t; As my curiosity grew I checked "Per-VLAN".
> Our closests are configured to look at one of the core switches
> as the root bridge, the other core as the secondary root
> bridge. I went to one of the closets and received the same
> output as above for "show spantree".
>
Hello Time 2 sec Forward Delay 15 sec
All the ports show as VLAN1.
--
As my curiosity grew I checked "Per-VLAN".
Our closests are configured to look at one of the core switches as the root
bridge, the other core as the secondary root bridge. I went to
neither liberty nor safety.
Benjamin Franklin, 1759
-Original Message-
From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]]
Sent: Thursday, July 11, 2002 2:21 PM
To: [EMAIL PROTECTED]
Subject:RE: All 0's MAC Root Bridge [7:48578]
Kim Graham wrote:
>
> The
Kim Graham wrote:
>
> The other day I was delving a bit into spanning tree and I came
> across something that puzzled me.
>
> Searching out which device was the root bridge I found the MAC
> address (BID) on the root bridge to be all zero's. (show
> spantree snippets
The other day I was delving a bit into spanning tree and I came across
something that puzzled me.
Searching out which device was the root bridge I found the MAC address (BID)
on the root bridge to be all zero's. (show spantree snippets).
Spanning tree mode PVST+
Spanning tree
servers in both VLANS. Cat-A
would be the root bridge for VLAN2 and all traffic would flow through it for
this VLAN. Same for Cat-B and VLAN3.However, lets assume that the link
between Cat-C and Cat-A fails. Now Cat-C can't send traffic directly to
Cat-A, but It can however send to Cat-B which can
Hi,
Studying Cisco LAN Switching,(by Hamilton & Clark), I didn't get how
exactly this method (Root Bridge placement load balancing)works. He
provides such an example (Figure 7-10): ___
|Cat-C (IDF)|
|___|
1/1 /
Switch2 is the root bridge. Bridge ID MAC ADDR and Designated Root are
identical, and cost is 0. Switch1's configuration is incorrect. Recheck
your VLAN and STP configurations.
HTH,
Evan
-Original Message-
From: Giggsy [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, January 02, 2001
Hi
Pls refer to my Switch1 Spanning Tree display. Is this my Root Bridge?
How come the MAC for Switch1 is 00-00-00-00-00-00?
Any problem with this switch? it is so different from Switch2 (pls refer to
the below)
Switch1 (enable) sh spantree
VLAN 1
Spanning tree enabled
Spanning tree type
Title: Root Bridge ?
A root
bridge is an essential part of the Spanning Tree Protocol. Once elected it is
the responsibility of the root bridge to send configuration BPDUs which flow out
from the root bridge and spread to every switch in the STP domain. In essence
the Root Bridge is the
Title: Root Bridge ?
Can anyone tell me what is a root-bridge and why and where it is used.
Thanks in advance.
Shaikh Raees Ahmed,
Microsoft Certified Systems Engineer,
Cisco Certified Network Associate,
Systems & Network,
IT Division.
Cripes !!!
Thanx for the reply.
So it looks like we have potential "Spanking Tree"
problems ahead. We are already rolling with Cat
6000/3500 into our new sites, so any old kit goes in
would mean that "spanking Tree" would not be
calculated correctly and could go "Loop the Loop".
Phil.
--
The costs have recently been altered. This is reflected in the Cisco
Catalyst switch IOS (except the 1900 series).
Link Speed Cost (reratified IEEE spec) Cost (previous IEEE spec)
---
10 Gbps 2
Hi,
Just happened on this studying for CIT.
Looking at how Root bridges calculate their respective
costs using 10^9/Bandwidth.
If the BW = 100Mbit/s then the cost = 10 i.e
10^9/100*10^6 = 10.
Presumably if using a Gigabit link to root then the
cost would be 1.
My question is what will happen
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