 GMT-3

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Hi ,

I can see Catalyst is selecting a different Bridge Mac Address for each
Spantree Instance I am running.
This bridge mac is different then any Ethernet Port macs.

My ethernet port macs are in series: 00:30:7b:33:22:xx
Bridge Macs are in series: 00-10-1f-94-c0-xx

Is there an instruction to list all internally stores macs in Catalyst?

Thanks
Khurram.

onsole> (enable) show spantree
VLAN 1
Spanning tree enabled
Spanning tree type ieee

Designated Root 00-10-1f-94-c0-00
Designated Root Priority 32768
Designated Root Cost 0
Designated Root Port 1/0
Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec

Bridge ID MAC ADDR 00-10-1f-94-c0-00 <================== this
address !!!!
Bridge ID Priority 32768
Bridge Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec

Port Vlan Port-State Cost Priority Fast-Start Group-Method
--------- ---- ------------- ----- -------- ---------- ------------
 2/1 1 not-connected 19 32 disabled
 2/2 1 forwarding 19 32 disabled
 2/3 1 not-connected 100 32 disabled
 2/4 1 not-connected 100 32 disabled
 2/21 1 not-connected 100 32 disabled
 2/22 1 not-connected 100 32 disabled
 2/23 1 not-connected 100 32 disabled
 2/24 1 not-connected 100 32 disabled
 3/1 1 not-connected 100 32 disabled
 3/2 1 not-connected 100 32 disabled
 3/3 1 not-connected 100 32 disabled
 3/4 1 not-connected 100 32 disabled
 3/5 1 not-connected 100 32 disabled
 3/6 1 not-connected 100 32 disabled
 3/7 1 not-connected 100 32 disabled
 3/8 1 not-connected 100 32 disabled
 3/9 1 not-connected 100 32 disabled
 3/10 1 not-connected 100 32 disabled
 3/11 1 not-connected 100 32 disabled
 3/12 1 not-connected 100 32 disabled
 5/1 1 not-connected 4 32 disabled
 5/3 1 not-connected 4 32 disabled
 5/4 1 not-connected 4 32 disabled
 5/5 1 not-connected 4 32 disabled
 5/6 1 not-connected 4 32 disabled
 5/7 1 not-connected 4 32 disabled
 5/8 1 not-connected 4 32 disabled
 5/9 1 not-connected 4 32 disabled
Console> (enable) q

Console> (enable) show spantree 3
VLAN 3
Spanning tree enabled
Spanning tree type ieee

Designated Root 00-10-1f-94-c0-02
Designated Root Priority 32768
Designated Root Cost 0
Designated Root Port 1/0
Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec

Bridge ID MAC ADDR 00-10-1f-94-c0-02 <=========== this address
!!!!!
Bridge ID Priority 32768
Bridge Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec

Port Vlan Port-State Cost Priority Fast-Start Group-Method
--------- ---- ------------- ----- -------- ---------- ------------
 2/5 3 forwarding 19 32 disabled
 2/6 3 not-connected 100 32 disabled
 2/7 3 not-connected 100 32 disabled
 2/8 3 not-connected 100 32 disabled
Console> (enable)

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