Displaying And Maintaining Igmp Snooping; Igmp Snooping Configuration Examples - 3Com E4500-24 Cli Configuration Manual

To do...
Specify the VLANs to be
allowed to pass the port
One port can belong to only one multicast VLAN.
The port connected to a user terminal must be a hybrid port.
The multicast member ports must be in the same VLAN with the router port. Otherwise, the
multicast member port cannot receive multicast packets.
If a router port is in a multicast VLAN, the router port must be configured as a trunk port or a hybrid
port that allows tagged packets to pass for the multicast VLAN. Otherwise, all the multicast
member ports in this multicast VLAN cannot receive multicast packets.
The multicast VLAN function and the VLAN mapping function cannot be configured at the same
time.

Displaying and Maintaining IGMP Snooping

To do...
Display the current IGMP
Snooping configuration
Display IGMP Snooping
message statistics
Display the information about
IP and MAC multicast groups in
one or all VLANs
Clear IGMP Snooping statistics

IGMP Snooping Configuration Examples

Configuring IGMP Snooping
Network requirements
To prevent multicast traffic from being flooded at Layer 2, enable IGMP snooping on Layer 2 switches.
As shown in
and to Switch A through Ethernet 1/0/1.
Run PIM-DM and IGMP on Router A. Run IGMP snooping on Switch A. Router A acts as the IGMP
querier.
The multicast source sends multicast data to the multicast group 224.1.1.1. Host A and Host B are
receivers of the multicast group 224.1.1.1.
Use the command...
port hybrid vlan vlan-id-list
{ tagged | untagged }
Use the command...
display igmp-snooping
configuration
display igmp-snooping
statistics
display igmp-snooping
group [ vlan vlan-id ]
reset igmp-snooping
statistics
Figure 3-3, Router A connects to a multicast source (Source) through Ethernet 1/0/2,
1-16
Remarks
Required
The multicast VLAN must be
included, and the port must be
configured to forward tagged
packets for the multicast VLAN.
Remarks
Available in any view
Available in any view
Available in any view
Available in user view