Comments on: LACP Configuration Examples (Part 1)

By: Michael McNamara

Michael McNamara — Fri, 18 Nov 2011 17:21:16 +0000

Hi Sayantani,

Have you configured/enabled LACP on the CSB4624? You need to configure/enable LACP on both devices before it will start working.

Good Luck!

By: sayantani sarkar

sayantani sarkar — Thu, 17 Nov 2011 17:31:09 +0000

Hi Michael

i have done the config in 8600 as u have mentioned above . but whenever am connecting with CSB4624 , the vlans and ports are getting removed from LAG and LACP status is also showing down in 8600 . but with other nortel 5520 it is working fine . what might be the reason for this.

By: Michael McNamara

Michael McNamara — Thu, 17 Nov 2011 15:56:54 +0000

Hi Sayantani,

As long as the device in question (CSB4624) supports LACP then it should work fine.

Cheers!

By: sayantani sarkar

sayantani sarkar — Thu, 17 Nov 2011 08:13:15 +0000

Hi Michael, thanx for your guide , it was really helpfull.

one more thing i would like to ask you is , if i want to connect CSB4624 CPCI diversified technology MPIO switch through LACP , will this configuration work for that also.

By: Servo

Servo — Mon, 11 Jul 2011 13:23:45 +0000

Hi Michael, thanks for the guide

I have used this guide to create 4 LACP trunks on a Nortel 5520 stack, but although I have used the same commands for all four trunks, two of the trunks have configured correctly (show lacp port command as above shows all fields filled in) however on two others the show lacp port command shows the AggrId 0, and Trunk ID and Partner Port are blank. The switches are remote so I haven’t actually tried if they’re working, but could you please let me know if this corect?

By: Michael McNamara

Michael McNamara — Wed, 15 Jun 2011 17:53:43 +0000

Thanks for the comment AZ.

It probably correlates with the state of the LACP group… up… down… etc… you’d probably need to test to verify the options.

Good Luck!

By: AZ

AZ — Wed, 15 Jun 2011 11:38:17 +0000

Hi Michel,
I have a question regarding troubleshooting LACP in Nortel 8600 relese 5.1.2.0
in the logs I found this Msg
LACP INFO Aggregation Link State Change Trap (mltId=8, trapEvent=3)
In the “trapevent” field Do you know what the integer number represents?
I tried to google and searching through Nortel documents with no success

Thanks in Advance

By: vereten0

vereten0 — Thu, 22 Jul 2010 14:39:30 +0000

Thanks Michael

By: FLyolic

FLyolic — Fri, 21 May 2010 14:06:12 +0000

Hi Michael!
I’m still use Nortel’s proprietary MLT/SMLT/SLT too. And it’s working fine on the Nortel’s switches.
But now i want to connect Cisco 2960 (and 3550) and Passport8600. And i trap one thing: on the Passport Switch i can add the VLAN`s on ports (which are joined by LAG) ONLY BEFORE joining ports!
How I can add the additional VLANs for the working LAG – ports on the Passport 8600 (with sw.3.7.17)?

By: Michael McNamara

Michael McNamara — Mon, 11 Jan 2010 23:51:10 +0000

Hi Rajesh,

All links that participate in a LAG (Link Aggregation Group) run the LACP protocol. Depending on how one of the links fails both switches will eventually discover the issue and move all traffic to the remaining working link(s).

Here’s a great write-up regarding LAG and LACP;
http://www.ieee802.org/3/ad/public/mar99/seaman_1_0399.pdf

Good Luck!