At this point, this is the only switch port joined to that multicast group, since Cisco routers never perform a join to this group (they simply use the multicast address). Subsequently, the switch stops forwarding to the other ports, including those to the routers.
This is correct IGMP behavior on the part of the switches.
The problem is that the Cisco routers no longer receive each other's HSRP/MSHRP packets, so the protocol cannot work properly.
Use these steps as a work-around for this behavior:
1. Configure HP switches to block or forward IP multicast traffic on individual ports, regardless of IGMP.
2. Specify Forward (as opposed to Auto or Blocked) in the switch's IGMP configuration on the ports which directly connect the two (M)HSRP routers.
This change causes the switch to forward all multicast traffic between those ports.
Note: This is a switch IGMP configuration item, not a switch Traffic/Security filter.
[责任编辑:editorforddvip]
相关链接本栏更新
