cisco培训05-Catalyst_QoS.pptVIP

Deploying QoS in Catalyst Switches Carl Solder Consulting Engineer – CCIE #2416 Asia Pacific Core Technology Group What makes me qualifiedto talk about QoS? Tighten your Seat Belts… Why QoS?When Do We Not Need QoS? Cisco QoS Toolkit Assigning Priority Assigning Priority Assigning Priority Assigning Priority Priority Assignment – CoS and ToS CoS in 802.1Q (802.1p) CoS in Inter Switch Link (ISL) Type of Service – ToS (Layer 3) IP Precedence Differentiated Services Code Point - DSCP Assigning Trust Trust States Extended Trust Extended Trust Boundary Policing (Rate Limiting) Policing (Rate Limiting interval) Policing (Rate Limiting)An example using the Cat6K Policing (Rate Limiting)An example using the Cat6K Policing – Aggregates and Microflows Dual Leaky BucketPFC2 on Catalyst 6500 Policing vs. Shaping Traffic Shaping Policy Maps and Class Maps Maps Marking Buffering Congestion AvoidanceTail Drop and WRED Scheduling – Strict Priority Scheduling – Weighted Round Robin (WRR) Catalyst 2950 – Enhanced QoS Features Catalyst 2950: Aggregate QoS Model Default QoS State of Catalyst 2950 2950 QoS – Classification using Trust 2950 QoS – Classification using Trust 2950 QoS – Classification via Port 2950 QoS – Classification and ACL’s 2950G ACP Restrictions 2950 QoS - Layer 2 Classification 2950 QoS - Layer 3 and 4 Classification 2950 QoS - Policing 2950 QoS - QoS Marking 2950 QoS - Default CoS-to-DSCP maps 2950 QoS - Queuing and Scheduling Catalyst 3550 Catalyst 3550 Architecture Catalyst 3550: Aggregate QoS Model 3550 – Classification 3550 – Classification (via ACL’s) 3550 - Policing 3550 – Marking (Policing) 3550 – Marking (Maps) 3550 – Marking (DSCPDSCP Mutation Map) 3550 –Scheduling (Queue Maps) 3550 – Scheduling (Queue Weights) 3550 – Congestion Control (WRED) 3550 – Congestion Control (Strict Priority) Catalyst 4000 Supervisors Catalyst 4000 Supervisor III QoS Catalyst 4000 Sup3Board layout Where is QoS processed? Catalyst 4000 Supervisor III QoS Default QoS State o