topic WLC 3504 Red. port in Wireless

WLC 3504 Red. port

ayakoleb — Mon, 05 Jul 2021 17:35:52 GMT

Hello ,

I have 2 WLC 3504 and need to connect the Redundancy ports -> I checked the deployment guide and found that they should connect back to back or via L2 switch , the question can I use L3 switch instead of L2 switch ?

thanks

Re: WLC 3504 Red. port

aogston — Fri, 21 Jun 2019 10:50:01 GMT

Hi. As far as I am aware, they must be on the same L2 domain. Best to connect back-to-back with a cable if possible. Sounds like you may struggle here though...

Regards,

Andy.

Re: WLC 3504 Red. port

ayakoleb — Fri, 21 Jun 2019 12:16:19 GMT

I cant connect them back to back .. and what do you mean same L2 domain .. do you mean that both of them connected to same L2 switch ?

Re: WLC 3504 Red. port

omz — Fri, 21 Jun 2019 12:17:15 GMT

Cisco suggests connecting back-to-back. They have to be in the same L2 domain as mentioned.

There are deployments where customers have WLCs in different DCs connected via dark fiber in the same L2 domain and it works fine as long as you have no packet loss. If there is packet loss the HA keepalives will go missing and the WLCs reboot to take over as active.

Hope this helps.

Re: WLC 3504 Red. port

aogston — Fri, 21 Jun 2019 12:50:17 GMT

Hi.

I have never had to do this, but yes, connect both WLC's to a L2 switch, and put them on a dedicated vlan.

Regards,

Andy.

Re: WLC 3504 Red. port

Haydn Andrews — Sun, 23 Jun 2019 22:54:21 GMT

The Redundancy port needs to be connected directly or via a L2 non-routed VLAN:

A Redundancy VLAN should be a Layer 2 VLAN dedicated for the HA Pairing process. It should not be spanned across networks and should not have any Layer 3 SVI interface. No data VLAN should be used as a Redundancy VLAN.

The switches can be layer 3 switches but the connection needs to be L2.

https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/7-5/High_Availability_DG.html