[c-nsp] Load Balancing T1s on 2611

[McLean Pickett]

Use the show ip cef commanf to verify that the CEF table has the two
default route entries. Have you cleared the CEF table since adding the
ip load sharing commands? You should have this command configured in 4
places, both local and both remote serial interfaces. May be worth doing
a CEF bug scrub for your IOS release. I have had issues with CEF per
packet load balancing on 26xx's before.

You can also go to a multlink interface (my preference).


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Voll, Scott
Sent: Friday, July 22, 2005 1:11 PM
To: Roger Weeks; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] Load Balancing T1s on 2611

Have you put the load-sharing per-packet on both sides of the t1's, not
just the cable side?

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Roger Weeks
Sent: Friday, July 22, 2005 10:03 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Load Balancing T1s on 2611

We provide the internet access for a local cable franchise, and due to
demand have recently installed a second T1 for more bandwidth.

I have successfully done T1 load-sharing before on 1721 and 7206
routers, but I am having a real problem getting it working on the
2611 that we have in place at the cable head-end.

I've got IOS 12.2.29 running on it, with IP PLUS 3DES features (to
support SSH and CEF).  It's got 64MB of DRAM.

Here's what I've done:

ip cef
ip load-sharing per-packet (on the serial interfaces)

dual ip route 0.0.0.0 0.0.0.0 upstream router entries

This is all we've done before to get load sharing working.  However,
looking at the bandwidth utilization on the T1s, the old T1 is taking
all the load except for about 20-40k on average on the new T1.

Any suggestions appreciated.

--
Roger J. Weeks
Systems & Network Administrator
Mendocino Community Network

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