Enterprise QoS Solution Reference Network Design Guide

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Catalyst 4500 Supervisor II+/III/IV/V—QoS Considerations and Design 2-72 Enterprise QoS Solution Reference Network Design Guide Chapter 2 Campus QoS Design range 2000 2002 ! Call Signaling is matched by VVLAN subnet and TCP port-range CAT4500-SUP4(config-ext-nacl)# CAT4500-SUP4(config-ext-nacl)#ip access list extended VVLAN-ANY CAT4500-SUP4(config-ext-nacl)# permit ip 10.1.110.0 0.0.0.255 any CAT4500-SUP4(config-ext-nacl)# CAT4500-SUP4(config-ext-nacl)# CAT4500-SUP4(config-ext-nacl)#ip access list extended DVLAN-PC-VIDEO CAT4500-SUP4(config-ext-nacl)# permit udp any any range 16384 32767 CAT4500-SUP4(config-ext-nacl)# CAT4500-SUP4(config-ext-nacl)#ip access list extended DVLAN-MISSION-CRITICAL-DATA CAT4500-SUP4(config-ext-nacl)# permit tcp any any range 3200 3203 ! SAP CAT4500-SUP4(config-ext-nacl)# permit tcp any any eq 3600 ! SAP CAT4500-SUP4(config-ext-nacl)# permit tcp any any range 2000 2002 ! SCCP CAT4500-SUP4(config-ext-nacl)# CAT4500-SUP4(config-ext-nacl)#ip access list extended DVLAN-TRANSACTIONAL-DATA CAT4500-SUP4(config-ext-nacl)# permit tcp any any eq 1352 ! Lotus CAT4500-SUP4(config-ext-nacl)# CAT4500-SUP4(config-ext-nacl)#ip access list extended DVLAN-BULK-DATA CAT4500-SUP4(config-ext-nacl)# permit tcp any any eq 143 ! IMAP CAT4500-SUP4(config-ext-nacl)# permit tcp any any eq 220 ! IMAP CAT4500-SUP4(config-ext-nacl)#end CAT4500-SUP4# Catalyst 4500 QoS Verification Commands Catalyst 4500 QoS verification commands for the Conditionally-Trusted IP Phone + PC + Scavenger (Advanced) model include the following: show qos show qos maps show qos interface show class-map show policy-map show policy interface Catalyst 4500—Queuing Configuration This section includes the following topics: Configuration Catalyst 4500 QoS Verification Commands The Catalyst 4500 supports four egress queues for scheduling, which may be configured in either 4Q1T or 1P3Q1T modes. The strict-priority queue on the Catalyst 4500 is transmit-queue 3. While tail-drop or WRED thresholds are not supported on the Catalyst 4500, it does support one of the most advanced congestion avoidance mechanisms in the Catalyst family. This congestion avoidance feature is performed by Dynamic Buffer Limiting (DBL). DBL tracks the queue length for each traffic flow in the switch and when the queue length of a flow exceeds its limit, DBL drops packets or sets the (RFC 3168) Explicit Congestion Notification (ECN) bits in the IP packet headers. DBL can be enabled Version 3.3
Chapter 2 Campus QoS Design Version 3.3 Catalyst 4500 Supervisor II+/III/IV/V—QoS Considerations and Design globally with the qos dbl global command, as well as on a per-class basis within a policy-map with the dbl policy command. A default DBL policy can be applied to all transmit queues, as is shown in the example below. By default, all queues are scheduled in a round robin manner. The third transmit queue can be designated as an optional strict-priority queue. This can be enabled with the tx-queue 3 interface command followed by the priority high interface transmit-queue sub-command. This queue can be defined to be shaped to a peak limit, such as 30%, to allow bandwidth to be available to non-voice applications. This would be valuable in the event that a trust boundary has been compromised and a DoS/worm attack is saturating voice queues. Bandwidth allocations can also be assigned to queues (for certain interfaces) using the tx-queue interface command followed by the bandwidth sub-command. Bandwidth allocations to queues can only be assigned on the following interface types: Uplink ports on supervisor engines Ports on the WS-X4306-GB linecard The 2 1000BASE-X ports on the WS-X4232-GB-RJ linecard The first 2 ports on the WS-X4418-GB linecard The two 1000BASE-X ports on the WS-X4412-2GB-TX linecard The Catalyst 4500 does not support CoS-to-Queue mappings, only DSCP-to-Queue mappings. These can be defined with the qos map dscp to tx-queue global command. Given these features and the objective to make queuing consistent across platforms, it is recommended to enable DBL globally on the Catalyst 4500, as well as enable Q3 as the strict-priority queue on all interfaces (such that the switch operates in 1P3Q1T mode). This queue can be shaped to 30% of the link’s capacity. Furthermore, Q1 can then be used as the Scavenger/Bulk queue, Q2 as the Best-Effort queu,e and Q4 as the preferential queue. On interfaces that support bandwidth allocation, 5% could be assigned to Q1, 25% to Q2, and 40% to Q3. Unlike bandwidth-weights that are used on other platforms, these bandwidth allocations are defined in absolute bps or as relative percentages of the link’s bandwidth. In either case, they should not total in excess of the link’s bandwidth-limit (1 Gbps or 100%), including the priority-bandwidth allocation for Q3. By default, the DSCP-to-Queue assignments are as follows: DSCP 0-15 Queue 1 DSCP 16-31 Queue 2 DSCP 32-47 Queue 3 DSCP 48-63 Queue 4 The recommended DSCP-to-Queue assignments for the Catalyst 4500 are as follows: DSCP 0 should be assigned to Q2 DSCP CS1 (Scavenger) and DSCP AF11/AF12/AF13 (Bulk Data) should be assigned to Q1 DSCP CS2 (Network Management) as well as AF21/AF22/AF23 (Transactional Data) should be assigned to Q4 DSCP CS3 and AF31 (Call-Signaling) should be assigned to Q4 DSCP 25 (temporary marking for Mission-Critical Data) should be assigned to Q4 DSCP CS4 (Streaming Video) and AF41/AF42/AF43 (Interactive Video) should be assigned to Q4 DSCP EF (Voice) should be assigned to Q3 (the strict priority queue) Enterprise QoS Solution Reference Network Design Guide 2-73
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