From: Feldman, Jim (Jim.Feldman@amex.com)
Date: Thu Oct 27 2005 - 16:19:04 GMT-3
Carlos,
I think the easiest what to understand this issue is through an example.
Suppose you had 2 switches, A and B, and you also had 2 vlans, 1 and 2.
Now, suppose you want to make Switch A the root bridge for vlan 1 and Switch
B the root bridge for vlan 2.
Without different BID's for each vlan, how would you do that?
Jim
-----Original Message-----
From: Carlos G Mendioroz [mailto:tron@huapi.ba.ar]
Sent: Thursday, October 27, 2005 3:15 PM
To: ccielab@groupstudy.com
Subject: OT: why many BIDs in PVST ?
For those that are wondering, yes I'm reading the BCMSN courseware :)
You know in STP there is a BID (Bridge ID) used to identify each
participating bridge and its priority.
Nowadays, also VLAN is used to make BIDs unique per VLAN, it used to be
the case that switches had many MACs just for that.
But, why do switches need different BIDs for different VLANs ?
-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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