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Disabling a port from becoming a dynamic router port
The following problems might exist in a multicast access network:
• After receiving an IGMP general query or a PIM hello message from a connected host, a router
port becomes a dynamic router port. Before its timer expires, this dynamic router port receives all
multicast packets within the VLAN where the port belongs, and forwards them to the host, affecting
normal multicast reception of the host.
• In addition, the IGMP general query or PIM hello message that the host sends affects the multicast
routing protocol state on Layer 3 devices, such as the IGMP querier or DR election, and might
further cause network interruption.
To solve these problems, disable that router port from becoming a dynamic router port after the port
receives an IGMP general query or a PIM hello message, so as to improve network security and control
over multicast users.
Follow these steps to disable a port from becoming a dynamic router port:
To do... Use the command... Remarks
Enter system view
system-view —
Enter Ethernet interface view,
Layer 2 aggregate interface view,
or port group view
interface interface-type interface-
number
Required
Use either approach.
port-group manual port-group-
name
Disable the ports from becoming
dynamic router port
igmp-snooping router-port-deny [
vlan vlan-list ]
Required
By default, a port can become a
dynamic router port.
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
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