From: Usankin, Andrew (Andrew.Usankin@twtelecom.com)
Date: Thu Aug 30 2007 - 19:57:45 ART
Keep in mind that IP CEF is turned on by default for IPv4 on most of
Cisco routers. And CEF has it's own algorithm for load sharing. By
default it performs per-source-destination load sharing. So if you are
testing from the same router you may never ever see traces walking over
another path. So if you want to make sure load balancing of your routing
protocol is achieved correctly, use per-packet load sharing (ip
load-sharing per-packet).
Andrew
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Travis Anderson
Sent: Thursday, August 30, 2007 3:29 PM
To: Cisco certification
Subject: Load balancing
GS,
When load balancing, how does a person verify packets don't load balance
between routers to a endpoint destination with any routing protocol.
For instance with EIGRP the variance command is used on 2 routers at a
remote site and the same subnet is entered in the routing table on both
routers. R1 receives 100 packets from a client, send 50 packets to
CentralLocationR1 and 50 packets to R2. Then R2 sends
25 packets to R1 and 25 packets to CentralLocationR2 from the received
50 packets. Is there some mechanism to stop packets from being load
balanced between each other? Or,is this a manual configuration and
design question?
R1
sh ip route
10.0.0.0/8 R2
10.0.0.0/8 CentralLocationR1
R2
sh ip route
10.0.0.0/8 R1
10.0.0.0/8 CentralLocationR2
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