3com 5500-ei pwr Reference Guide

 

5-23 

# Clear IGMP Snooping statistics.  

<Sysname> reset igmp-snooping statistics 

VLAN view 

None 

Use the service-type multicast command to configure the current VLAN as a multicast VLAN. 

Use the undo service-type multicast command to remove the current VLAN as a multicast VLAN. 

By default, no VLAN is a multicast VLAN. 

In an IGMP Snooping environment, by configuring a multicast VLAN and adding ports to the multicast 

VLAN, you can allow users in different VLANs to share the same multicast VLAN. This saves bandwidth 

because multicast streams are transmitted only within the multicast VLAN. In addition, because the 

multicast VLAN is isolated from user VLANs, this method also enhances the information security. 

 

z 

One port belongs to only one multicast VLAN. 

z 

The port connected to a user terminal must be a hybrid port. 

z 

The multicast member port must be in the same multicast VLAN with the router port. Otherwise, the 

port cannot receive multicast packets.  

z 

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. 

z 

If a multicast member port needs to receive multicast packets forwarded by a router port that does 

not belong to any multicast VLAN, the multicast member port must be removed from the multicast 

VLAN. Otherwise, the port cannot receive multicast packets.  

 

# Configure VLAN 2 as a multicast VLAN. 

<Sysname> system-view 

System View: return to User View with Ctrl+Z.