topic Re: Cisco WLC LAG in Wireless

Cisco WLC LAG

NetworkGuy! — Mon, 05 Jul 2021 17:58:03 GMT

Hello all

we have CIsc 5520 in LAG mode on the controller - does it need port-channelling on the switch end? it goes to two different switches but the switches are in VSS mode (Cisco6800)

Re: Cisco WLC LAG

balaji.bandi — Mon, 09 Sep 2019 11:32:07 GMT

yes for high availability user port-channel, use different physical switch port in each physical switch (when VSS switch over occurs) you still have access.

Re: Cisco WLC LAG

Flavio Miranda — Mon, 09 Sep 2019 12:44:44 GMT

Actually, Port-channel is not required. Port-channel is a feature if you, eventually, needs more throughput in a given uplink. Instead 1 Giga or 10 Giga you can bound multiple interfaces and rise this number to up to 8 Giga or 80 Giga.

What is required on this case it interface in trunk mode so that you can split your traffic accordingly based on Vlans.

-If I helped you somehow, please, rate it as useful.-

Re: Cisco WLC LAG

NetworkGuy! — Mon, 09 Sep 2019 13:01:40 GMT

Thanks both

in the past i dont remember port-channeling so is this required or not?

no concern about bandwidth but just not sure if this is needed or not? because we see laptops flapping on logs on the core switch between one access point another?

Re: Cisco WLC LAG

Flavio Miranda — Mon, 09 Sep 2019 13:45:21 GMT

As I said, port-channel is required only if you need more bandwidth. What is required for your scenario is trunk mode on the interface and/or port-channel.

-If I helped you somehow, please, rate it as useful.-

Re: Cisco WLC LAG

NetworkGuy! — Mon, 09 Sep 2019 15:42:27 GMT

we are seeing flapping messages

28275320: Sep 9 17:21:28.132 GMT: %MAC_MOVE-SW1-4-NOTIF: Host d4e2.8011.af59 in vlan 10 is flapping between port Te1/1/17 and port Te2/1/17
28275356: Sep 9 17:26:40.374 GMT: %MAC_MOVE-SW1-4-NOTIF: Host d4e2.8011.af59 in vlan 10 is flapping between port Te1/1/17 and port Te2/1/17

Te1/1/17 is connected to WLC port 1 and Te2/1/17 is connected to WLC port 2 and in LAG mode

so does this need port-channeling in core switch? hence the question

Re: Cisco WLC LAG

balaji.bandi — Mon, 09 Sep 2019 16:49:26 GMT

We see the messages are normal as per my experience. until you see any issue here ?

Re: Cisco WLC LAG

NetworkGuy! — Mon, 09 Sep 2019 21:47:09 GMT

Thanks but why would these messages appear? if i port channel will these messages go away?

Re: Cisco WLC LAG

Rasika Nayanajith — Tue, 10 Sep 2019 00:02:47 GMT

"we have CIsc 5520 in LAG mode on the controller "

If you have LAG on WLC, then it is mandatory to use port channel config on your switch. Then those messages will go away

HTH

Rasika

*** Pls rate all useful responses ***

Re: Cisco WLC LAG

balaji.bandi — Tue, 10 Sep 2019 00:47:07 GMT

@Rasika Nayanajith

just want to know is the same case with 8K controllers ? can you point me, i do see that messages, when the client roaming ..not found that tip before. like to explore me to fix that.

Re: Cisco WLC LAG

Rasika Nayanajith — Tue, 10 Sep 2019 03:38:10 GMT

when you enable LAG on a WLC (any hardware model) & two ports of WLC connect to two different switchports (on a VSS pair or switch stack), you should bundle those ports into a port channel group at the switch end.

Those mac flapping messages should not be occur in that situation

HTH

Rasika

Re: Cisco WLC LAG

balaji.bandi — Tue, 10 Sep 2019 07:44:06 GMT

yes the ports are bundled, and we can see its bundled on switch side.

do we see any other config required on WLC side, as you mentioning on this post...

we see mac flapping while client roam doing.

Re: Cisco WLC LAG

NetworkGuy! — Thu, 12 Sep 2019 10:36:05 GMT

Thank you all

Enabling LAG helped mac flapping from one interface to another however we do see mac address notification on switch when client roams from AP to AP which is normal i guess

just which level of notification on switch logging will make these messages dissappear?

Thanks,

Re: Cisco WLC LAG

balaji.bandi — Fri, 13 Sep 2019 15:21:46 GMT

yes that is normal that what we see when we configured WLC 8K

glad it hel, and can we can make it as resoved.