Huawei Quidway S9300 Configuration Manual - Multicast page 241

Quidway S9300 Terabit Routing Switch
Configuration Guide - Multicast
Static multicast routes are used to change the RPF routes or to connect RPF routes instead of
forwarding data.
Static multicast routes are effective only on the S9300s configured with static multicast routes,
and cannot be advertised or imported to other switches.
Multicast Routing Policy
If multiple unicast routes with the same cost exist when an S9300 selects the upstream interface,
you can set the mode of selecting an RPF route.
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Controllable Range of Multicast Forwarding
On a network, the multicast information for each multicast group is transmitted in a certain range.
You can set the multicast forwarding range on the S9300. That is, configure the multicast
forwarding boundary on interfaces to form a closed multicast forwarding area.
Controllable Multicast Forwarding Table
When planning a specific network according to multicast services, the Internet Service Provider
(ISP) can configure the multicast forwarding table according to the following policies:
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Multicast Route Test
When a fault occurs on a multicast network, you can run the ping multicast and mtrace
commands to test the connectivity of the network.
The ping multicast command is used to check whether a multicast group is reachable to
implement the following functions:
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Issue 01 (2009-07-28)
By default, the S9300 selects routes according to the sequence of entries.
According to the longest match, the S9300 selects the route with the longest destination
address matching the address of the source of the packet.
The S9300 performs load balancing among routes.Load balancing of multicast traffic is
based on the multicast source, multicast group, or multicast source + multicast group can
optimize network traffic distribution when multiple multicast data flows exist.
Limiting the number of entries in the multicast forwarding table
An S9300 creates and maintains a forwarding entry for each received multicast packet.
Excessive multicast forwarding entries, however, may use up the memory of the S9300.
You can define the maximum number of entries in the multicast forwarding table on the
S9300. Limiting the number of entries according to the actual networking and service
performance can prevent switch faults caused by excessive entries.
Limiting the number of downstream nodes of a single forwarding entry
An S9300 replicates a multicast packet for each downstream node and sends it out. Each
downstream node is a branch of a multicast distribution tree (MDT). The number of
downstream nodes determines the maximum scale of an MDT and the service range. You
can define the number of downstream nodes of a single forwarding entry on an S9300.
Limiting the number of downstream nodes according to the actual networking and service
performance can ease the processing pressure of a switch and control the service range.
Pinging a reserved group address
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6 Multicast Route Management
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