QoS Policies
Page 56
7950 XRS Quality of Service Guide
Virtual Hierarchical Scheduling
Virtual hierarchical scheduling is a method that defines a bounded operation for a group of queues.
One or more queues are mapped to a given scheduler with strict and weighted metrics controlling
access to the scheduler. The scheduler has an optional prescribed maximum operating rate that
limits the aggregate rate of the child queues. This scheduler may then feed into another virtual
scheduler in a higher tier. The creation of a hierarchy of schedulers and the association of queues
to the hierarchy allows for a hierarchical Service Level Agreement (SLA) to be enforced.
Scheduler policies in the routers determine the order queues are serviced. All ingress and egress
queues operate within the context of a scheduler. Multiple queues share the same scheduler.
Schedulers control the data transfer between the following queues and destinations:
•
Service ingress queues to switch fabric destinations.
•
Service egress queues to access egress ports.
•
Network ingress queues to switch fabric destinations.
•
Network egress queues to network egress interfaces.
There are two types of scheduler policies:
•
Single Tier Scheduling on page 57
•
Hierarchical Scheduler Policies on page 59
Schedulers and scheduler policies control the data transfer between queues, switch fabric
destinations and egress ports/interfaces. The type of scheduling available for the various
scheduling points within the system are summarized in
.
Table 15: Supported Scheduler Policies
Scheduling From
To
Single-Tier
Hierarchical
Service Egress Queues
Access Egress Ports
Yes
Yes
Network Egress Queues
Network Egress Interfaces
Yes
No
Summary of Contents for 7950
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Page 98: ...Command Hierarchies Page 98 7950 XRS Quality of Service Guide ...
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Page 164: ...Queue Depth Monitoring Page 164 7950 XRS Quality of Service Guide ...
Page 304: ...Service Queue QoS Policy Commands Page 304 7950 XRS Quality of Service Guide ...
Page 368: ...Command Hierarchies Page 368 7950 XRS Quality of Service Guide ...
Page 430: ...Configuration Commands Page 430 7950 XRS Quality of Service Guide ...
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Page 552: ...Editing Advanced Policies Page 552 7950 XRS Quality of Service Guide ...
Page 600: ...Command Hierarchies Page 600 7950 XRS Quality of Service Guide ...
Page 602: ...QoS Commands Page 602 7950 XRS Quality of Service Guide ...
Page 610: ...Standards and Protocols Page 610 7950 XRS Quality of Service Guide ...
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