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172 CHAPTER 6: MULTICAST PROTOCOL
table independently provided for multicast (such as the MBGP multicast routing
table). This check mechanism is the basis for most multicast routing protocols ,
which is known as a RPF (Reverse Path Forwarding) check. A multicast router
uses the source address from the multicast packet to query the unicast routing
table, or the independent 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
Multicast
A common multicast configuration covers both the multicast group management
protocol 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 3 Enabling Multicast
Operation Command
Enable multicast multicast routing-enable