Applying a scheduler policy to a Vport

The user can apply a scheduler policy to the Vport. This allows scheduling control of subscriber tier 1 schedulers in a scheduler policy applied to the egress of a subscriber or SLA profile, or to a PW SAP in an IES or VPRN service.

The advantage of using a scheduler policy under a Vport, compared to the use of a port scheduler (with or without an agg-rate), is that it allows a port parent to be configured at the Vport level.

Bandwidth distribution from an egress port scheduler to a Vport configured with a scheduler policy can be performed based on the level/cir-level and weight/cir-weight configured under the scheduler’s port parent. The result is in allowing multiple Vports, for example representing different DSLAMs, to share the port bandwidth capacity in a flexible way that is under the control of the user.

The configuration of a scheduler policy under a Vport is mutually exclusive to the configuration of a port scheduler policy or an aggregate rate limit.

A scheduler policy is configured under a Vport as follows:

CLI syntax:

config>port>ethernet>access>egress>vport# scheduler-policy scheduler-policy-name

When using this model, a tier 1 scheduler in a scheduling policy applied to a subscriber profile or SLA profiles must be configured as follows:

CLI syntax:

config>qos>scheduler-policy>tier# parent-location vport

If the Vport exists, but port does not have a scheduler policy applied, then its schedulers are orphaned and no port level QOS control can be enforced.

The following show/monitor/clear commands are available related to the Vport scheduler:

show qos scheduler-hierarchy port port-id vport name [scheduler scheduler-name] 
[detail]

show qos scheduler-stats port port-id vport name [scheduler scheduler-name] [detail]

monitor qos scheduler-stats port port-id vport name [interval seconds ] [repeat 
repeat] [absolute | rate]

clear qos scheduler-stats port port-id vport name [scheduler scheduler-name] [detail]

HQoS adjustment and host tracking are not supported on schedulers that are configured in a scheduler policy on a Vport, so the configuration of a scheduler policy under a Vport is mutually exclusive to the configuration of the egress-rate-modify parameter.

ESM over MPLS pseudowires are not supported when a scheduler policy is configured on a Vport.