3com 5500-SI Manual De Usuario

IGMP Snooping 321

Note that:

■

You cannot set the isolate VLAN as a multicast VLAN.

■

One user port can belong to only one multicast VLAN.

■

The port connected to a user end can only be set as a hybrid port.

■

A multicast member port must belong to the same multicast VLAN with the router 
port. Or else, it cannot receive multicast packets.

■

When setting a multicast VLAN ID on the router port, you must define the port as 
a trunk port or a tag-carried hybrid port, or else no multicast member port in this 
multicast VLAN can receive multicast packets.

■

If a multicast member port needs to receive multicast packets forwarded by the 
router port but the router port does not belong to any multicast VLAN, you should 
remove the multicast member port from its multicast VLAN, or else it cannot 
receive multicast packets.

Execute 

 command in any view to display the running of the IGMP Snooping 

configuration, and to verify the effect of the configuration. Execute 

 command 

in user view to reset the IGMP Snooping statistic information. Execute 

 

command in user view to debug IGMP Snooping configuration.

Enable multicast VLAN

service-type multicast

Required

Exit the VLAN view

quit

—

Enter the view of the Ethernet 
port connected to the Layer 3 
switch

interface interface-type 
interface-num

—

Define the port as a trunk or 
hybrid port

port link-type { trunk | 
hybrid }

—

Set the VLAN IDs allowed for 
the Ethernet

port hybrid vlan vlan-id-list { 
tagged | untagged }

The multicast VLAN must be 
included and set as tagged.

port trunk pvid vlan vlan-id

Enter the view of the Ethernet 
port connected to a user 
device

interface interface-type 
interface-num

interface-type and 
interface-num are the interface 
type and interface number.

Define the port as a hybrid 
port

port link-type hybrid

Required

Set the VLAN IDs whose 
packets are allowed to pass the 
port

port hybrid vlan vlan-id-list { 
tagged | untagged }

Required

The multicast VLAN must be 
included and set as untagged.

Table 318   Configure multicast VLAN on Layer 2 switch (continued)

Table 319   Displaying and debugging IGMP Snooping

Display the information about 
current IGMP Snooping 
configuration

Display IGMP Snooping statistics of 
received and sent messages

Display IP/MAC multicast group 
information in the VLAN

display igmp-snooping group [ vlan vlanid ]

Reset the IGMP Snooping statistic 
information