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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
are not immediately deleted. Instead, the IPv6 multicast routing protocol that runs on the switch deletes
them. The switch no longer adds new IPv6 multicast forwarding entries until the number of existing IPv6
multicast forwarding entries comes down below the configured value.
When the switch forwards IPv6 multicast traffic, it replicates a copy of the IPv6 multicast traffic for each
downstream node and forwards the traffic. Each of these downstream nodes forms a branch of the IPv6
multicast distribution tree. You can configure the maximum number of downstream nodes (the maximum
number of outgoing interfaces) for a single entry in the IPv6 multicast forwarding table to lessen the
burden on the switch 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 are not deleted immediately. Instead, the IPv6 multicast routing protocol
deletes them. The switch no longer adds new IPv6 multicast forwarding entries for newly added
downstream nodes until the number of existing downstream nodes comes down below the configured
value.
To configure the IPv6 multicast forwarding table size:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Configure the maximum
number of entries in the IPv6
multicast forwarding table.
multicast ipv6 forwarding-table
route-limit limit
Optional.
1000 by default.
3. 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.
Displaying and maintaining IPv6 multicast routing
and forwarding
CAUTION:
The reset commands might cause IPv6 multicast data transmission failures.
To display and maintain IPv6 multicast routing and forwarding:
Task Command Remarks
Display the IPv6 multicast boundary
information.
display multicast ipv6 boundary
{ group [ ipv6-group-address
[ prefix-length ] ] | scope [ scope-id ] }
[ interface interface-type
interface-number ] [ | { begin | exclude
| include } regular-expression ]
Available in any view.
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