Cisco Catalyst Switch QoS Features 713
If the PFC has forwarded the frame into the egress queue, the IP DCSP value and CoS value is set as the frame is placed in the proper transmit queue. If the frame is an 802.1Q or ISL trunk frame, only the CoS value is set as the frame is placed in the proper transmit queue.
Catalyst 6500 QoS Summary
The numerous hardware options available on the Catalyst 6500 offer a wide range of customization. This section summarizes the impact of the hardware choices on the QoS performance of a Catalyst 6500 series switch.
Table 10-8 summarizes the QoS processes of the Catalyst 6500 and lists the component responsible for the function.
Table 10-8 QoS Processess of the Catalyst 6500
QoS Process |
Catalyst 6500 Component That Performs This Function |
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Input scheduling |
Performed by port application-specific integrated circuits (ASICs) |
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Layer 2 only with or without PFC |
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Classification |
Performed by supervisor or PFC |
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L2 only is done by supervisor |
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L2/3 is done by PFC |
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Policing |
Performed by PFC via L3 forwarding engine |
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Packet rewrite |
Performed by port ASICs |
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L2/L3 based on classification |
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Output scheduling |
Performed by port ASICs |
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L2/L3 based on classification |
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Table 10-9 describes the supported receive queues of the Catalyst 6500.
Table 10-9 Supported Receive Queues of the Catalyst 6500
Catalyst 6500 |
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Receive Queues |
Description |
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1q4t |
1 standard queue with 4 tail-drop thresholds |
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1p1q4t |
1 strict-priority queue, 1 standard queue with 4 tail-drop thresholds |
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1p1q0t |
1 strict-priority queue, 1 standard queue with one nonconfigurable (100%) |
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tail-drop threshold |
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1p1q8t |
1 strict-priority queue, 1 standard queue with 8 configurable WRED-drop |
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thresholds and 1 nonconfigurable (100%) tail-drop threshold |
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714 Chapter 10: LAN QoS
Table 10-10 describes the supported transmit queues of the Catalyst 6500.
Table 10-10 Supported Transmit Queues of the Catalyst 6500
Catalyst 6500 |
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Transmit Queues |
Description |
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2q2t |
2 standard queues with 2 tail-drop thresholds per queue |
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1p2q2t |
1 strict-priority queue, 2 standard queues with 2 WRED-drop thresholds per |
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queue |
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1p3q1t |
1 strict-priority queue, 3 standard queues with 1 WRED-drop threshold and |
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1 nonconfigurable tail-drop threshold per queue |
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1p2q1t |
1 strict-priority queue, 2 standard queues with 1 WRED-drop threshold and |
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1 nonconfigurable (100%) tail-drop threshold per queue |
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Table 10-11 lists the supported receive and transmit queues of the Ethernet modules for the Catalyst 6500.
Table 10-11 Supported Receive and Transmit Queues of the Ethernet Modules for the Catalyst 6500
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Module |
RX Queue |
TX Queue |
RX Queue |
TX Queue |
Ethernet Modules |
Description |
Type |
Type |
Size |
Size |
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WS-X6K-S2U-MSFC2 |
All Supervisor |
1p1q4t |
1p2q2t |
PQ: 9 KB |
PQ: 64 KB |
WS-X6K-S2-MSFC2 |
Engine II uplink |
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Q1: 64 KB |
Q2: 64 KB |
WS-X6K-S2-PFC2 |
ports |
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Q1: 311 KB |
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WS-X6K-S1A-MSFC2 |
All Supervisor |
1p1q4t |
1p2q2t |
PQ: 9 KB |
PQ: 64 KB |
WS-X6K-SUP1A-MSFC |
Engine IA uplink |
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Q1: 64 KB |
Q2: 64 KB |
WS-X6K-SUP1A-PFC |
ports |
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Q1: 311 KB |
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WS-X6K-SUP1A-2GE |
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WS-X6K-SUP1-2GE |
Supervisor Engine II |
1q4t |
2q2t |
Q1: 80 KB |
Q2: 80 KB |
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uplink ports |
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Q1: 352 KB |
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WS-X6524-100FX-MM |
24-port 100BASE- |
1p1q0t |
1p3q1t |
PQ: 6 KB |
PQ: 272 KB |
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FX fabric-enabled |
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Q1: 22 KB |
Q3: 272 KB |
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with MT-RJ |
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Q2: 272 KB |
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connectors |
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Q1: 272 KB |
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WS-X6548-RJ-21 |
48-port |
1p1q0t |
1p3q1t |
PQ: 6 KB |
PQ: 272 KB |
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10/100BASE-TX |
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Q1: 22 KB |
Q3: 272 KB |
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fabric-enabled with |
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Q2: 272 KB |
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RJ-21 connectors |
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Q1: 272 KB |
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716 Chapter 10: LAN QoS
Table 10-11 Supported Receive and Transmit Queues of the Ethernet Modules for the Catalyst 6500 (Continued)
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Module |
RX Queue |
TX Queue |
RX Queue |
TX Queue |
Ethernet Modules |
Description |
Type |
Type |
Size |
Size |
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WS-X6248A-TEL |
48-port |
1q4t |
2q2t |
Q1: 16 KB |
Q2: 22 KB |
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10/100BASE-TX |
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Q1: 90 KB |
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with RJ-21 |
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connectors |
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WS-X6148-RJ-45V |
48-port |
1q4t |
2q2t |
Q1: 16 KB |
Q2: 22 KB |
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10/100BASE-TX |
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Q1: 90 KB |
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with RJ-45 |
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connectors and |
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inline power |
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WS-X6148-RJ21V |
48-port |
1q4t |
2q2t |
Q1: 16 KB |
Q2: 22 KB |
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10/100BASE-TX |
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Q1: 90 KB |
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with RJ-21 |
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connectors and |
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inline power |
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WS-X6024-10FL-MT |
24-port |
1q4t |
2q2t |
Q1: 8 KB |
Q2: 16 KB |
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10BASE-FL with |
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Q1: 40 KB |
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MT-RJ connectors |
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WS-X6816-GBIC |
16-port |
1p1q4t |
1p2q2t |
PQ: 9 KB |
PQ: 64 KB |
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1000BASE-X |
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Q1: 64 KB |
Q2: 64 KB |
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dual-fabric with |
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Q1: 311 KB |
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GBIC connectors |
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and onboard DFC |
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WS-X6516-GBIC |
16-port |
1p1q4t |
1p2q2t |
PQ: 9 KB |
PQ: 64 KB |
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1000BASE-X with |
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Q1: 64 KB |
Q2: 64 KB |
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GBIC connectors |
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Q1: 311 KB |
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WS-X6516-GE-TX |
16-port 10/100/ |
1p1q4t |
1p2q2t |
PQ: 9 KB |
PQ: 64 KB |
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100BASE-T with |
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Q1: 64 KB |
Q2: 64 KB |
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RJ-45 connectors |
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Q1: 311 KB |
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WS-X6408-GBIC |
8-port |
1q4t |
2q2t |
Q1: 80 KB |
Q2: 80 KB |
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1000BASE-X with |
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Q1: 352 KB |
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GBIC connectors |
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WS-X6408A-GBIC |
8-port |
1p1q4t |
1p2q2t |
PQ: 9 KB |
PQ: 64 KB |
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1000BASE-X with |
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Q1: 64 KB |
Q2: 64 KB |
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GBIC connectors |
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Q1: 311 KB |
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