Hello,
I am coming here because I can't find a satisfactory response by myself in cisco documentation.
In short, I have a CCTV network with many IP cameras in the same subnet than the receivers (operator for reading video).
- Each camera is sending a mulicast flow on the network.
- I configured IGMP snooping on every switch.
- Core switch is an H3C switch with PIM DM and igmp enabled
- Receivers are connected on core switch.
I attached a small picture to understand the installation. My question is about static Mrouter configuration. I was forced to configure static mrouter to downlink in order to have the multicast working on receiver.
ip igmp snooping vlan 150 mrouter interface Gi0/0
If I don't configure that, igmp report/join request from receiver are NOT reaching the farthest switch, and mulicast flow is not sended through the link between switch. This article is explaining something similar but not the same case :
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/68131-cat-multicast-prob.html
In other side, If I enable it, I am able to see all the multicast group on IGMP snooping table :
SW-SERV-TECH#sho ip igmp snooping groups
Vlan Group Type Version Port List
-----------------------------------------------------------------------
150 224.0.1.60 igmp v2 Gi0/23, Gi0/24,Gi1/1, Gi1/3
150 224.16.17.1 igmp v2 Gi0/23, Gi0/24,Gi1/1, Gi1/3
150 224.16.17.2 igmp v2 Gi0/23, Gi0/24,Gi1/1, Gi1/3
150 224.16.17.3 igmp v2 Gi0/23, Gi0/24,Gi1/1, Gi1/3
150 224.16.17.4 igmp v2 Gi0/23, Gi0/24,Gi1/1, Gi1/3
150 224.16.17.9 igmp v2 Gi0/23, Gi0/24,Gi1/1, Gi1/3
150 224.16.17.12 igmp v2 Gi0/23, Gi0/24,
And I suppose all mulicast flow are flooding through interswitch link, altough I didn't make frame capture to verify that.
So is it a normal behavior ? All is configured properly and this is the expected result ? Or I am missing something in this layer 2 network ?
Thanks in advance !
