300-430 · Question #246
What is an indication of having multiple wireless controllers within the same CAPWAP multicast group?
The correct answer is B. Multicast traffic is increased throughout the network.. When multiple wireless controllers share the same CAPWAP multicast group address, each controller independently floods multicast traffic to that group, causing a net increase in multicast traffic across the network.
Question
What is an indication of having multiple wireless controllers within the same CAPWAP multicast group?
Options
- AMulticast packets are rate-limited to 128 kbps.
- BMulticast traffic is increased throughout the network.
- CACL filtering are used on the first hop router on all VLANs.
- DCAPWAP packets are fragmented.
How the community answered
(47 responses)- A4% (2)
- B70% (33)
- C9% (4)
- D17% (8)
Why each option
When multiple wireless controllers share the same CAPWAP multicast group address, each controller independently floods multicast traffic to that group, causing a net increase in multicast traffic across the network.
Rate-limiting multicast to 128 kbps is a configured policy decision, not a symptom or indication of multiple WLCs sharing a CAPWAP multicast group.
In a CAPWAP multicast deployment, each WLC sends multicast packets addressed to the shared group address. If multiple controllers are configured with the same multicast group, every controller floods its own copy of multicast traffic into the network, resulting in duplicated and overall increased multicast traffic throughout the infrastructure.
ACL filtering on first-hop routers is a multicast control measure, not an observable indication that multiple controllers belong to the same CAPWAP multicast group.
CAPWAP packet fragmentation is caused by MTU mismatches in the network path, not by the number of controllers sharing a multicast group.
Concept tested: CAPWAP multicast group traffic behavior with multiple WLCs
Source: https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/108589-multicast-wlc.html
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