HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 75
Configuring a multicast forwarding range, Configuring the multicast forwarding table size
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Step 2. Configure the device to select the RPF route based on the longest match. Command multicast longest-match 3. Configure multicast load splitting. multicast load-splitting { source | source-group } Remarks The route with the highest priority is selected as the RPF route by default. Optional. Disabled by default. Configuring a multicast forwarding range Multicast packets do not travel without a boundary in a network. The multicast data corresponding to each multicast group must be transmitted within a definite scope. You can configure a forwarding boundary specific to a particular multicast group on all interfaces that support multicast forwarding. A multicast forwarding boundary sets the boundary condition for the multicast groups in the specified range. If the destination address of a multicast packet matches the set boundary condition, the packet will not be forwarded. After you configure an interface as a multicast boundary, the interface can no longer forward multicast packets-including packets sent from the local device-or receive multicast packets. To configure a multicast forwarding range: Step 1. Enter system view. 2. Enter interface view. 3. Configure a multicast forwarding boundary. Command system-view interface interface-type interface-number multicast boundary group-address { mask | mask-length } Remarks N/A N/A No forwarding boundary by default. Configuring the multicast forwarding table size The switch maintains the corresponding forwarding entry for each multicast packet that it receives. Excessive multicast routing entries, however, can exhaust the switch's memory and cause lower performance. You can set a limit on the number of entries in the multicast forwarding table based on the networking situation and the performance requirements. If the configured maximum number of multicast forwarding table entries is smaller than the current value, the forwarding entries in excess are not deleted immediately. Instead, the multicast routing protocol that runs on the switch deletes them. The switch no longer adds new multicast forwarding entries until the number of existing multicast forwarding entries comes down below the configured value. When forwarding multicast traffic, the switch replicates a copy of the multicast traffic for each downstream node and forwards the traffic. Therefore, each of these downstream nodes forms a branch of the multicast distribution tree. You can configure the maximum number of downstream nodes (the maximum number of outgoing interfaces), for a single entry in the multicast forwarding table to lessen the burden on the switch for replicating multicast traffic. If the configured maximum number of downstream nodes for a single multicast forwarding entry is smaller than the current number, the downstream nodes in excess are not deleted immediately. Instead, the multicast routing protocol that runs on the switch deletes them. The switch no longer adds new multicast forwarding entries for newly added downstream nodes until the number of existing downstream nodes comes down below the configured value. 64