topic Re: Cisco 8540 and Aruba switch not properly "lagging" toget in Wireless

Cisco 8540 and Aruba switch not properly "lagging" together

Males — Thu, 02 Nov 2023 03:24:20 GMT

I have a 8540 I want to move from an older Cat6k to a new Aruba 8360. The 8540 is running an older train (8.3) and is configured as a LAG. Since there is no negociation or support for LACP or PAGP on the WLC, I've forced the LAG port on the Aruba side to be 'on' and not use LACP. The native vlan is allowed on the LAG on the switch side, and the config on the controller really wasn't changed.

A test putting using a single port on the WLC set on the Aruba switch as a trunk with all proper vlans allows the controller to communicate.

When in LAG, the channel is up and properly connected. We can even see the controller's mac for management on the port. However there is no communication.

Any advice (or experience/template to share) from your similar experiences?

(btw cases were opened on both sides but are not yet assigned)

Mae

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

Mark Elsen — Thu, 02 Nov 2023 07:29:53 GMT

- Check logs on both devices when the connection is made , also check this thread for hints :
https://community.arubanetworks.com/discussion/lacp-channel-between-aruba-s3548-and-cisco-3750

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

Males — Thu, 02 Nov 2023 07:38:35 GMT

Hi Marce!

I appreciate your reply. Bear in mind that there is no negotiation of speed nor channeling here, they are your plain vanilla 10G fiber links on Aruba. I have and will keep my eyes peeled to the logs, as you said, but so far they are very quiet.

Thanks

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

Mark Elsen — Thu, 02 Nov 2023 08:06:28 GMT

- Verify lag configuration on the 8540 with : show lag summary

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

Males — Thu, 02 Nov 2023 08:09:48 GMT

“Lag enabled”

😉

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

Mark Elsen — Thu, 02 Nov 2023 08:20:32 GMT

- Great info! (smile) ; you need to consider https://software.cisco.com/download/home/286284728/type/280926587/release/8.10.190.0
and check if it has an impact on the issue , the older release is a disadvantage , especially on aireos platforms which are gradually being out phased , and or latest/last release that they can run becomes recommended ,

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

eglinsky2012 — Thu, 02 Nov 2023 19:19:27 GMT

Is there an equivalent to "show etherchannel summary" to run on the Aruba switch and post the results? Along with the configuration of the aggregated interface and the individual interfaces?

Is Spanning Tree being used, and is it forwarding the required VLAN(s) out the LAG from the Aruba side?

FYI - We don't use a native VLAN on the trunks from the switch side. Just trunk mode with "switchport trunk allowed vlan x,y,z" (again, IOS syntax). It may or may not be applicable to your environment.

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

Rich R — Wed, 22 Nov 2023 01:33:30 GMT

https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/ports_and_interfaces.html#link-aggregation
Did you reboot (REQUIRED) after making any change to the LAG configuration on the WLC?
https://community.cisco.com/t5/wireless-mobility-knowledge-base/lag-link-aggregation/ta-p/3128669

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

Males — Wed, 22 Nov 2023 00:41:41 GMT

Ok you guys...so...I rolled back on the Cisco side but ran into issues with the Aruba MCs as well. After a very long fight, seems like I got the Arubas to work...

Thank you to all those who tried to help, very much appreciated.

Mae

Re: Cisco 8540 and Aruba switch not properly "lagging" toget

Males — Wed, 22 Nov 2023 00:42:09 GMT

It's running 8.3 so very very few options.