3com S7906E Manuel De Montage

 

1-6 

Follow these steps to configure an IPv6 multicast forwarding range:  

Enter system view 

— 

Enter interface view 

interface interface-type 
interface-number 

— 

Configure an IPv6 multicast 
forwarding boundary 

multicast ipv6 boundary 
ipv6-group-address 
prefix-length 

Required 

No forwarding boundary by 
default  

 

The router maintains the corresponding forwarding entry for each IPv6 multicast packet it receives. 

Excessive IPv6 multicast routing entries, however, can exhaust the router’s memory and thus result in 

lower router performance. You can set a limit on the number of entries in the IPv6 multicast forwarding 

table based on the actual networking situation and the performance requirements. If the configured 

maximum number of IPv6 multicast forwarding table entries is smaller than the current value, the 

entries in excess will not be immediately deleted; instead they will be deleted by the IPv6 multicast 

routing protocol running on the router. The router will no longer install new IPv6 multicast forwarding 

entries until the number of existing IPv6 multicast forwarding entries comes down below the configured 

value.  

When forwarding IPv6 multicast traffic, the router replicates a copy of the IPv6 multicast traffic for each 

downstream node and forwards the traffic, and thus each of these downstream nodes forms a branch of 

the IPv6 multicast distribution tree. You can configure the maximum number of downstream nodes 

(namely, the maximum number of outgoing interfaces) for a single entry in the IPv6 multicast forwarding 

table to lessen burden on the router for replicating IPv6 multicast traffic. If the configured maximum 

number of downstream nodes for a single IPv6 multicast forwarding entry is smaller than the current 

number, the downstream nodes in excess will not be deleted immediately; instead they must be deleted 

by the IPv6 multicast routing protocol. The router will no longer install new IPv6 multicast forwarding 

entries for newly added downstream nodes until the number of existing downstream nodes comes 

down below the configured value.  

Follow these steps to configure the IPv6 multicast forwarding table size:  

Enter system view 

— 

Configure the maximum 
number of entries in the IPv6 
multicast forwarding table 

multicast ipv6 
forwarding-table route-limit 
limit 

Optional 

512 by default. 

Configure the maximum 
number of downstream nodes 
for a single IPv6 multicast 
forwarding entry  

multicast ipv6 
forwarding-table 
downstream-limit limit 

Optional 

128 by default.