Users Guide

Layer 3 Routing Commands 1646
mandatory. Discovering the local domain-name server is the intended use
of multicast messages on remote networks when there is less than one
server per network.
• Applications used for datacasting: Since multimedia transmission has
become increasingly popular, multicast transmission use has increased.
Multicast transmission may be used to efficiently accommodate this type
of communication. For instance, the audio and video signals are captured,
compressed and transmitted to a group of receiving stations. Instead of
using a set of point-to-point connections between the participating nodes,
multicasting can be used for distribution of the multimedia data to the
receivers. The participating stations are free to join or leave an audio-cast
or a video-cast as needed. The variable membership maintenance is
managed efficiently through multicasting.
clear ip mroute
Use this command to selectively clear IPv4 multicast entries from the cache.
Syntax
clear ip mroute { * | group-address [ source-address ] }
•
* —Deletes all IPv4 entries from the IP multicast routing table.
•
group-address — IP address of the multicast group.
•
source-address —IP address of a multicast source that is sending multicast
traffic to the group.
Default configuration
There is no default configuration for this command.
Command Mode
User Exec, Privileged Exec modes, Global Configuration mode and all
Configuration submodes
User Guidelines
When a * entry is deleted through this command, it cannot be formed again
until it is expired in IGMP and started again via the host. The default mcache
time-out is 210 seconds.