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Multicast SPT Threshold Tab

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Multicast SPT Threshold Tab

Network > Virtual Router > Multicast > SPT Threshold

The Shortest Path Tree (SPT) threshold defines the point at which the virtual router switches multicast routing for a multicast group or prefix from shared tree distribution (sourced from the rendezvous point) to source tree (also known as shortest path tree or SPT) distribution. Add an SPT threshold for a multicast group or prefix.

SPT Threshold	Description
Multicast Group/Prefix	Specify the multicast address or prefix for which multicast routing switches to SPT distribution when throughput to the group or prefix reaches the threshold setting.
Threshold (kbps)	Select a setting to specify the point at which multicast routing switches to SPT distribution for the corresponding multicast group or prefix: 0 (switch on first data packet)—(default) When a multicast packet for the group or prefix arrives, the virtual router switches to SPT distribution. never (do not switch to spt)—The virtual router continues to forward multicast traffic to this group or prefix down the shared tree. Enter the total number of kilobits from multicast packets that can arrive for the corresponding multicast group or prefix at any interface and over any time period (range is 1 to 4,294,967,295). When throughput reaches this number, the virtual router switches to SPT distribution.

SPT Threshold

Description

Multicast Group/Prefix

Specify the multicast address or prefix for which multicast routing switches to SPT distribution when throughput to the group or prefix reaches the threshold setting.

Threshold (kbps)

Select a setting to specify the point at which multicast routing switches to SPT distribution for the corresponding multicast group or prefix:

0 (switch on first data packet)—(default) When a multicast packet for the group or prefix arrives, the virtual router switches to SPT distribution.
never (do not switch to spt)—The virtual router continues to forward multicast traffic to this group or prefix down the shared tree.
Enter the total number of kilobits from multicast packets that can arrive for the corresponding multicast group or prefix at any interface and over any time period (range is 1 to 4,294,967,295). When throughput reaches this number, the virtual router switches to SPT distribution.

Multicast Interfaces Tab

Multicast Source Specific Address Space Tab