assuming my wireless client IP subnets are created on a non-VSS, stack, or SVL device.
FHRP is realized using HSRP.
So in my wireless VLAN, there are link-local Multicast messages for the group address 18.104.22.168 (HSRPv2).
If I have Multicast support enabled on the WLC, these HSRP packets are encapsulated in CAPWAP (Multicast) and sent to all APs (right?!).
I guess IGMP snooping is not applicable to these addresses, right?
My "fear" is, that these HSRP Multicast frames are sent to all wireless clients. The problem is, that the Multicast frames are sent at a non-HT rate (highest mandatory data rate) and will potentially pollute the air.
So my questions are:
- Are the HSRP packets encapsulated into CAPWAP by the WLC and sent to the APs? (assuming Multicast forwarding is enabled)
- If yes (so the HSRP packets reach the APs)... are the packets sent to the air?
I didn't test this yet. I just want to understand the theory behind this and the documentation state.
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