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Configuring an IPv6 multicast forwarding range
IPv6 multicast packets do not travel infinitely in a network. The IPv6 multicast data of each IPv6
multicast group must be transmitted within a definite scope. You can configure the forwarding
boundary for a specific IPv6 multicast group or an IPv6 multicast group with the scope field in its
group address being specified on all interfaces that support IPv6 multicast forwarding. A multicast
forwarding boundary sets the boundary condition for the IPv6 multicast groups in the specified range
or scope. If the destination address of an IPv6 multicast packet matches the set boundary condition,
the packet will not be forwarded. Once an IPv6 multicast boundary is configured on an interface, this
interface can no longer forward IPv6 multicast packets (including those sent from the local device) or
receive IPv6 multicast packets.
To configure an IPv6 multicast forwarding range:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type
interface-number
N/A
3.
Configure an IPv6 multicast
forwarding boundary.
multicast ipv6 boundary
{
ipv6-group-address prefix-length
|
scope
{
scope-id
|
admin-local
|
global
|
organization-local
|
site-local
} }
No forwarding boundary by
default.
Configuring the IPv6 multicast forwarding table size
The router maintains the corresponding forwarding entry for each IPv6 multicast packet that it
receives. Excessive IPv6 multicast routing entries, however, can exhaust the router's memory and
cause lower performance. You can set an upper 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 upper limit is smaller than the number of existing entries in the IPv6 multicast forwarding
table, the entries in excess are not deleted immediately. The IPv6 multicast routing protocol that runs
on the router will delete them. The router will no longer install new IPv6 multicast forwarding entries
until the number of existing IPv6 multicast forwarding entries decreases below the upper limit.
When the router forwards IPv6 multicast data, it replicates a copy of the IPv6 multicast data for each
downstream node and forwards the data. Each of these downstream nodes is 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 router for replicating IPv6 multicast traffic. If the configured upper limit is
smaller than the number of existing downstream nodes for a forwarding entry, the downstream
nodes in excess are not deleted immediately. The IPv6 multicast routing protocol will delete them.
The router will no longer update the newly added downstream nodes for the forwarding entry until the
number of existing downstream nodes for the entry decreases below the upper limit.
Configuring the IPv6 multicast forwarding table size for the public network
Step 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.
By default, the upper limit is 4000
for the HPE 5800 switches, and
1000 for the HPE 5820X switches.
3.
Configure the maximum
multicast ipv6 forwarding-table
Optional.
