158
Vlan(id):100.
Total 1 IP Group(s).
Total 1 IP Source(s).
Total 1 MAC Group(s).
Router port(s):total 1 port.
Eth1/1 (D) ( 00:01:30 )
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 Port
Host port(s):total 2 port.
Eth1/3 (D) ( 00:03:23 )
Eth1/4 (D) ( 00:04:10 )
MAC group(s):
MAC group address:0100-5e01-0101
Host port(s):total 2 port.
Eth1/3
Eth1/4
The output shows that Ethernet 1/3 and Ethernet 1/4 on Switch A have joined the multicast group
224.1.1.1.
Static port configuration example
Network requirements
As shown in
, IGMPv2 runs on Router A, and IGMPv2 snooping runs on Switch A, Switch B, and
Switch C, with Router A acting as the IGMP querier.
Host A and host C are permanent receivers of multicast group 224.1.1.1. Ethernet 1/3 and Ethernet 1/5
on Switch C should be configured as static member ports for multicast group 224.1.1.1 to enhance the
reliability of multicast traffic transmission.
Suppose the STP runs on the network. To avoid data loops, the forwarding path from Switch A to Switch
C is blocked under normal conditions, and multicast traffic flows to the receivers attached to Switch C
only along the path of Switch A—Switch B—Switch C. For more information about STP, see
Layer
2—LAN Switching Configuration Guide
.
Configure Ethernet 1/3 on Switch A as a static router port, so that multicast traffic can flow to the
receivers nearly uninterruptedly along the path of Switch A—Switch C in the case that the path of Switch
A—Switch B—Switch C is blocked.
NOTE:
If no static router port is configured, when the path of Switch A—Switch B—Switch C is blocked, at least one IGMP
query-response cycle must be completed before the multicast data can flow to the receivers along the new path of
Switch A—Switch C. Namely, multicast delivery is interrupted during this process.