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Configuring General Multicast Forwarding Cache Properties

To configure multicast forwarding cache limits and timeout values, include the forwarding-cache statement:




forwarding-cache { 

threshold suppress value <reuse value>; 

timeout minutes; 
}

You can include this statement at the following hierarchy levels:

[edit routing-options multicast]
[edit logical-systems logical-system-name routing-options multicast]
[edit logical-systems logical-system-name routing-instances routing-instance-name routing-options multicast]
[edit routing-instances routing-instance-name routing-options multicast]

For an overview of logical systems and a detailed example of logical system configuration, see the logical systems chapter of the JUNOS Feature Guide.

By default, there are no limits on the number of multicast forwarding cache entries.

You can specify a value for the threshold to suppress new multicast forwarding cache entries and an optional reuse value for the threshold at which the router begins to create new multicast forwarding cache entries. The range for both is from 1 through 200,000. If configured, the reuse value should be less than the suppression threshold value. The suppression value is mandatory. If you do not specify the optional reuse value, then the number of multicast forwarding cache entries is limited to the suppression value. A new entry is created as soon as the number of multicast forwarding cache entries falls below the suppression value.

You can also specify a timeout value for all multicast forwarding cache entries. The range for the timeout value is 1 through 720 minutes.

For information about supported standards for multicast scoping, see IP Multicast Standards.

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