From: simon hart (simon.hart@btinternet.com)
Date: Wed Apr 06 2005 - 15:44:41 GMT-3
Chad,
A similar topic on EIGRP metric adjustment with offset lists has been
discussed over the last couple of days on this list.
The key problem you have here is the figure you have in your offset list.
The offset list figure is added to the delay component of the composite
metric, therefore the route(s) you are referring to in acl 80 are having
the following calculation performed on them (accepting everything is at
default value)
CM = 256((10000000/BWslowest link) + (Sum of Delays + 5402880 )
It is entirely possible that the route is now does not fall within your
variance requirements.
You should perform a show eigrp topology to see what the metrics are
HTH
Simon
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of Chad
Hintz
Sent: 06 April 2005 15:34
To: ccielab@groupstudy.com
Subject: EIGRP unequal cost load balancing w/offset list
Hi all,
I have a issue at work that I can't seem to figure out.
It goes like this
6513----portchannel---7204-----2 t-1 to vegas
same 6513---portchannel--7206-1 t-1 to vegas
on the 6513 we have a variance of 2
So I created a acl that that matches all the routes to vegas on the 6513
then I looked from the 6513's perspective to one of those routes to see the
metric going to the 7204 and going to the 7206
since the 7204 has 2 T-1s I would like to have the load share have a 2 to 1
ratio with the 7206.
So I took the metric from the 6513 to the 7204 and multiplied it by 1.75 and
then subtracted the metric of the 7206 to see what i would have to add in
the offset list going to the 7206 to do this load sharing.
7204 default config
Route metric is 5002240, traffic share count is 1
7206
Route metric is 3351040 , traffic share count is 1
so my calculation is 5002240*1.75-3351040
and then the offset list adds 5402880 on the 6513 inbound from the 7206
offset-list 80 in 5402880 Vlan80
So when this is done and i do a sh ip ro for the vegas subnet it only shows
routes to the 7204!
Thanks in advance for any help.
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This archive was generated by hypermail 2.1.4 : Tue May 03 2005 - 07:54:54 GMT-3