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switch bridge ID

Hi,

How do I check which switch does the root ID mac address belong to? Also how do I list the MAC address of the vlan on a cat6509 switch. Thanks.

sample output from access switch

Root ID Priority 8192

Address 000e.d6d6.ac00

Cost 8

Port 49 (GigabitEthernet0/1)

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

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

Address 000f.9062.c3c0

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

Aging Time 300

sample output from 6509

Spanning tree mode RAPID-PVST+

Spanning tree type ieee

Spanning tree enabled

Designated Root 00-0e-d6-d6-ac-1f

Designated Root Priority 8192

Designated Root Cost 39

Designated Root Port 3/32

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

Bridge ID MAC ADDR 00-0e-d6-d6-a8-22

Bridge ID Priority 16384

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

on the output above I need to find out who 000e.d6d6.ac00 and 00-0e-d6-d6-ac-1f is.

Thanks

2 REPLIES
Silver

Re: switch bridge ID

Root ID is in the first secion:

Root ID Priority 8192

Address 000e.d6d6.ac00

---

Designated Root 00-0e-d6-d6-ac-1f

Designated Root Priority 8192

To check the mac address use show mac address-table, or show interface vlan "id" and you can see the MAC of the VLAN.

bye

FCS

Please rate me if I helped.

Re: switch bridge ID

Hi,

You need to follow the root port trail to get to the root bridge. In your case 3/32 is the root port. The switch connected to 3/32 could be your root or a designated bridge. If it is a designated bridge then follow it's root port towards the root.

Hope this helps!

Sundar

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