Q1. How two wism work redundantly together when the host 6500 switches are configured to operate in VSS mode? Are they still indepent two controllers or are they becoming virtually one?
Q2. Use one 5508 as primary and 2504 as a backup for a small site (with enough licenses on each), do you foresee any problems? Do I just configure mobility domain same as how I configure on two 5508? Never configured a 2504 before...
If you have a wlc out at the site, that should be the primary in my opinion and that is what Leo is stating. Now you have to take in consideration during a failover, what will happen. If your APs are in local mode, the traffic will be placed on the interface that the WLAN is configured for. So this might mean that if APs fail from the wlc at the site to the 5508, devices will have to obtain a new ip address and vice Vera. If your APs are in FlexConnect mode, you can then define the WLAN to SSID mapping and during a failover, the FlexConnect AP will keep the SSID to VLAN mapping. There is much more that you need to make sure of, but that's what I have in a nutshell.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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