3com MSR 20-20 참조 매뉴얼

Use the undo multicast ipv6 boundary command to delete a specified IPv6 
multicast forwarding boundary or all IPv6 multicast forwarding boundaries.

By default, no multicast forwarding boundary is configured.

Note that:

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A multicast forwarding boundary sets the boundary condition for the IPv6 
multicast groups in the specified range. If the destination address of an IPv6 
multicast packet matches the set boundary condition, the packet will not be 
forwarded.

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If an interface needs to act as a forwarding boundary for multiple IPv6 
multicast groups, just carry out this command on the interface once for each 
group.

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Assume that Set A and Set B are both multicast forwarding boundary sets to be 
configured, and that B is a subset of A. If A has been configured on an 
interface, it is not allowed to configure B on the interface; if B has been 
configured on the interface before A is configured, the previously configured B 
will be removed.

display multicast ipv6 boundary.

# Configure Ethernet 1/0 to be the forwarding boundary of the IPv6 multicast 
group FF03::101/16.

<Sysname> system-view

[Sysname] interface ethernet 1/0

[Sysname-Ethernet1/0] multicast ipv6 boundary FF03::101 16 

multicast ipv6 forwarding-table downstream-limit limit

System view

limit: Maximum number of downstream nodes (namely the maximum number of 
outgoing interfaces) for a single route in the IPv6 multicast forwarding table. The 
value ranges from 0 to 128.

Use the multicast ipv6 forwarding-table downstream-limit command to 
configure the maximum number of downstream nodes for a single route in the 
IPv6 multicast forwarding table.

Use the undo multicast ipv6 forwarding-table downstream-limit 
command to restore the system default.

By default, the maximum number of downstream nodes for a single route in the 
IPv6 multicast forwarding table is 128.