3Com Switch 4800G 24-Port - IGMP Snooping Configuration Examples

570 CHAPTER 42: IGMP SNOOPING CONFIGURATION
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■ The reset igmp-snooping group command works only on an IGMP
Snooping-enabled VLAN, but not on a VLAN with IGMP enabled on its VLAN
interface.
■ The reset igmp-snooping group command cannot clear IGMP Snooping
forwarding table entries for static joins.
IGMP Snooping
Configuration
Examples
Configuring Simulated
Joining
Network requirements
■ As shown in Figure 172, Router A connects to the multicast source through
GigabitEthernet 1/0/2 and to Switch A through GigabitEthernet 1/0/1. Router
A is the IGMP querier on the subnet.
■ IGMP is required on Router A, IGMP Snooping is required on Switch A, and
Router A will act as the IGMP querier on the subnet.
■ Perform the following configuration so that multicast data can be forwarded
through GigabitEthernet 1/0/3 and GigabitEthernet 1/0/4 even if Host A and
Host B temporarily stop receiving multicast data for some unexpected reasons.
Network diagram
Figure 172 Network diagram for simulated joining configuration
View the statistics information of
IGMP messages learned by IGMP
Snooping
display igmp-snooping statistics Available in
any view
Clear IGMP Snooping multicast
group information
reset igmp-snooping group
{ group-address | all } [ vlan vlan-id ]
Available in
user view
Clear the statistics information of
all kinds of IGMP messages
learned by IGMP Snooping
reset igmp-snooping statistics Available in
user view
To do… Use the command… Remarks
Source
Router A Switch A
Receiver
Receiver
Host B
Host A
Host C
1.1.1.1/24
GE1/0/4
GE1/0/2
GE1/0/3
IGMP querier
GE1/0/1
GE1/0/1
10.1.1.1/24
GE1/0/2
1.1.1.2/24
Vlan100