Subscriber Destination String Queue Group Identification - Alcatel-Lucent 7450 Quality Of Service Manual

Post-CFHP Queuing and Scheduling

Subscriber Destination String Queue Group Identification

When a subscriber is identified, a special destination string may optionally exist for the
subscriber that is typically used to identify the subscriber's destination aggregation node.
This feature applies only to the 7450 ESS and 7950 SR.
On the subscriber's egress Ethernet port, the default policer-output-queues and other
explicitly created queue groups may be configured to represent a destination node by defining
the same destination string on the queue group. When the subscriber's destination string is
defined, the system will search the subscriber's egress port for an egress queue group with
the same string defined. If found, it will use that matched queue group instead of the default
queue group. If a queue-group matching the string is not found, the subscriber identification
event will not fail and the subscriber host will be mapped to default policer-output-queues.
The destination node-based queuing model is designed to provide the ability to shape the
aggregate subscriber output to a destination aggregation node based on a queue group created
for the specific purpose. On the queue group, a scheduling-policy is applied which defines
the desired virtual scheduling behavior of the queues and aggregate maximum rate of the
queue group. The destination string matching function could be used to represent any
arbitrary downstream bandwidth limit, not just an aggregation node. If the destination string
is not present (null value), the default policer egress queue group ('policer-output-queues') on
the subscriber's port will be used.
SAP Default Destination String
In order to simplify subscriber destination string provisioning, you can use a def-inter-dest-
id command under the sub-sla-mgmt node within a SAP which allows the definition of a
default destination string for all subscribers associated with the SAP. The command also
accepts the use-top-q flag that automatically derives the string based on the top most
delineating Dot1Q tag from the SAP's encapsulation. This feature applies only to the
7450 ESS and 7750 SR.
The command is also supported within the msap-policy allowing similar provisioning
behavior for automatically created managed SAPs.
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