RE: Root Bridge

This forum is for CCIE Lab candidates who have already passed written exam.

I seriously suggest you go back and review the theory of spanning-tree a little more. The fact you are unsure of this reveals key gaps in your knowledge that will cause you to have issues on the lab.

In short to answer your question, Was Vlan 3 created in SWA's database?

SWA#Show vlan

-Joe

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Tony claros
Sent: Monday, April 11, 2011 5:32 PM
To: Cisco certification
Subject: Root Bridge

Hi

Switch A being Server and got Spanning-tree priority 0 Switch B is client There is dot1q trunk between Switch A and Switch B

Why do switch B indicates Root bridge for: VLAN0003

SWA# sh spanning-tree sum
Switch is in pvst mode
Root bridge for: VLAN0009, VLAN0010, VLAN0020, VLAN0030, VLAN0040-VLAN0041
Extended system ID is enabled
Portfast Default is enabled
PortFast BPDU Guard Default is disabled Portfast BPDU Filter Default is enabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0009 0 0 0 6 6
VLAN0010 0 0 0 6 6
VLAN0020 0 0 0 6 6
VLAN0030 0 0 0 1 1
VLAN0040 0 0 0 6 6
VLAN0041 0 0 0 6 6
---------------------- -------- --------- -------- ---------- ----------
6 vlans 0 0 0 31 31

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SWB# sh spanning-tree sum
Switch is in pvst mode
Root bridge for: VLAN0003
Extended system ID is enabled
Portfast Default is enabled
PortFast BPDU Guard Default is disabled Portfast BPDU Filter Default is enabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0003 1 0 0 0 1
VLAN0009 1 0 0 5 6
VLAN0010 1 0 0 5 6
VLAN0020 1 0 0 5 6
VLAN0030 1 0 0 5 6
VLAN0040 1 0 0 5 6
---------------------- -------- --------- -------- ---------- ----------
6 vlans 6 0 0 25 31

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Received on Mon Apr 11 2011 - 21:50:59 ART