HA WiSM2 Deployment

[cisco_tac_cr]

I have the following business requierement:

I have 3x WiSM2 on Slot 2,3 and 4 on a 6509 Chassis 1 and the same setup for a second 6509. Currently I have 6 active WLCs on the network.

The requirement is to add HA and make 3 active and 3 on hot stand-by. The setup is on a Layer 2 network. My question is regarding if this setup is supported and if I should be aware of any gotchas?

Here's a diagram of the end goal.

Thanks in advance for the support.

[Leo Laohoo]

This can be done as long as both chassis are in a VSS pair & Management IP address of all the WiSM2 must be in the same subnet.

[cisco_tac_cr]

I'm planning on running 8.1 but no VSS mode. Possible?

[cisco_tac_cr]

and have all 3 WLC use the same redundancy VLAN

[Leo Laohoo]

but no VSS mode. Possible?

Nope.  Not possible.  

If it's non-VSS mode chassis, then the WiSM2 line cards must be in the same chassis.

[siarena]

Leo, this is possible on 7.5 release and later: http://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-1/HA_SSO_DG/High_Availability_DG.html#pgfId-78197

[Leo Laohoo]

Thanks for this.  I've never seen this in the wild before.  

[Freerk Terpstra]

I have build this configuration in the past with success using just one WiSM in both 6500's. The HA traffic between both WLC's should be strictly isolated in a L2 VLAN which is specified with the "wism redundancy-vlan" command.

As far as I know you can't configure this for a specific WiSM module so I'm wondering if this topology with multiple WiSM's pairs is actually supported...

[mohanak]

For WiSM2, the following three topologies are supported (similar to releases 7.3 and 7.4):

● Two WiSM-2 on the same chassis

● TwoWiSM-2on different chassis with redundancy VLAN extended over the Layer 2 network

● TwoWiSM-2on different chassis in VSS mode

http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1130-ag-series/qa_c67-714540.html

[siarena]

This is supported as per http://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-1/HA_SSO_DG/High_Availability_DG.html#pgfId-78197 from 7.5 release.

Hope it helps

Simone