From: Scott Vermillion (scott_ccie_list@it-ag.com)
Date: Wed Sep 03 2008 - 12:24:26 ART
Hey John,
EIGRP merely populates your routing table, which is in turn used to populate
your FIB. It's the switching path (all but certainly CEF) that you need to
be concerned with (and none that I can think of balance load based on source
IP only).
http://www-search.cisco.com/en/US/docs/ios/ipswitch/configuration/guide/cef_
load_balancng_ps6350_TSD_Products_Configuration_Guide_Chapter.html
http://www.cisco.com/en/US/tech/tk827/tk831/technologies_tech_note09186a0080
094806.shtml
Having said that, EIGRP is involved in load balancing to the extent that it
populates equal-cost or unequal-cost routes into the routing table to begin
with.
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009437d
.shtml
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094820
.shtml
Interestingly, if you do configure EIGRP for unequal-cost load balancing,
the path weighting >is< carried forward to the CEF hash bucket distribution
algorithm. I don't have a link to offer up on that, but you can buy or
borrow a copy of "Cisco Express Forwarding" (Cisco Press) and there you'll
find several pages that explain the relationship between EIGRP load
balancing and CEF hash buckets.
Cheers,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of john
white
Sent: Wednesday, September 03, 2008 3:09 AM
To: Cisco certification
Subject: EIGRP Loadbalancing - possible CCIE scenario
Hi Gents,
I believe EIGRP by default loadbalances based on source IP address. How does
one change this to probably loadbalance via destination IP.
Forexample, If I have two sites running EIGRP with multiple WAN links
between them. Hosts in site 1 access server in site 2 via EIGRP.
First Site has multiple hosts so loadbalancing via source is fine
Second site has only one Server that is accessed by multiple clients from
site 1. It would be better to loadbalance based on destination IP from this
site so all WAN links can be utilised.
or am i missing something?
Blogs and organic groups at http://www.ccie.net
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