HOW DETERMINE BRIDGE ID

[ROGER FERNANDO MAJO ZACARIAS]

Hello,

We have two switch cisco  3560 with the same default priotity STP of: 32768.

They have only one vlan configured Vlan 1 (default).

The BPDU will forward the best BRIDGE_ID:

• both switches have the same priority.
• but the switch with the less mac-address has the best BPDU.

How do you determine the less mac-address is they in HEXADECIMAL format?

Do you transform it to decimal or olny compare the last octect?

Waiting your sooner answer.

Attn.

Roger Majo

[Reza Sharifi · Accepted solution]

Hi Roger,

Compare both mac addresses from left to right.  Lowest number is 0 and the highest is F.

HTH

Reza

[ROGER FERNANDO MAJO ZACARIAS]

Reza,

For example, if the two mac-address are:

MAC_1:001c.0f17.68c0 y

MAC_2:0021.cc4a.70b4

MAC_1 will be the less mac-address so the associated BRIDGE_ID is the best?

0 with 0

0 with 0

1 with 2

Am I right?

Best regard.

Roger

[Jon Marshall · Accepted solution]

Roger

Yes you are right.

Jon