Users can enable the per-ISID shaping on the egress context of a B-VPLS SAP by configuring an encapsulation group, referred to as encap-group in CLI, under the QoS sub-context, referred to as encap-defined-qos.
config>service>vpls>sap>egress>encap-defined-qos>encap-group group-name [type group-type] [qos-per-member] [create]
The group name is unique across all member types. The isid type is currently the only option.
The user adds or removes members to the encap-group, one at a time or as a range of contiguous values. However, when the qos-per-member option is enabled, members must be added or removed one at a time. These members are also referred to as ISID contexts.
config>service>vpls>sap>egress>encap-defined-qos>encap-group
[no] member encap-id [to encap-id]
The user can configure one or more encap-groups in the egress context of the same B-SAP, defining different ISID values and applying each a different SAP egress QoS policy, and optionally a different scheduler policy/agg-rate-limit. ISID values are unique within the context of a B-SAP. The same ISID value cannot be re-used in another encap-group under the same B-SAP but can be re-used in an encap-group under a different B-SAP. Finally, if the user adds to an encap-group an ISID value which is already a member of this encap-group, the command causes no effect. The same if the user attempts to remove an ISID value which is not a member of this encap-group.
When a group is created, the user assigns a SAP egress QoS policy, and optionally a scheduler policy or aggregate rate limit, using the following commands:
configure service vpls sap egress encap-defined-qos encap-group qos sap-egress-policy-id
configure service vpls sap egress encap-defined-qos encap-group scheduler-policy scheduler-policy-name
configure service vpls sap egress encap-defined-qos encap-group agg-rate-limit kilobits-per-second
A SAP egress QoS policy must first be assigned to the created encap-group before the user can add members to this group. Conversely, the user cannot perform the no qos command until all members are deleted from the encap-group.
An explicit or the default SAP egress QoS policy continues to be applied to the entire B-SAP but this serves to create the set of egress queues which is used to store and forward a packet which does not match any of the defined ISID values in any of the encap-groups for this SAP.
Only the queue definition and fc-to-queue mapping from the encap-group SAP egress QoS policy is applied to the ISID members. All other parameters configurable in a SAP egress QoS policy must be inherited from egress QoS policy applied to the B-SAP.
Furthermore, any other CLI option configured in the egress context of the B-SAP continues to apply to packets matching a member of any encap-group defined in this B-SAP.
Note also that the SAP egress QoS policy must not contain an active policer or an active queue-group queue or the application of the policy to the encap-group fails. A policer or a queue-group queue is referred to as active if one or more FC map to it in the QoS policy or the policer is referenced within the action statement of an IP or IPv6 criteria statement. Conversely, the user is not allowed to assign a FC to a policer or a queue-group queue, or reference a policer within the action statement of an IP or IPv6 criteria statement, after the QoS policy is applied to an encap-group.
The qos-per-member keyword allows the user to specify that a separate queue set instance and scheduler/agg-rate-limit instance are created for each ISID value in the encap-group. By default, shared instances are created for the entire encap-group.
When the B-SAP is configured on a LAG port, the ISID queue instances defined by all the encap-groups applied to the egress context of the SAP are replicated on each member link of the LAG. The set of scheduler/agg-rate-limit instances are replicated per link or per IOM or XMA depending if the adapt-qos option is set to link/port-fair mode or distribute mode. This is the same behavior as that applied to the entire B-SAP in the current implementation.