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Overview
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Additionally, in this section we did take into account the port egress rate shaper or SAP aggregate
shaper. These shapers limit the available bandwidth to a port or a SAP. This does not change the
scheduling mechanism but provides additional controls to the user to limit the amount of
bandwidth a SAP can get or a port can transmit.
On 7210 SAS-K, schedulers are available at:
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Select the next highest priority queues (priority of 2), SAP #2 -> Queue#2 and schedule it
until CIR is met.
No more queues left to be serviced in the CIR loop; All queues CIR is met.
NOTE: SAP#1-> Queue#1 and SAP#2->Queue#1 are not serviced in CIR loop as they are
configured with CIR=0; They are serviced only in the PIR loop.
Start PIR loop.
Select the highest priority queues (priority of 4), that is, SAP#1 -> Queue#6, SAP #2 ->
Queue#7. These do not have any PIR configured, therefore the user can skip them;
Select the next highest priority queues (priority of 3), SAP #1-> Queue#5, SAP #1 ->
Queue#2, SAP #2 -> Queue#4 and schedule them until their PIR is met; Each queue is
given a bandwidth in proportion to the configured weight until the PIR is met.
Select the next highest priority queues (priority of 2), SAP #2 -> Queue#2 and schedule it
until PIR is met.
Select the next highest priority queues (priority of 1), SAP#1-> Queue#1 and SAP#2-
>Queue#1 and schedule them until the PIR is met; Each queue is given bandwidth in
proportion to the configured weight until their PIR is met.
Service ingress - This scheduler distributes the available bandwidth among all the SAPs
with service ingress policies.
Service egress - This scheduler distributes the available bandwidth among all the SAPs
configured on a given port with service egress policies.
Network/Access-uplink Port egress - This scheduler distributes the available bandwidth
among up to 8 egress queues configured on the access-uplink port.
Network/Access-uplink Port ingress - This scheduler distributes the available bandwidth
among up to 8 ingress queues configured on the access-uplink port.
7210 SAS D, E, K OS Quality of Service Guide
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