Troubleshooting Igmp Snooping - HP A8800 Configuration Manual

Troubleshooting IGMP snooping

Layer 2 multicast forwarding cannot function
Symptom
Layer 2 multicast forwarding cannot function.
Analysis
IGMP snooping is not enabled.
Solution
1. Use the display current-configuration command to view the running status of IGMP snooping.
2. If IGMP snooping is not enabled, use the igmp-snooping command in system view to enable IGMP
snooping globally, and then use the igmp-snooping enable command in VLAN view to enable
IGMP snooping for the VLAN.
3. If IGMP snooping is enabled globally but not enabled for the VLAN, use the igmp-snooping enable
command in VLAN view to enable IGMP snooping for the VLAN.
Configured multicast group policy fails to take effect
Symptom
Although a multicast group policy has been configured to allow hosts to join specific multicast groups, the
hosts can still receive multicast data addressed to other multicast groups.
Analysis
The ACL rule is incorrectly configured.
•
The multicast group policy is not correctly applied.
•
• The function of dropping unknown multicast data is not enabled, so unknown multicast data is
flooded.
Solution
1. Use the display acl command to check the configured ACL rule. Make sure that the ACL rule
conforms to the multicast group policy to be implemented.
Use the display this command in IGMP-snooping view or in the corresponding interface view to
2.
verify that the correct multicast group policy has been applied. If not, use the group-policy or
igmp-snooping group-policy command to apply the correct multicast group policy.
3. Use the display current-configuration command to verify that the function of dropping unknown
multicast data is enabled. If not, use the drop-unknown or igmp-snooping drop-unknown
command to enable the function of dropping unknown multicast data.
46