Troubleshooting Igmp; No Membership Information On The Receiver-Side Router - 3Com MSR 50 Series Configuration Manual

Troubleshooting IGMP

No Membership
Information on the
Receiver-Side Router
# Enable IP multicast routing on Router B, and enable IGMP (version 2) and
PIM-DM on Ethernet 1/0.
<RouterB> system-view
[RouterB] multicast routing-enable
[RouterB] interface ethernet 1/0
[RouterB-Ethernet1/0] igmp enable
[RouterB-Ethernet1/0] igmp version 2
[RouterB-Ethernet1/0] pim dm
[RouterB-Ethernet1/0] quit
# Enable IP multicast routing on Router C, and enable IGMP (version 2) and
PIM-DM on Ethernet 1/0.
<RouterC> system-view
[RouterC] multicast routing-enable
[RouterC] interface ethernet 1/0
[RouterC-Ethernet1/0] igmp enable
[RouterC-Ethernet1/0] igmp version 2
[RouterC-Ethernet1/0] pim dm
[RouterC-Ethernet1/0] quit
3 Verify the configuration
Use the display igmp interface command to view the IGMP configuration and
operation status on each router interface. For example:
# View IGMP information on Ethernet 1/0 of Router B.
[RouterB] display igmp interface ethernet 1/0
Ethernet1/0(10.110.2.1):
IGMP is enabled
Current IGMP version is 2
Value of query interval for IGMP(in seconds): 60
Value of other querier present interval for IGMP(in seconds): 125
Value of maximum query response time for IGMP(in seconds): 10
Querier for IGMP: 10.110.2.1 (this router)
Total 1 IGMP Group reported
Symptom
When a host sends a report for joining multicast group G, there is no membership
information of the multicast group G on the router closest to that host.
Analysis
The correctness of networking and interface connections directly affects the
■
generation of group membership information.
Multicast routing must be enabled on the router.
■
If the igmp group-policy command has been configured on the interface, the
■
interface cannot receive report messages that fail to pass filtering.
Troubleshooting IGMP 1129