From: Andrew Harris (andharri) (andharri@cisco.com)
Date: Tue Dec 11 2007 - 12:44:36 ART
Personally I'd move the root for that VLAN to Cat2
What does everyone else think?
Andy
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Frank CCIE
Sent: 11 December 2007 15:41
To: Cisco certification; Cisco certification
Subject: How to configure etherchannel load-balance in the middle switch
Hi, Experts,
Assume there are 3 catalyst switches 3550 connected to each other in
triangle with Etherchannels. Cat1 is the root of spanning tree.
A workstation is linked to Cat3. The major user traffic is between the
workstation in Cat3 and the users in a Vlan in Cat2. In this topology,
the traffic goes from Cat3 ->Cat1 -> Cat2 and back from Cat2
-> Cat1 -> Cat3, because Cat1 is the root of the spanning tree.
Cat1
/ \
/ \
Cat2 --- Cat3
In Cat 3 :
port-channel load-balance dst-mac
In Cat 2:
Port-channel load-balance src-mac
My question is:
- How to configure etherchannel load-balance in the middle switch Cat1,
which is in the middle of traffic path?
- Should I change the Root switch to either Cat2 or Cat 3, to make the
traffic travels between Cat2 and Cat3 without passing Cat1 ? It will
use the etherchannel bandwidth more efficient.
Thanks in advance
Frank
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