Configuring Control Parameters Of The Multicast Forwarding Table; Establishing The Configuration Task - Huawei Quidway S7700 Configuration Manual - Multicast

Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast
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9.6 Configuring Control Parameters of the Multicast
Forwarding Table
During network planning, you can restrict the capacity of the forwarding table on a multicast
device, such as the maximum number of entries in the multicast forwarding table and the
maximum number of downstream interfaces of multicast forwarding entries. In this manner,
traffic load on the multicast device is released and the fault risk resulted from excessive entries
can be avoided.

9.6.1 Establishing the Configuration Task

Before configuring control parameters for the multicast forwarding table, familiarize yourself
with the applicable environment, pre-configuration tasks, and required data. This can help you
complete the configuration task quickly and accurately.
Applicable Environment
To plan a network according to the services, the ISP needs to perform the following configuration
policies:
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Pre-configuration Tasks
Before configuring control parameters of the multicast forwarding table, complete the following
tasks:
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Issue 01 (2011-07-15)
interface { interface-type interface-number | register } | outgoing-interface
{ include | exclude | match } { interface-type interface-number | vpn-instance vpn-
instance-name | register | none } ]
Run the display multicast [ vpn-instance vpn-instance-name | all-instance ] boundary
[ group-address [ mask | mask-length ] ] [ interface interface-type interface-number ]
command to check information about the multicast boundary of an interface.
Limiting the number of entries in the multicast forwarding table
Each switch maintains a routing entry for each received multicast packet. Too many entries,
however, may exhaust the memory of the switch. In this case, you can define the maximum
number of multicast routing entries. Limiting the number of the entries can avoid faults in
the switch.
Limiting the number of downstream nodes of a single entry
Switchs copy a multicast packet for each downstream node, and the downstream node sends
the copy out. Each downstream node forms a branch of the multicast distribution tree. The
number of the downstream nodes determines the maximum scale of the multicast
distribution tree and the multicast service scope. Users can define the number of the
downstream nodes of a single forwarding entry. Limiting the number of downstream nodes
according to the actual networking and the services can reduce the pressure of switchs and
control the multicast service scope.
Configuring a unicast routing protocol
Configuring basic multicast functions
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9 IPv4 Multicast Routing Management
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[ outgoing-interface-number [ number ] ]
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