Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 109
The adapter cards provide sets of eight queues for incoming traffic: 7 sets of queues
for the 7705 SAR-8 and 17 sets of queues for the 7705 SAR-18. Each set of queues
is specific to a destination adapter card. For the 7705 SAR-8 and 7705 SAR-18
(respectively), 6 and 16 sets of queues are automatically created for each access
egress adapter card, plus 1 set of queues for multicast traffic.
There is one additional set of queues for slow-path (control) traffic destined for the
CSMs.
The individual queues within each set of queues provide buffer space for traffic
isolation based on the CoS values being applied (from the received EXP bits).
All of the network ingress ports of the adapter card share the same sets of queues,
which are created automatically.
Once the packets received from the network are mapped to queues, four access
ingress-like queue-type and profile (rate-based) schedulers per destination card
service the queues in strict priority. The following queue-type and profiled schedulers
service the queues in the order listed.
1. Expedited in-profile scheduler
2. Best Effort in-profile scheduler
3. Expedited out-of-profile scheduler
4. Best Effort out-of-profile scheduler
To complete the operation, user-configurable shapers send the traffic into the fabric.
See Configurable Ingress Shaping to Fabric (Access and Network) for details.
Throughout this operation, each packet retains its individual CoS value.
Note: The encapsulation type must be ppp-auto for PPP/MLPPP bundles on the following:
• T1/E1 ports on the 7705 SAR-A (variants with T1/E1 ports)
• T1/E1 ports on the 7705 SAR-M (variants with T1/E1 ports)
• T1/E1 ports on the 7705 SAR-X
• 16-port T1/E1 ASAP Adapter card
• 32-port T1/E1 ASAP Adapter card
• 2-port OC3/STM1 Channelized Adapter card
• 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card
• T1/E1 ports on the 4-port T1/E1 and RS-232 Combination module (on 7705 SAR-H)
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