H3C Technologies H3C S3100V2 Series Switches - Manual (Page 32)

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To solve these problems, disable that switch port from changing into a dynamic router port upon
receiving an IGMP general query or a PIM Hello message, so that network security and control over
multicast users are enhanced.
Follow these steps to disable a port or a group of ports from changing into dynamic router ports:
To do... Use the command... Remarks
Enter system view system-view —
interface interface-type
interface-number
Enter Ethernet interface/Layer 2
aggregate interface view or port
group view
port-group manual
port-group-name
Required
Use either approach.
Disable the port or group of ports
from changing into dynamic router
ports
igmp-snooping router-port-deny
[ vlan vlan-list ]
Required
By default, the port or group of
ports can change into dynamic
router ports.
NOTE:
This configuration does not affect the static router port configuration.
Configuring IGMP snooping querier
Configuration prerequisites
Before you configure IGMP snooping querier, complete the following tasks:
• Enable IGMP snooping in the VLAN
• Determine the IGMP general query interval
• Determine the IGMP last-member query interval
• Determine the maximum response time to IGMP general queries
• Determine the source address of IGMP general queries
• Determine the source address of IGMP group-specific queries
Enabling IGMP snooping querier
In an IP multicast network running IGMP, a multicast router or Layer 3 multicast switch is responsible for
sending IGMP general queries, so that all Layer 3 multicast devices can establish and maintain multicast
forwarding entries to forward multicast traffic correctly at the network layer. This router or Layer 3 switch
is called “IGMP querier.”
However, a Layer 2 multicast switch does not support IGMP, and cannot send general queries by default.
By enabling IGMP snooping on a Layer 2 switch in a VLAN where multicast traffic needs to be Layer-2
switched only and no multicast routers are present, the Layer 2 switch will act as the IGMP snooping
querier to send IGMP queries, allowing multicast forwarding entries to be established and maintained at
the data link layer.