Alcatel-Lucent 7750 SR OS Service Manual page 1062

VPRN Service Configuration Commands
spt-threshold — Specifies the configured threshold in kilo-bits per second(kbps) for the group to
ssm-groups
Syntax [no] ssm-groups
Context config>service>vprn
Description
This command enables access to the context to enable a source-specific multicast (SSM)
configuration instance.
Default
none
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which this (S,G) belongs. For a group G configured with a threshold, switchover to SPT for an
(S,G) is attempted only if the (S,G)'s rate exceeds this configured threshold.
7750 SR OS Services Guide