3Com Switch 7750 Configuration Guide

434 CHAPTER 43: IGMP SNOOPING CONFIGURATION
Configuring IGMP Snooping filtering ACLs for a port
n
■ One port can belong to multiple VLANs. Only one ACL rule can be configured
on each of the VLANs to which the port belongs.
■ If the port does not belong to the VLAN where the command is configured, the
configured ACL rule does not take effect.
■ If no ACL rule is configured in the command, the multicast packets of all the
multicast groups are rejected.
Configuring to Limit
Number of Multicast
Groups on a Port
With a limit imposed on the number of multicast groups on the switch port, users
can no longer have as many multicast groups as they want when demanding
multicast group programs. Thereby, the bandwidth on the port is controlled.
Configuring IGMP
Snooping Querier
In an IP multicast network running IGMP, a multicast router is responsible for
sending IGMP general queries, so that all Layer 3 multicast devices can establish
and maintain multicast forwarding entries, thus to forward multicast traffic
correctly at the network layer. This router or Layer 3 switch is called IGMP querier.
Enable IGMP
Snooping filter in
system view
igmp-snooping
group-policy acl-number
[ vlan vlan-list ]
Required
■ You can configure the ACL to filter the IP
addresses of corresponding multicast
group.
■ By default, the multicast filtering feature
is disabled.
Table 343 Configure IGMP Snooping filtering ACLs for a port
Operation Command Description
Enter system view system-view -
Enter Ethernet port
view
interface interface-type
interface-number
-
Configure the
multicast filtering
feature for the port
igmp-snooping
group-policy acl-number
[ vlan vlan-list ]
Required
■ You can configure the ACL to filter the IP
addresses of corresponding multicast
group.
■ By default, the multicast filtering feature
is disabled.
Table 342 Configure IGMP Snooping filtering ACLs globally
Operation Command Description
Table 344 Configure to limit number of multicast groups on a port
Operation Command Description
Enter system view system-view -
Enter Ethernet port view interface interface-type
interface-number
-
Configure the number of
multicast groups on a port
igmp-snooping group-limit
limit [ vlan vlan-list
[ overflow-replace ] |
overflow-replace ]
Optional
The number of multicast
groups on a port is 256