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 />
Configuration<br />
Version 3.3<br />
Catalyst 6500 PFC2/PFC3—<strong>QoS</strong> Considerations and <strong>Design</strong><br />
Once the queues and thresholds have been defined as above, then CoS 1 (Scavenger/Bulk) can be<br />
assigned to Q1T1; CoS 0 (Best Effort) can be assigned to Q1T2; CoS 2 (<strong>Network</strong> Management and<br />
Transactional Data), CoS 3 (call signaling and Mission-Critical Data), CoS 4 (Interactive and Streaming<br />
Video), and CoS 6 and 7 (Internetwork and <strong>Network</strong> Control) can be assigned to Q21T; and CoS 5 (VoIP)<br />
can be assigned to Q2T2.<br />
These 2Q2T queuing recommendations are illustrated in Figure 2-26.<br />
Figure 2-26 Catalyst 6500 2Q2T Queuing Model<br />
Application<br />
<strong>Network</strong> Control<br />
Internetwork Control<br />
Voice<br />
Interactive-Video<br />
Streaming-Video<br />
Mission-Critical Data<br />
Call-Signaling<br />
Transactional Data<br />
<strong>Network</strong>-Management<br />
Bulk Data<br />
Scavenger<br />
Best-Effort<br />
DSCP<br />
-<br />
CS6<br />
EF<br />
AF41<br />
CS4<br />
DSCP 25<br />
AF31/CS3<br />
AF21<br />
CS2<br />
AF11<br />
CS1<br />
0<br />
CoS 6<br />
CoS 5<br />
CoS 4<br />
CoS 4<br />
CoS 3<br />
CoS 3<br />
CoS 2<br />
CoS 2<br />
CoS 1<br />
CoS 1<br />
The Catalyst 6500 CatOS configurations to configure 2Q2T queuing recommendations<br />
are shown below.<br />
Example 2-64 Catalyst 6500 CatOS—2Q2T Queuing Example<br />
CoS<br />
CoS 7<br />
0<br />
CAT6500-PFC2-CATOS> (enable) set qos txq-ratio 2q2t 30 70<br />
! Sets the buffer allocations to 30% for Q1 and 70% for Q2<br />
CAT6500-PFC2-CATOS> (enable) set qos wrr 2q2t 30 70<br />
! Sets the WRR weights for 30:70 (Q1:Q2) bandwidth servicing<br />
CAT6500-PFC2-CATOS> (enable)<br />
CAT6500-PFC2-CATOS> (enable) set qos drop-threshold 2q2t tx queue 1 40 100<br />
! Sets Q1T1 to 5% to limit Scavenger/Bulk from dominating Q1<br />
CAT6500-PFC2-CATOS> (enable) set qos drop-threshold 2q2t tx queue 2 80 100<br />
! Sets Q2T1 to 80% to always have room in Q2 for VoIP<br />
CAT6500-PFC2-CATOS> (enable)<br />
CAT6500-PFC2-CATOS> (enable) set qos map 2q2t tx 1 1 cos 1<br />
! Assigns Scavenger/Bulk to Q1T1<br />
CAT6500-PFC2-CATOS> (enable) set qos map 2q2t tx 1 2 cos 0<br />
! Assigns Best Effort to Q1T2<br />
CAT6500-PFC2-CATOS> (enable) set qos map 2q2t tx 2 1 cos 2,3,4,6,7<br />
! Assigns CoS 2,3,4,6 and 7 to Q2T1<br />
CAT6500-PFC2-CATOS> (enable) set qos map 2q2t tx 2 2 cos 5<br />
! Assigns VoIP to Q2T2<br />
CAT6500-PFC2-CATOS> (enable)<br />
CoS 5<br />
CoS 7<br />
CoS 6<br />
CoS 4<br />
CoS 3<br />
CoS 2<br />
CoS 0<br />
CoS 1<br />
2Q2T<br />
Queue 2<br />
(70%)<br />
Queue 1<br />
(30%)<br />
Q2T2<br />
Q2T1<br />
Q1T2<br />
Q1T1<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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