88multicast groups in the specified range. If the destination address of a multicast packet matches the setboundary condition, the packet will not be forwarded. After you configure an interface as a multicastboundary, the interface can no longer forward multicast packets—including packets sent from the localdevice—or receive multicast packets.To configure a multicast forwarding range:Step Command Remarks1. Enter system view. system-view N/A2. Enter interface view. interface interface-typeinterface-number N/A3. Configure a multicastforwarding boundary.multicast boundary group-address{ mask | mask-length }No forwarding boundary bydefault.Configuring the multicast forwarding table sizeThe 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 lowerperformance. You can set a limit on the number of entries in the multicast forwarding table based on thenetworking situation and the performance requirements. If the configured maximum number of multicastforwarding table entries is smaller than the current value, the forwarding entries in excess are not deletedimmediately. Instead, the multicast routing protocol that runs on the switch deletes them. The switch nolonger adds new multicast forwarding entries until the number of existing multicast forwarding entriescomes down below the configured value.When forwarding multicast traffic, the switch replicates a copy of the multicast traffic for eachdownstream node and forwards the traffic. Therefore, each of these downstream nodes forms a branchof the multicast distribution tree. You can configure the maximum number of downstream nodes (themaximum number of outgoing interfaces), for a single entry in the multicast forwarding table to lessen theburden on the switch for replicating multicast traffic. If the configured maximum number of downstreamnodes for a single multicast forwarding entry is smaller than the current number, the downstream nodesin excess are not deleted immediately. Instead, the multicast routing protocol that runs on the switchdeletes them. The switch no longer adds new multicast forwarding entries for newly added downstreamnodes until the number of existing downstream nodes comes down below the configured value.Configuring the multicast forwarding table size for the public networkStep Command Remarks1. Enter system view. system-view N/A2. Configure the maximumnumber of entries in themulticast forwarding table.multicast forwarding-tableroute-limit limitOptional.2000 by default.
