Chapter 12: Multicast Network Design; General Multicast Considerations; Multicast Scalability Design Rules - Avaya 8800 Planning And Engineering, Network Design

Chapter 12: Multicast network design

Use multicast routing protocols to efficiently distribute a single data source among multiple users in
the network. This section provides information about designing networks that support IP multicast
routing.
For more information about multicast routing, see Avaya Ethernet Routing Switch 8800/8600
Configuration — IP Multicast Routing Protocols (NN46205-501).
Note:
For information on IP multicast over SPBM, see Avaya Ethernet Routing Switch 8800/8600
Configuration — Shortest Path Bridging (NN46205–525).

General multicast considerations

Use the following general rules and considerations when planning and configuring IP multicast.

Multicast scalability design rules

To increase multicast route scaling, follow these eight design rules:
1. Whenever possible, use simple network designs that do not use VLANs that span several
switches. Instead, use routed links to connect switches.
2. Whenever possible, group sources should send to the same group in the same subnet. The
Avaya Ethernet Routing Switch 8800/8600 uses a single egress forwarding pointer for all
sources in the same subnet sending to the same group. Be aware that these streams have
separate hardware forwarding records on the ingress side.
To obtain information about the ingress and egress port information for IP multicast streams
flowing through your switch, use the CLI command show ip mroute-hw group trace.
In the ACLI, the command is show ip mroute hw-group-trace.
Note:
This command works only when PIM is enabled. It is not supported with Multicast over
SPBM.
June 2016 Planning and Engineering — Network Design
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