2-26Total 1 IP Group(s).Total 1 IP Source(s).Total 1 MAC Group(s).Port flags: D-Dynamic port, S-Static port, C-Copy portSubvlan flags: R-Real VLAN, C-Copy VLANVlan(id):100.Total 1 IP Group(s).Total 1 IP Source(s).Total 1 MAC Group(s).Router port(s):total 1 port.GE1/0/2 (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):Attribute: Host PortHost port(s):total 2 port.GE1/0/3 (S)GE1/0/5 (S)MAC group(s):MAC group address:0100-5e01-0101Host port(s):total 2 port.GE1/0/3GE1/0/5As shown above, GigabitEthernet 1/0/3 and GigabitEthernet 1/0/5 on Switch C have become staticmember ports for multicast group 224.1.1.1.IGMP Snooping Querier Configuration ExampleNetwork requirementsz As shown in Figure 2-6, in a Layer 2–only network environment, two multicast sources Source 1and Source 2 send multicast data to multicast groups 224.1.1.1 and 225.1.1.1 respectively, Host Aand Host C are receivers of multicast group 224.1.1.1, while Host B and Host D are receivers ofmulticast group 225.1.1.1.z All the receivers are running IGMPv2, and all the switches need to run IGMP snooping version 2.Switch A, which is close to the multicast sources, is chosen as the IGMP-Snooping querier.z To prevent flooding of unknown multicast traffic within the VLAN, it is required to configure all theswitches to drop unknown multicast data packets.z Because a switch does not enlist a port that has heard an IGMP query with a source IP address of0.0.0.0 (default) as a dynamic router port, configure a non-all-zero IP address as the source IPaddress of IGMP queries to ensure normal creation of Layer 2 multicast forwarding entries.
