3com 5500-SI Manual De Usuario

Common Multicast Configuration 323

Multicast forwarding table set up on the bottom layer is wrong. 

1 Enable IGMP Snooping group in user view and then input the command 

 to check if MAC multicast forwarding table in the bottom 

layer and that created by IGMP Snooping is consistent. You may also input the 

 command in any view to check if MAC multicast forwarding table 

under vlanid in the bottom layer and that created by IGMP Snooping is consistent.

2 If they are not consistent, refer to Technical Support for assistance. 

A common multicast configuration covers both the multicast group management 
protocol and the multicast routing protocol. The configuration includes enabling 
multicast, configuring the multicast forwarding boundary, and displaying the 
multicast routing table and multicast forwarding table.

Common multicast configuration includes:

■

Enabling multicast

■

Configuring the multicast route limit

■

Clearing MFC forwarding entries or statistics information

■

Clearing route entries from the core multicast routing table

Enable multicast first before enabling IGMP and the multicast routing protocol. 

Perform the following configuration in system view.

By default, multicast is disabled.

The number of multicast routing entries can be limited to prevent the router memory 
from being exhausted.

Perform the following configuration in System View.

By default, the multicast route-limit is 1000.

Table 320   Enabling multicast

Enable multicast

Disable multicast

Table 321   Configuring number limit of multicast routing entries

Configure number limit of multicast routing 
entries

multicast route-limit limit

Restore the default number limit