HSMDA Features
790 Quality of Service Guide
Scheduler Maximum Rate
A maximum scheduling rate may be defined for the scheduler. The rate is specified in
megabits per second and the default rate is max which allows the scheduler to operate without
a set limit. When the HSMDA scheduling policy is applied to an egress port, the maximum
scheduling rate may be used to define a rate less then the available line rate of the port. When
the HSMDA scheduler policy is applied to the ingress path of an HSMDA, it sets the
maximum ingress bandwidth for the XMA or MDA (not usually a desirable action). The
scheduler includes the full Ethernet frame encapsulation overhead when updating the
scheduler level PIR, including the 12 byte inter-frame gap and the 8 byte preamble.
HSMDA Scheduler Policy Overrides
Once an HSMDA scheduler is applied to an Egress port or to an ingress HSMDA, the various
parameters may be overridden. This allows an HSMDA scheduler policy to be adapted to
changing needs on a port or HSMDA basis without requiring a new policy to be created.
Orphan Queues
Unlike port or service based virtual scheduling behavior, the HSMDA schedulers do not need
to deal with orphaned queues (queues without an explicit scheduler parent defined). Every
queue on an HSMDA is implicitly mapped to the scheduler based on the queues identifier.
Default HSMDA Scheduling Policy
An HSMDA scheduling policy with the name default always exists on the system and does
not need to be created. The default policy cannot be modified or deleted. Attempting to delete
the default policy using the no hsmda-scheduler-policy default command will return an error
without changing the default policy.
The default policy contains the parameters listed in Table 62.
Table 62: HSMDA Scheduling Policy Default Values
Command Default
description no description
max-rate no max-rate
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