From: Pratt, Jeremy (JPratt@coh.org)
Date: Fri Jan 03 2003 - 14:09:01 GMT-3
Is the 2950 EMI or SMI? Are the links L2 or L3?
Etherchannel will not allow you to split the channel between the two 6509's,
you'll have spanning tree issues.
You could split the 2950 in half, ports 1-24 are Even and ports 25-48 are
odd. One 6509 would be the spanning tree root for the Odd and the other root
for the Even. The traffic would then be load shared between the two uplinks.
If you configured the 6509's with spanning tree secondary root then you
would also have failover redundancy in case one of the links or 6509's went
down all traffic would move to the remaining link.
If the 2950 is EMI L3 then you could run a basic routing protocol(not EIGRP,
OSPF, BGP2) or two static routes pointing to each of the 6500's and the
switch will allocate both uplinks on a per session basis. In this scenario
you would use HSRP for failover and HSRP interface tracking so you'll get 1
second failover as opposed to 10-40 seconds for spanning tree.
Jeremy Pratt
Network Manager
CCNP, CCDP, CCSA, CCSE
-----Original Message-----
From: Shadi [mailto:ccie@investorsgrp.com]
Sent: Friday, January 03, 2003 8:35 AM
To: ccielab@groupstudy.com
Subject: Bandwidth Aggregration?
Guys,
I would like to ask about a design related issue,
I have a 2950G-48 switch with two Gigabit fiber uplinks connected to two
different 6509 switches, each uplink is connected to each 6509 switch and
both switches 6509 are connected through Etherchannel 10Gbit. They are
forming a triangle.
I would like to aggregate the bandwidth between the two 2950G-48 Uplinks up
to 2 Gbps. So the switch 2950G-48, is connected to both switches with 2Gbit.
How can I do that? Can Cisco Etherchannel support termination to one chassis
from aside (2950G) and to two different chassis's from another side (2x
6509).
Any Ideas?
Shadi
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