3com S7906E インストール手順

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multicast routing-enable command in system view to enable IP multicast routing. In addition, 
check that IGMP is enabled on the corresponding interfaces.  
3)  Check the IGMP version on the interface. You can use the display igmp interface command to 
check whether the IGMP version on the interface is lower than that on the host.  
4)  Check that no ACL rule has been configured to restrict the host from joining the multicast group G. 
Carry out the display current-configuration interface command to check whether the igmp 
group-policy command has been executed. If the host is restricted from joining the multicast 
group G, the ACL rule must be modified to allow receiving the reports for the multicast group G.  
Inconsistent Memberships on Routers on the Same Subnet 
Symptom 
Different memberships are maintained on different IGMP routers on the same subnet.  
Analysis  
A router running IGMP maintains multiple parameters for each interface, and these parameters 
influence one another, forming very complicated relationships. Inconsistent IGMP interface 
parameter configurations for routers on the same subnet will surely result in inconsistency of 
memberships.  
In addition, although an IGMP router is compatible with a host that is running a different IGMP 
version, all routers on the same subnet must run the same version of IGMP. Inconsistent IGMP 
versions running on routers on the same subnet will also lead to inconsistency of IGMP 
memberships.  
Solution  
1)  Check the IGMP configuration. Carry out the display current-configuration command to view the 
IGMP configuration information on the interfaces.  
2)  Carry out the display igmp interface command on all routers on the same subnet to check the 
IGMP-related timer settings. Make sure that the settings are consistent on all the routers.  
3) Use 
the 
display igmp interface command to check whether all the routers on the same subnet are 
running the same version of IGMP.