114CHAPTER 6: MULTICAST PROTOCOL

multicast routing table, to determine the incoming interface at which the packet arrives. If a source tree is used, the source address is the address of the source host sending the multicast packet. If a shared tree is used, the source address is the address of the root of the shared tree. When a multicast packet arrives at the router, if RPF check succeeds, the packet will be forwarded according to the multicast forwarding entry. Otherwise, the packet will be dropped.

Applying Multicast IP multicast technology effectively solves the problem of packet forwarding from single-point to multi-point. It implements high-efficient data transmission from single-point to multi-point in IP networks and can save a large amount of network bandwidth and reduce network loads. New value-added services that use multicast can be delivered, including direct broadcasting, Web TV, distance learning, distance medicine, net broadcasting station and real-time audio/video conferencing.

Multimedia and streaming media applications

Communications of the training and corporate sites

Data repository and finance (stock) applications

Any “point-to-multi-point” data distribution

With the increase of multimedia services on IP networks, multicast has huge market potential.

Configuring Common A common multicast configuration covers both the multicast group management

Multicastprotocol and the multicast routing protocol. The configuration includes enabling multicast, configuring multicast forwarding boundary, and displaying multicast routing table and multicast forwarding table.

Configuring Common Multicast

Common multicast configuration includes:

Enabling Multicast

Configuring the Multicast Route Limit

Clearing MFC Forwarding Entries or Statistic Information

Clearing Route Entries From the Core Multicast Routing Table

Displaying and Debugging Common Multicast Configuration

Enabling Multicast

Enable multicast first before enabling the multicast routing protocol.

Perform the following configuration in system view.

Table 116 Enabling Multicast

Operation

Command

 

 

Enable multicast

multicast routing-enable

Disable multicast

undo multicast routing-enable

 

 

By default, multicast routing is disabled.

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3Com 10014298 manual Enabling Multicast, By default, multicast routing is disabled, Multicast routing-enable