Hi there,
I have been experiencing a problem recently where multicast traffic is being interrupted for up to a half second when IGMP membership queries are sent from the router. I noticed this problem only after introducing a distribution switch into my architecture, where previously the access switches were directly connected to the core device. I've attached a picture of my topology for reference.
Here is the output of show ip igmp interface, and show ip mroute for the group I'm using to troubleshoot the issue:
SAV-6506E-1#sh ip igmp interface vlan2
Vlan2 is up, line protocol is up
Internet address is 10.8.0.2/24
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 3
IGMP query interval is 60 seconds
IGMP configured query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP configured querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 18276 joins, 18134 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.8.0.2 (this system)
IGMP querying router is 10.8.0.2 (this system)
Multicast groups joined by this system (number of users):
224.0.1.40(1)
IGMP snooping is globally enabled
IGMP snooping CGMP-AutoDetect is globally enabled
IGMP snooping is enabled on this interface
SAV-6506E-1#sh ip mroute 224.1.2.130
...
(*, 224.1.2.130), 2d23h/stopped, RP 198.140.33.2, flags: SJC
Incoming interface: TenGigabitEthernet5/5, RPF nbr 10.5.8.25, Partial-SC
Outgoing interface list:
Vlan2, Forward/Sparse-Dense, 10:55:48/00:02:19, H
(159.125.73.5, 224.1.2.130), 07:46:58/00:02:55, flags: JT
Incoming interface: TenGigabitEthernet5/5, RPF nbr 10.5.8.25, RPF-MFD
Outgoing interface list:
Vlan2, Forward/Sparse-Dense, 07:46:58/00:02:19, H
Can anyone offer some tips on what I can try? I notice that the membership reports are IGMP v3... would changing to v2 make a difference?
Thanks in advance,
Brandon
