Configuring Forwarding Cache Snooping Options

You can configure threshold values on the forwarding cache to suppress (suspend) snooping when the cache entries reach a certain maximum and reuse the cache when the number falls to another threshold value. By default, no threshold values are enabled on the router.

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 must 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.

To configure threshold values for a forwarding cache, assign values to either the suppress or reuse threshold and include the forwarding-cache statement:

You can include these statements at the following hierarchy levels:

• [edit bridge-domains bridge-domain-name multicast-snooping-options]
• [edit routing-instances routing-instance-name multicast-snooping-options]
• [edit routing-instances routing-instance-name bridge-domains bridge-domain-name multicast-snooping-options]
• [edit logical-systems logical-system-name routing-instances routing-instance-name multicast-snooping-options]
• [edit logical-systems logical-system-name routing-instances routing-instance-name bridge-domains bridge-domain-name multicast-snooping-options]