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Community Member

vlan info

Hi all, when I do sh spanning tree on my switch it gives me the output shown below, my question is, what is the root and bridge id ? is that the actual root switches info, and the bridge id is its own info ?

LAN0001

Spanning tree enabled protocol ieee

Root ID Priority 32768

Address 0002.16a4.0240

Cost 96

Port 22 (FastEthernet0/22)

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

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

Address 0012.d9fd.f100

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

Aging Time 15

1 REPLY
Cisco Employee

Re: vlan info

Hi,

Yes, the Root ID is the MAC address and Priority of the Root Bridge. The Bridge ID is the MAC address and Priority of the bridge that the show command was run on.

You may want to read these documents:

http://www.cisco.com/en/US/tech/tk389/tk390/technologies_tech_note09186a00800a7af3.shtml#spanningtrees

and

http://www.cisco.com/warp/customer/473/5.html

HTH,

Bobby

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