An engineer is configuring multicast for two WLCs. The controllers are in different physical locations and each handles around 500 wireless clients. How should the CAPWAP multicast group address be assigned during configuration?
A.
Each WLC must be assigned a unique multicast group address.
B.
Each WLC management address must be in the same multicast group.
C.
Both WLCs must be assigned the same multicast group address.
D.
Each WLC management address must be in a different multicast group.
I think it is A:
Choose Controller > General to configure AP multicast mode (multicast or unicast) & CAPWAP multicast group address(only for multicast mode). Use private multicast IP (239.0.0.0/8) for the group address, but avoid 239.0.0.x or 239.128.0.x as these overlap with the link local MAC addresses & flood out all switch ports. This group address cannot be used for any application in your network. If you have multiple controllers, configure different group address for different controllers.
https://mrncciew.com/2012/11/17/configuring-multicast-on-wlc/
When configuring multicast for two Wireless LAN Controllers (WLCs) in different physical locations, each WLC should be assigned a unique multicast group address. Here’s why:
Unique Multicast Group Address:
Assigning a unique multicast group address to each WLC ensures that multicast traffic is localized to the specific WLC and its associated APs. This prevents unnecessary multicast traffic from being forwarded across the network to the other WLC, reducing network congestion and improving efficiency.
Why it’s important:
If both WLCs use the same multicast group address, multicast traffic from one WLC could be forwarded to the other WLC’s APs, even if those APs do not need the traffic. This would lead to inefficient use of network resources and increased overhead.
You can use an address from the range 239.0.0.0
through 239.255.255.255, but avoid 239.0.0.x and
239.120.0.x. If you need to configure multiple
controllers with multicast group addresses, make sure
each one gets a unique address.
A seems right according to this.
https://mrncciew.com/2012/11/17/configuring-multicast-on-wlc/#:~:text=If%20you%20have%20multiple%20controllers%2C%20configure%20different%20group%20address%20for%20different%20controllers.
It is also important that the multicast IP address be set to a
different value on each WLC.
https://www.cisco.com/c/en/us/td/docs/wireless/technology/5760_deploy/CT5760_Controller_Deployment_Guide/Multicast_Configuration.pdf
A should be right. WLC mngt address send 1 copy to an unique multicast address. You always need an unique addresses to avoid conflicts with other existing multicast adresses for example 224.0.0.13 All PIM Routers
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