HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 40
Configuring IGMP report suppression
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Configuring IGMP report suppression When a Layer 2 switch receives an IGMP report from a multicast group member, the switch forwards the message to the Layer 3 device that directly connects to the Layer 2 switch. When multiple members of a multicast group are attached to the Layer 2 switch, the Layer 3 device might receive duplicate IGMP reports for the multicast group from these members. With the IGMP report suppression function enabled, within each query interval, the Layer 2 switch forwards only the first IGMP report for the multicast group to the Layer 3 device. It does not forward the subsequent IGMP reports for the same multicast group. This helps reduce the number of packets being transmitted over the network. IMPORTANT: On an IGMP snooping proxy, IGMP membership reports are suppressed if the entries for the corresponding groups exist in the forwarding table, no matter the suppression function is enabled or not. To configure IGMP report suppression: Step 1. Enter system view. 2. Enter IGMP-snooping view. 3. Enable IGMP report suppression. Command system-view igmp-snooping report-aggregation Remarks N/A N/A Enabled by default Setting the maximum number of multicast groups that a port can join To regulate multicast traffic on a port, configure the maximum number of multicast groups that the port can join. When you configure this maximum number, if the number of multicast groups the port has joined exceeds the configured maximum value, the system deletes all the forwarding entries for the port from the IGMP snooping forwarding table, and the hosts on this port join multicast groups again until the number of multicast groups that the port joins reaches the maximum value. When the port joins a multicast group, if the port has been configured as a static member port, the system applies the configurations to the port again. If you have configured simulated joining on the port, the system establishes corresponding forwarding entry for the port after receiving a report from the simulated member host. To set the maximum number of multicast groups that a port can join: Step 1. Enter system view. 2. Enter Layer 2 Ethernet interface view or Layer 2 aggregate interface view. 3. Set the maximum number of multicast groups that a port can join. Command system-view interface interface-type interface-number igmp-snooping group-limit limit [ vlan vlan-list ] Remarks N/A Use either command. 2000 by default. 29
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