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To do...
Configure multicast load splitting
Configuring a multicast forwarding range
Multicast packets do not travel without a boundary in a network. The multicast data corresponding to
each multicast group must be transmitted within a definite scope. You can define a multicast forwarding
range by one of the following methods:
Specifying boundary interfaces, which form a closed multicast forwarding area, or
•
Setting the minimum time to live (TTL) value required for a multicast packet to be forwarded.
•
NOTE:
Setting the minimum TTL is not supported on HP A5500 EI Switch Series.
You can configure a forwarding boundary specific to a particular multicast group on all interfaces that
support multicast forwarding. A multicast forwarding boundary sets the boundary condition for the
multicast groups in the specified range. If the destination address of a multicast packet matches the set
boundary condition, the packet will not be forwarded. After you configure a multicast boundary on an
interface, the interface can no longer forward multicast packets—including packets sent from the local
device—or receive multicast packets.
Follow these steps to configure a multicast forwarding range:
To do...
Enter system view
Enter interface view
Configure a multicast forwarding
boundary
Configuring the multicast forwarding table size
The switch maintains the corresponding forwarding entry for each multicast packet that it receives.
Excessive multicast routing entries, however, can exhaust the switch's memory and cause lower
performance. You can set a limit on the number of entries in the multicast forwarding table based on the
networking situation and the performance requirements. If the configured maximum number of multicast
forwarding table entries is smaller than the current value, the forwarding entries in excess are not
deleted immediately. Instead, the multicast routing protocol that runs on the switch deletes them. The
switch no longer adds new multicast forwarding entries until the number of existing multicast forwarding
entries comes down below the configured value.
When forwarding multicast traffic, the switch replicates a copy of the multicast traffic for each
downstream node and forwards the traffic. Therefore, each of these downstream nodes forms a branch
of the 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 multicast forwarding table
to lessen the burden on the switch for replicating multicast traffic. If the configured maximum number of
Use the command...
multicast load-splitting { source |
source-group }
Use the command...
system-view
interface interface-type interface-
number
multicast boundary group-address {
mask | mask-length }
75
Remarks
Optional
Disabled by default
Remarks
—
—
Required
No forwarding boundary by
default
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