Overview
Page 394 7210 SAS D, E, K OS Quality of Service Guide
• 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.
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:
• 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.
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