HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 234
Setting the maximum number of multicast groups that a port can join
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With the MLD report suppression function enabled, within a query interval, the Layer 2 switch forwards only the first MLD report for the IPv6 multicast group to the Layer 3 device. It does not forward subsequent MLD reports for the same IPv6 multicast group to the Layer 3 device. This helps reduce the number of packets being transmitted over the network. On an MLD snooping proxy, MLD reports for an IPv6 multicast group from downstream hosts are suppressed if the forwarding entry for the multicast group exists on the proxy, whether the suppression function is enabled or not. To configure MLD report suppression: Step 1. Enter system view. 2. Enter MLD-snooping view. 3. Enable MLD report suppression. Command system-view mld-snooping report-aggregation Remarks N/A N/A Enabled by default Setting the maximum number of multicast groups that a port can join You can set the maximum number of IPv6 multicast groups that a port can join to regulate the traffic on the port. When you configure this maximum number, if the number of IPv6 multicast groups the port has joined exceeds the configured maximum value, the system deletes all the forwarding entries for the port from the MLD snooping forwarding table, and the hosts on this port join IPv6 multicast groups again until the number of IPv6 multicast groups that the port joins reaches the maximum value. When the port joins an IPv6 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 configure the maximum number of IPv6 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 IPv6 multicast groups that a port can join. Command system-view interface interface-type interface-number mld-snooping group-limit limit [ vlan vlan-list ] Remarks N/A Use either command. 1000 by default. Enabling IPv6 multicast group replacement For various reasons, the number of IPv6 multicast groups that a switch or a port can join might exceed the upper limit. In addition, in some specific applications, an IPv6 multicast group that the switch newly joins must replace an existing IPv6 multicast group automatically. A typical example is channel switching. To view a new TV channel, a user switches from the current IPv6 multicast group to the new one. 223