HP 6125G - Configuring IGMP Snooping Querier; Enabling IGMP Snooping Querier

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• 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.
To disable a port from becoming a dynamic router port:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
interface interface-type
interface-number
Use either command.
3. Disable the ports from
becoming dynamic router
port.
igmp-snooping router-port-deny
[ vlan vlan-list ]
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
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 delay for 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 that runs IGMP, a multicast router or Layer 3 multicast switch sends IGMP
queries, so that all Layer 3 multicast devices can establish and maintain multicast forwarding entries, in
order to forward multicast traffic correctly at the network layer. This router or Layer 3 switch is called the
"IGMP querier." For more information about IGMP querier, see "Configuring IGMP."
Ho
wever, a Layer 2 multicast switch does not support IGMP, and therefore cannot send general queries
by default. When you enable IGMP snooping querier on a Layer 2 switch in a VLAN where multicast
traffic is switched only at Layer 2 and no multicast routers are present, the Layer 2 switch sends IGMP
queries, so that multicast forwarding entries can be established and maintained at the data link layer.
To enable IGMP snooping querier:
Step Command Remarks
1. Enter system view.
system-view N/A