Cisco WS-X6748-GE-TX - Switch - 48 Ports White Paper - Page 12
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Figure 13. SRR Compared to WRR
Scheduling: Strict Priority Queuing
Select line cards support a strict priority queue on a per-port basis. The purpose of a strict priority queue is to facilitate support for latency-sensitive
traffic that gets queued on the line card. When a packet is placed into a strict priority queue, scheduling of packets from WRR queues will cease, and
the packet(s) in the strict priority queue will be transmitted. Only when the strict priority queue is empty will the scheduling process recommence
sending packets from WRR queues. (See Figure 14.)
Figure 14. Strict Priority Queuing Process
AUTO-QoS
The concept of auto-QoS was designed to simplify the configuration and implementation of specific QoS features on the Cisco Catalyst 6500. Auto-
QoS puts in place a set of macros that can be implemented from the Cisco Catalyst 6500 command line. In its initial implementation, the application
of auto-QoS is focused on setting the QoS configuration for a given port to support an attached Cisco IP Phone. The QoS settings applied conform
to the IETF settings for attached telephony devices.
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