输出调度用于确保重要业务在严重超量预订的情况下不会被丢弃。本文将说明所有涉及Catalyst 6000交换机输出调度的技术和算法。本文还将重点说明如何在运行集成Cisco IOS®（本机模式）的Catalyst 6000上对输出调度进行配置，如何检验操作。
如果您想知道有关加权早期随机检测（WRED）、加权循环（WRR）以及尾端丢弃的详细信息，或者您的Catalyst 6
Catalyst 6000上不同线路卡的输出队列能力
如果您并不确定某个端口的队列能力，那么首先要做的就是发出 show queueing interface <gig | fast et> <mod/port> 命令。以下是SUP1A线路卡上一个端口的 show queueing interface 命令输出的前几行：
cosmos#show queueing interface gig 1/1
Interface GigabitEthernet1/1 queueing strategy: Weighted Round-Robin
QoS is disabled globally
Trust state: trust DSCP
Default COS is 0
Transmit group-buffers feature is enabled
Transmit queues [type = 1p2q2t]:
Queue Id Scheduling Num of thresholds
-----------------------------------------
1 WRR low 2
2 WRR high 2
3 Priority 1
.....(output truncated)
正如您所看到的，该端口的输出队列类型称为1p2q2。
了解端口的队列能力
Catalyst 6000以及6500交换机上有好几种队列类型。下表说明了端口QoS体系结构的表示方法。
| 发送/接收端 | 队列表示法 | 队列数量 | 优先级队列 | WRR队列数量 | WRR队列数量及类型阈值 |
| Tx | 2q2t | 2 | - | 2 | 2 configurable Tail-Drop |
| Tx | 1p2q2t | 3 | 1 | 2 | 2 configurable WRED |
| Tx | 1p3q1t | 4 | 1 | 3 | 1 configurable WRED |
| Tx | 1p2q1t | 3 | 1 | 2 | 1 configurable WRED |
| Rx | 1q4t | 1 | - | 1 | 4 configurable Tail-Drop |
| Rx | 1p1q4t | 2 | 1 | 1 | 4 configurable Tail-Drop |
| Rx | 1p1q0t | 2 | 1 | 1 | Not configurable |
| Rx | 1p1q8t | 2 | 1 | 1 | 8 configurable WRED |
下表列出接口/端口接收与发送侧的所有模块以及队列类型。
| 模块 | 接收队列 | 发送队列 |
| WS-X6K-S2-PFC2 | 1p1q4t | 1p2q2t |
| WS-X6K-SUP1A-2GE | 1p1q4t | 1p2q2t |
| WS-X6K-SUP1-2GE | 1q4t | 2q2t |
| WS-X6501-10GEX4 | 1p1q8t | 1p2q1t |
| WS-X6502-10GE | 1p1q8t | 1p2q1t |
| WS-X6516-GBIC | 1p1q4t | 1p2q2t |
| WS-X6516-GE-TX | 1p1q4t | 1p2q2t |
| WS-X6416-GBIC | 1p1q4t | 1p2q2t |
| WS-X6416-GE-MT | 1p1q4t | 1p2q2t |
| WS-X6316-GE-TX | 1p1q4t | 1p2q2t |
| WS-X6408A-GBIC | 1p1q4t | 1p2q2t |
| WS-X6408-GBIC | 1q4t | 2q2t |
| WS-X6524-100FX-MM | 1p1q0t | 1p3q1t |
| WS-X6324-100FX-SM | 1q4t | 2q2t |
| WS-X6324-100FX-MM | 1q4t | 2q2t |
| WS-X6224-100FX-MT | 1q4t | 2q2t |
| WS-X6548-RJ-21 | 1p1q0t | 1p3q1t |
| WS-X6548-RJ-45 | 1p1q0t | 1p3q1t |
| WS-X6348-RJ-21 | 1q4t | 2q2t |
| WS-X6348-RJ21V | 1q4t | 2q2t |
| WS-X6348-RJ-45 | 1q4t | 2q2t |
| WS-X6348-RJ-45V | 1q4t | 2q2t |
| WS-X6148-RJ-45V | 1q4t | 2q2t |
| WS-X6148-RJ21V | 1q4t | 2q2t |
| WS-X6248-RJ-45 | 1q4t | 2q2t |
| WS-X6248A-TEL | 1q4t | 2q2t |
| WS-X6248-TEL | 1q4t | 2q2t |
| WS-X6024-10FL-MT | 1q4t | 2q2t |
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