Symptom
At a large enough scale of IGMP Proxy, after the mroutes age the igmp group remains and continually sends IGMP join messages despite not having an active receiver:
DB2(config-if)# sh ip mro
IP Multicast Routing Table for VRF "default"
(*, 232.0.0.0/8), uptime: 01:17:13, pim ip
Incoming interface: Null, RPF nbr: 0.0.0.0
Outgoing interface list: (count: 0)
DB2(config-if)# sh ip ig g
IGMP Connected Group Membership for VRF "default" - 1 total entries
Type: S - Static, D - Dynamic, L - Local, T - SSM Translated, H - Host Proxy
* - Cache Only
Group Address Type Interface Uptime Expires Last Reporter
235.0.0.1 H Vlan11 01:12:38 00:04:07 3.116.0.16
DB2(config-if)# sh ip igmp local-groups
IGMP Locally Joined Group Membership for VRF "default"
Group Address Source Address Type Interface Last Reported
235.0.0.1 2.1.121.175 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.121.176 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.122.194 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.123.92 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.123.93 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.123.224 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.124.100 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.125.64 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.125.196 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.126.94 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.122.62 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.122.63 H-proxy Vlan11 00:00:25
235.0.0.1 2.1.122.216 H-proxy Vlan11 00:00:25
--More--
DB2(config-if)# sh ip igmp local-groups | cou
9205
DB2(config-if)#
Conditions
Nexus 3000/9000 series
Running 9.3(3) or earlier, including 7.x
IGMP Host proxy configured with large scale of H-proxy groups
