如何查看交换机之间的互联延迟呢

1. 组网需求

使用NQA的ICMP-jitter测试功能，测试本端（Device A）和指定目的端（Device B）之间传送报文的时延抖动。

2. 组网图

图1-3 ICMP-jitter测试组网图

3. 配置步骤

(1)     配置各接口的IP地址。（配置过程略）

(2)     配置静态路由或动态路由协议，确保各设备之间路由可达。（配置过程略）

(3)     配置Device A

# 创建ICMP-jitter类型的NQA测试组（管理员为admin，操作标签为test1）。

<DeviceA> system-view

[DeviceA] nqa entry admin test1

[DeviceA-nqa-admin-test1] type icmp-jitter

# 配置测试操作的探测报文的目的地址为10.2.2.2。

[DeviceA-nqa-admin-test1-icmp-jitter] destination ip 10.2.2.2

# 配置可选参数：测试组连续两次测试开始时间的时间间隔为1000毫秒。

[DeviceA-nqa-admin-test1-icmp-jitter] frequency 1000

[DeviceA-nqa-admin-test1-icmp-jitter] quit

# 启动ICMP-jitter测试操作，并一直进行测试。

[DeviceA] nqa schedule admin test1 start-time now lifetime forever

# 测试执行一段时间后，停止ICMP-jitter测试操作。

[DeviceA] undo nqa schedule admin test1

4. 验证配置

# 显示ICMP-jitter测试中最后一次测试的当前结果。

[DeviceA] display nqa result admin test1

NQA entry (admin admin, tag test1) test results:

    Send operation times: 10             Receive response times: 10

    Min/Max/Average round trip time: 1/2/1

    Square-Sum of round trip time: 13

    Last packet received time: 2015-03-09 17:40:29.8

  Extended results:

    Packet loss ratio: 0%

    Failures due to timeout: 0

    Failures due to internal error: 0

    Failures due to other errors: 0

    Packets out of sequence: 0

    Packets arrived late: 0

  ICMP-jitter results:

   RTT number: 10

    Min positive SD: 0                     Min positive DS: 0

    Max positive SD: 0                     Max positive DS: 0

    Positive SD number: 0                  Positive DS number: 0

    Positive SD sum: 0                     Positive DS sum: 0

    Positive SD average: 0                 Positive DS average: 0

    Positive SD square-sum: 0              Positive DS square-sum: 0

    Min negative SD: 1                     Min negative DS: 2

    Max negative SD: 1                     Max negative DS: 2

    Negative SD number: 1                  Negative DS number: 1

    Negative SD sum: 1                     Negative DS sum: 2

    Negative SD average: 1                 Negative DS average: 2

    Negative SD square-sum: 1              Negative DS square-sum: 4

    SD average: 1                          DS average: 2

  One way results:

    Max SD delay: 1                        Max DS delay: 2

    Min SD delay: 1                        Min DS delay: 2

    Number of SD delay: 1                  Number of DS delay: 1

    Sum of SD delay: 1                     Sum of DS delay: 2

    Square-Sum of SD delay: 1              Square-Sum of DS delay: 4

    Lost packets for unknown reason: 0

# 显示ICMP-jitter测试的统计结果。

[DeviceA] display nqa statistics admin test1

NQA entry (admin admin, tag test1) test statistics:

  NO. : 1

    Start time: 2015-03-09 17:42:10.7

    Life time: 156 seconds

    Send operation times: 1560           Receive response times: 1560

    Min/Max/Average round trip time: 1/2/1

    Square-Sum of round trip time: 1563

  Extended results:

    Packet loss ratio: 0%

    Failures due to timeout: 0

    Failures due to internal error: 0

    Failures due to other errors: 0

    Packets out of sequence: 0

    Packets arrived late: 0

  ICMP-jitter results:

   RTT number: 1560

    Min positive SD: 1                     Min positive DS: 1

    Max positive SD: 1                     Max positive DS: 2

    Positive SD number: 18                 Positive DS number: 46

    Positive SD sum: 18                    Positive DS sum: 49

    Positive SD average: 1                 Positive DS average: 1

    Positive SD square-sum: 18             Positive DS square-sum: 55

    Min negative SD: 1                     Min negative DS: 1

    Max negative SD: 1                     Max negative DS: 2

    Negative SD number: 24                 Negative DS number: 57

    Negative SD sum: 24                    Negative DS sum: 58

    Negative SD average: 1                 Negative DS average: 1

    Negative SD square-sum: 24             Negative DS square-sum: 60

    SD average: 16                         DS average: 2

  One way results:

    Max SD delay: 1                        Max DS delay: 2

    Min SD delay: 1                        Min DS delay: 1

    Number of SD delay: 4                  Number of DS delay: 4

    Sum of SD delay: 4                     Sum of DS delay: 5

    Square-Sum of SD delay: 4              Square-Sum of DS delay: 7

    Lost packets for unknown reason: 0