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4.
Verify the configuration
After the configuration is completed, Host A and Host B send IGMP join messages for group 224.1.1.1.
Receiving the messages, Switch A sends a join message for the group out port GigabitEthernet 1/0/1—
a router port—to Router A.
Use the display igmp-snooping group command and the display igmp group command to display
information about IGMP snooping groups and IGMP multicast groups. For example:
# Display information about IGMP snooping groups on Switch A.
[SwitchA] display igmp-snooping group
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Port flags: D-Dynamic port, S-Static port, C-Copy port
Subvlan flags: R-Real VLAN, C-Copy VLAN
Vlan(id):100.
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Router port(s):total 1 port.
GE1/0/1 (D) ( 00:01:23 )
IP group(s):the following ip group(s) match to one mac group.
IP group address:224.1.1.1
(0.0.0.0, 224.1.1.1):
Host port(s):total 2 port.
GE1/0/3 (D)
GE1/0/4 (D)
MAC group(s):
MAC group address:0100-5e01-0101
Host port(s):total 2 port.
GE1/0/3
GE1/0/4
# Display information about IGMP multicast groups on Router A.
[RouterA] display igmp group
Total 1 IGMP Group(s).
Interface group report information of VPN-Instance: public net
GigabitEthernet1/0/1(10.1.1.1):
Total 1 IGMP Group reported
Group Address Last Reporter Uptime Expires
224.1.1.1 0.0.0.0 00:00:06 00:02:04
When Host A leaves the multicast group, it sends an IGMP leave message to Switch A. Receiving the
message, Switch A removes port GigabitEthernet 1/0/3 from the member port list of the forwarding
entry for the group; however, it does not remove the group or forward the leave message to Router A
because Host B is still in the group. Use the display igmp-snooping group command to display
information about IGMP snooping groups. For example:
# Display information about IGMP snooping groups on Switch A.
[SwitchA] display igmp-snooping group
Total 1 IP Group(s).
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