Enterprise QoS Solution Reference Network Design Guide

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Catalyst 6500 PFC2/PFC3—QoS Considerations and Design 2-120 ! Enables WRED on Q6 CAT6500-PFC3(config-if-range)# wrr-queue random-detect 7 ! Enables WRED on Q7 CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 1 80 100 100 100 100 100 100 100 ! Sets Min WRED Threshold for Q1T1 to 80% and all others to 100% CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 1 100 100 100 100 100 100 100 100 ! Sets Max WRED Threshold for Q1T1 to 100% and all others to 100% CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 2 80 100 100 100 100 100 100 100 ! Sets Min WRED Threshold for Q2T1 to 80% and all others to 100% CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 2 100 100 100 100 100 100 100 100 ! Sets Max WRED Threshold for Q2T1 to 100% and all others to 100% CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 3 80 100 100 100 100 100 100 100 ! Sets Min WRED Threshold for Q3T1 to 80% and all others to 100% CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 3 100 100 100 100 100 100 100 100 ! Sets Max WRED Threshold for Q3T1 to 100% and all others to 100% CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 4 80 100 100 100 100 100 100 100 ! Sets Min WRED Threshold for Q4T1 to 80% and all others to 100% CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 4 100 100 100 100 100 100 100 100 ! Sets Max WRED Threshold for Q4T1 to 100% and all others to 100% CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 5 80 100 100 100 100 100 100 100 ! Sets Min WRED Threshold for Q5T1 to 80% and all others to 100% CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 5 100 100 100 100 100 100 100 100 ! Sets Max WRED Threshold for Q5T1 to 100% and all others to 100% CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 6 80 100 100 100 100 100 100 100 ! Sets Min WRED Threshold for Q6T1 to 80% and all others to 100% CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 6 100 100 100 100 100 100 100 100 ! Sets Max WRED Threshold for Q6T1 to 100% and all others to 100% CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue random-detect min-threshold 7 80 100 100 100 100 100 100 100 ! Sets Min WRED Threshold for Q7T1 to 80% and all others to 100% CAT6500-PFC3(config-if-range)# wrr-queue random-detect max-threshold 7 100 100 100 100 100 100 100 100 ! Sets Max WRED Threshold for Q7T1 to 100% and all others to 100% CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# CAT6500-PFC3(config-if-range)# wrr-queue cos-map 1 1 1 ! Assigns Scavenger/Bulk to Q1 WRED Threshold 1 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 2 1 0 ! Assigns Best Effort to Q2 WRED Threshold 1 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 3 1 4 ! Assigns Video to Q3 WRED Threshold 1 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 4 1 2 ! Assigns Net-Mgmt and Transactional Data to Q4 WRED T1 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 5 1 3 Enterprise QoS Solution Reference Network Design Guide Chapter 2 Campus QoS Design Version 3.3
Chapter 2 Campus QoS Design Version 3.3 ! Assigns call signaling and Mission-Critical Data to Q5 WRED T1 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 6 1 6 ! Assigns Internetwork-Control (IP Routing) to Q6 WRED T1 CAT6500-PFC3(config-if-range)# wrr-queue cos-map 7 1 7 ! Assigns Network-Control (Spanning Tree) to Q7 WRED T1 CAT6500-PFC3(config-if-range)# priority-queue cos-map 1 5 ! Assigns VoIP to the PQ (Q4) CAT6500-PFC3(config-if-range)#end CAT6500-PFC3-IOS# Catalyst 6500 MLS QoS Verification Commands: show queueing interface Catalyst 6500 PFC2/PFC3—QoS Considerations and Design Catalyst 6500—PFC3 Distribution-Layer (IOS) Per-User Microflow Policing In general, superior defense strategies have multiple lines of defense. In the context of the campus designs that have been considered, there is a main line of defense against DoS/worm attack traffic at the access layer edges. This line of defense can be bolstered at the distribution layer whenever Catalyst 6500 Sup720s (PFC3s) are deployed there. This can be done by leveraging the PFC3 feature of Per-User Microflow Policing. In the example below, traffic has been assumed to be correctly classified. This may or may not be a valid assumption. If it is suspected to be invalid, then ACLs should be used to identify the flows (instead of DSCP markings). In either case, various flow-types can be filtered as they arrive at the distribution layer to see if they conform to the normal limits that have been set for the enterprise. Each flow is examined by source IP Address and if a source is transmitting out-of-profile, the excess traffic can be dropped or marked-down. In this manner, spurious flows can be contained even in the case that access layer switches do not support granular policing (such as the Catalyst 2950, as discussed earlier in this chapter) or in the case that policing has been mis-configured on an access layer switch. In this manner, the distribution layer Catalyst 6500 PFC3 can catch any DoS/worm attack flows that may have slipped through the access layer net. Example 2-79 Catalyst 6500 (PFC3) IOS—Distribution-Layer Per-User Microflow Policing CAT6500-PFC3-IOS(config)#mls qos map policed-dscp normal 0 24 26 34 36 to 8 ! Excess traffic marked 0,CS3,AF31,AF41 or AF42 will be remarked to CS1 CAT6500-PFC3-IOS(config)# CAT6500-PFC3-IOS(config)#class-map match-all VOIP CAT6500-PFC3-IOS(config-cmap)# match ip dscp ef CAT6500-PFC3-IOS(config-cmap)#class-map match-all INTERACTIVE-VIDEO CAT6500-PFC3-IOS(config-cmap)# match ip dscp af41 af42 CAT6500-PFC3-IOS(config-cmap)#class-map match-all CALL-SIGNALING CAT6500-PFC3-IOS(config-cmap)# match ip dscp cs3 af31 CAT6500-PFC3-IOS(config-cmap)#class-map match-all BEST-EFFORT CAT6500-PFC3-IOS(config-cmap)# match ip dscp 0 CAT6500-PFC3-IOS(config-cmap)# CAT6500-PFC3-IOS(config-cmap)#policy-map PER-USER-POLICING CAT6500-PFC3-IOS(config-pmap)# class VOIP CAT6500-PFC3-I(config-pmap-c)# police flow mask src-only 128000 8000 conform-action transmit exceed-action drop ! No source can send more than 128k worth of DSCP EF traffic CAT6500-PFC3-I(config-pmap-c)# class INTERACTIVE-VIDEO CAT6500-PFC3-I(config-pmap-c)# police flow mask src-only 500000 8000 conform-action transmit exceed-action policed-dscp-transmit ! Excess IP/VC traffic from any source is marked down to CS1 CAT6500-PFC3-I(config-pmap-c)# class CALL-SIGNALING CAT6500-PFC3-I(config-pmap-c)# police flow mask src-only 32000 8000 Enterprise QoS Solution Reference Network Design Guide 2-121
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