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When Host A leaves the multicast group, it sends an IGMP leave message to Switch A. Receiving the
message, Switch A removes port Ethernet 1/0/4 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).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Port flags: D-Dynamic port, S-Static port, C-Copy port, P-PIM port
Vlan(id):100.
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Router port(s):total 1 port.
Eth1/0/1 (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 1 port.
Eth1/0/3 (D)
MAC group(s):
MAC group address:0100-5e01-0101
Host port(s):total 1 port.
Eth1/0/3
Multicast source and user control policy configuration example
(available only on the HP 3100 v2 EI)
Network requirements
As shown in
, Switch A is a Layer-3 switch. Switch A runs IGMPv2 and Switch B runs IGMPv2
snooping. Multicast sources and hosts run 802.1X client.
A multicast source control policy is configured on Switch A to block multicast flows from Source 2 to
224.1.1.1.
A multicast user control policy is configured on Switch B so that Host A can join or leave only multicast
group 224.1.1.1.
