Configuring An Ipv6 Multicast Forwarding Range; Configuring The Ipv6 Multicast Forwarding Table Size - 3Com MSR 50 Series Configuration Manual

Configuring an IPv6
Multicast Forwarding
Range
n
Configuring the IPv6
Multicast Forwarding
Table Size
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.
Presently, you can define an IPv6 multicast forwarding range by:
specifying boundary interfaces, which form a closed IPv6 multicast forwarding
■
area, or
setting the minimum hop limit value required for an IPv6 multicast packet to be
■
forwarded.
You can configure the forwarding boundary for a specific IPv6 multicast group 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. 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.
You can configure the minimum hop limit required for an IPv6 multicast packet to
be forwarded on all interfaces that support IPv6 multicast forwarding. Before
being forwarded from an interface, every IPv6 multicast packet (including every
IPv6 multicast packet sent from the local device) is subject to a hop limit check:
If the hop limit value of the packet (already decremented by 1 on this router) is
■
greater than the minimum hop limit value configured on the interface, the
packet will be forwarded.
If the hop limit value of the packet is less than the minimum hop limit value
■
configured on the interface, the packet will be discarded.
Follow these steps to configure an IPv6 multicast forwarding range:
To do...
Enter system view
Enter interface view
Configure an IPv6 multicast
forwarding boundary
Configure the minimum hop
limit value required for an IPv6
multicast packet to be
forwarded
The support for the multicast ipv6 minimum-hoplimit command varies with
devices.
Too many IPv6 multicast routing entries can exhaust the router's memory and thus
result in lower router performance. Therefore, the number of IPv6 multicast
routing entries should be limited. You can set a limit on the number of entries in
the IPv6 multicast routing table based on the actual networking situation and the
performance requirements. In any case, the number of route entries must not
Configuring IPv6 Multicast Routing and Forwarding
Use the command...
system-view
interface interface-type
interface-number
multicast ipv6 boundary
ipv6-group-address
prefix-length
multicast ipv6
minimum-hoplimit
hoplimit-value
1213
Remarks
-
-
Required
No forwarding boundary by
default
Required
1 by default