QoS and QoS Policies
120
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
Figure 22 illustrates the traffic treatment for a single Ethernet port. It also illustrates
that the shaped SAP aggregate CIR rate competes with the unshaped 4-priority
aggregate CIR rate for port bandwidth. Once the aggregate CIR rates are satisfied,
the shaped SAP aggregate PIR rate competes with the 4-priority PIR rate (always
maximum) for port bandwidth.
The egress aggregate CIR rate limit for all the unshaped 4-priority SAPs is
configured using the config>port>ethernet>access>egress>unshaped-sap-cir
command.
Figure 22 Access Egress 16-Priority and 4-Priority per-SAP Arbitration for a Single Port
CoS-8
CoS-1
CoS-7
CoS-8
CoS-1
CoS-7
4-priority Scheduled
Unshaped SAPs
16-priority Scheduled
Shaped or
Unshaped SAPs
Buffer Mgmt
via WRED
or Tail Drop
4-priority
Scheduling
16-priority
Scheduling
Per SAP,
Per FC
Queuing
Per SAP,
2nd Tier
Aggregate
Shapers
Priority
Schedulers
Classification
nc
h1
be
nc
h1
be
23379
Exp
In-Prof
BE
In-Prof
CoS-8
In-Prof
CoS-1
In-Prof
CoS-8
Out-Prof
CoS-1
Out-Prof
Exp
Out-Prof
BE
Out-Prof
Strict
Priority
Strict
Priority
RR
Rate
Ethernet port
Access Egress
Per Port Shapers
(where applicable)
per
SAP
Fabric
per
SAP
CIR
CIR, PIR
CIR, PIR
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