Hello,
I have a 9800-80 (HA Pair) running 17.9.4a code. We've observed intermittent delays with vocera broadcasts. Media-Stream multicast direct is disabled on all the WLANs. "show ap multicast mom" command shows the AP as "up" for the multicast communication from the AP to the WLC Multicast IP. I can observe the groups on the WLC with the command "show ip igmp snooping groups" when the button is pressed for broadcast. I can also see with packet captures from the WLC and the AP switchport the clients that need to receive the broadcasts send a IGMPv2 Membership to the AP, the AP forwards that on to the WLC. The packet captures on a "successful" broadcast show the WLC getting the traffic and immediately sending the RTP streams to the multicast IP address configured for the AP to use for the clients to receive the multicast traffic. On a "delayed" broadcast, I see the controller receives 3-4 IGMPv2 membership packets from the AP/wireless client, before I see the controller management IP start sending to the AP multicast stream. We did not have these issues with AireOS which me migrated off of in late January. The cpu usage for the WLC doesn't seem high. I've observed this on sites that are on different CPU from a Site tag perspective.
Pid PPid 5Sec 1Min 5Min Status Size Name
--------------------------------------------------------------------------------
18242 18234 39% 38% 40% R 2417912 wncd_4
17897 17889 38% 38% 37% S 1895356 wncd_1
17782 17774 19% 19% 19% S 1419496 wncd_0
18361 18353 16% 17% 17% S 1339508 wncd_5
18127 18119 14% 11% 11% S 1121224 wncd_3
18012 18004 13% 15% 16% S 1282176 wncd_2
18475 18468 7% 7% 7% S 1003204 wncd_6
18589 18583 0% 11% 11% S 1147836 wncd_7
Has anyone else experienced this issue? The delays seem to be coming from the WLC actually sending the stream to the AP multicast IP address. Any recommended commands I can run to troubleshoot this further?
