Cisco 8540 and Aruba switch not properly "lagging" together
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11-01-2023 08:24 PM
Hi
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)
TY
Mae
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11-02-2023 12:29 AM
- 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
M.
-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '
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11-02-2023 12:38 AM
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
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11-02-2023 01:06 AM
- Verify lag configuration on the 8540 with : show lag summary
M.
-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '
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11-02-2023 01:09 AM
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11-02-2023 01:20 AM
- 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 ,
M.
-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '
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11-02-2023 12:18 PM - edited 11-02-2023 12:19 PM
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.
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11-04-2023 09:01 AM - edited 11-21-2023 05:33 PM
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
Please click Helpful if this post helped you and Select as Solution (drop down menu at top right of this reply) if this answered your query.
------------------------------
TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
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11-21-2023 04:42 PM
It's running 8.3 so very very few options.
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11-21-2023 04:41 PM
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
