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.
