Enterprise QoS Solution Reference Network Design Guide
Enterprise QoS Solution Reference Network Design Guide
Enterprise QoS Solution Reference Network Design Guide
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Chapter 2 Campus <strong>QoS</strong> <strong>Design</strong><br />
Version 3.3<br />
Catalyst 6500 PFC2/PFC3—<strong>QoS</strong> Considerations and <strong>Design</strong><br />
Example 2-66 Show <strong>QoS</strong> Info Runtime Verification for a Catalyst 6500-CatOS Switch<br />
CAT6500-PFC3-CATOS> (enable) show qos info runtime 3/1<br />
Run time setting of <strong>QoS</strong>:<br />
<strong>QoS</strong> is enabled<br />
Policy Source of port 3/1: Local<br />
Tx port type of port 3/1 : 2q2t<br />
Rx port type of port 3/1 : 1q4t<br />
Interface type: port-based<br />
ACL attached:<br />
The qos trust type is set to untrusted.<br />
Default CoS = 0<br />
Queue and Threshold Mapping for 2q2t (tx):<br />
Queue Threshold CoS<br />
----- --------- ---------------<br />
1 1 1<br />
1 2 0<br />
2 1 2 3 4 6 7<br />
2 2 5<br />
Queue and Threshold Mapping for 1q4t (rx):<br />
All packets are mapped to a single queue.<br />
Rx drop thresholds:<br />
Rx drop thresholds are disabled.<br />
Tx drop thresholds:<br />
Queue # Thresholds - percentage (* abs values)<br />
------- -------------------------------------<br />
1 40% (6144 bytes) 100% (15360 bytes)<br />
2 80% (28672 bytes) 100% (35840 bytes)<br />
Rx WRED thresholds:<br />
Rx WRED feature is not supported for this port type.<br />
Tx WRED thresholds:<br />
WRED feature is not supported for this port type.<br />
Tx queue size ratio:<br />
Queue # Sizes - percentage (* abs values)<br />
------- -------------------------------------<br />
1 30% (17408 bytes)<br />
2 70% (37888 bytes)<br />
Rx queue size ratio:<br />
Rx queue size-ratio feature is not supported for this port type.<br />
Tx WRR Configuration of ports with speed 10Mbps:<br />
Queue # Ratios (* abs values)<br />
------- -------------------------------------<br />
1 30 (7648 bytes)<br />
2 70 (17840 bytes)<br />
(*) Runtime information may differ from user configured setting due to hardware<br />
granularity.<br />
CAT6500-PFC3-CATOS> (enable)<br />
The Catalyst 6500 IOS configurations to configure 2Q2T queuing recommendations are shown below.<br />
Example 2-67 Catalyst 6500 IOS—2Q2T Queuing Example<br />
CAT6500-PFC3-IOS(config)# interface range FastEthernet6/1 - 48<br />
CAT6500-PFC3-IOS(config-if)# wrr-queue queue-limit 30 70<br />
! Sets the buffer allocations to 30% for Q1 and 70% for Q2<br />
CAT6500-PFC3-IOS(config-if)# wrr-queue bandwidth 30 70<br />
! Sets the WRR weights for 30:70 (Q1:Q2) bandwidth servicing<br />
CAT6500-PFC3-IOS(config-if)#<br />
CAT6500-PFC3-IOS(config-if)# wrr-queue threshold 1 40 100<br />
! Sets Q1T1 to 5% to limit Scavenger/Bulk from dominating Q1<br />
CAT6500-PFC3-IOS(config-if)# wrr-queue threshold 2 80 100<br />
! Sets Q2T1 to 80% to always have room in Q2 for VoIP<br />
CAT6500-PFC3-IOS(config-if)#<br />
<strong>Enterprise</strong> <strong>QoS</strong> <strong>Solution</strong> <strong>Reference</strong> <strong>Network</strong> <strong>Design</strong> <strong>Guide</strong><br />
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