HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 34
Configuring 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: Step 1. Enter system view. 2. Enter Layer 2 Ethernet interface view or Layer 2 aggregate interface view. 3. Disable the ports from becoming dynamic router port. Command system-view interface interface-type interface-number Remarks N/A Use either command. 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." However, 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 1. Enter system view. Command system-view 23 Remarks N/A
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