HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 280
Adjusting MLD performance, Configuration prerequisites
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Step 2. Enter interface view. 3. Configure the maximum number of IPv6 multicast groups that the interface can join. Command interface interface-type interface-number mld group-limit limit Remarks N/A 1000 by default. NOTE: This configuration takes effect for dynamically joined IPv6 multicast groups but not the statically configured multicast groups. Adjusting MLD performance For the configuration tasks in this section: • In MLD view, the configuration is effective globally. In interface view, the configuration is effective only on the current interface. • If the same function or parameter is configured in both MLD view and interface view, the configuration performed in interface view is given priority, regardless of the configuration order. Configuration prerequisites Before adjusting MLD performance, complete the following tasks: • Enable IPv6 forwarding and configure an IPv6 unicast routing protocol so that all devices in the domain can be interoperable at the network layer. • Configure basic MLD functions. • Determine the startup query interval. • Determine the startup query count. • Determine the MLD query interval. • Determine the MLD querier's robustness variable. • Determine the maximum response delay of MLD general query messages. • Determine the MLD last listener query interval. • Determine the MLD other querier present interval. • Determine the DSCP value for MLD messages. Configuring Router-Alert option handling methods MLD queries include multicast-address-specific queries and multicast-address-and-source-specific queries, and IPv6 multicast groups change dynamically, so a device cannot maintain the information for all IPv6 multicast sources and groups. Therefore, a router might receive IPv6 multicast packets addressed to IPv6 multicast groups that have no members on the local subnet. In this case, the Router-Alert option carried in the IPv6 multicast packets is useful for the router to determine whether to deliver the IPv6 multicast packets to the upper-layer protocol for processing. For more information about the Router-Alert option, see RFC 2113. An MLD message is processed differently depending on whether it carries the Router-Alert option in the IPv6 header, as follows: 269
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