简介
本文档介绍如何测试思科视频通信服务器(VCS)之间的往返延迟(RTT)。集群中的每个对等体必须位于要添加到集群中的每个其他VCS的15毫秒跳内（30毫秒RTT）。
先决条件
要求
本文档没有任何特定的要求。
使用的组件
本文档中的信息基于Cisco VCS。
本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您使用的是真实网络，请确保您已经了解所有命令的潜在影响。
相关产品
本文档也可用于以下硬件和软件版本：
- 思科 TelePresence Conductor
- Cisco Expressway核心
- Cisco Expressway边缘
测试RTT
完成以下步骤以测试RTT。
- 以根用户身份登录集群成员VCS，然后使用以下命令ping其他集群成员：
ping -i 0.03 -s 4000 10.83.23.28
- 让ping运行一到两分钟：
4008 bytes from 10.83.23.28: icmp_req=1 ttl=64 time=0.266 ms
4008 bytes from 10.83.23.28: icmp_req=2 ttl=64 time=0.213 ms
4008 bytes from 10.83.23.28: icmp_req=3 ttl=64 time=0.214 ms
4008 bytes from 10.83.23.28: icmp_req=4 ttl=64 time=0.213 ms
4008 bytes from 10.83.23.28: icmp_req=5 ttl=64 time=0.213 ms
4008 bytes from 10.83.23.28: icmp_req=6 ttl=64 time=0.218 ms
4008 bytes from 10.83.23.28: icmp_req=7 ttl=64 time=0.219 ms
4008 bytes from 10.83.23.28: icmp_req=8 ttl=64 time=0.219 ms
4008 bytes from 10.83.23.28: icmp_req=9 ttl=64 time=0.219 ms
4008 bytes from 10.83.23.28: icmp_req=10 ttl=64 time=0.221 ms
4008 bytes from 10.83.23.28: icmp_req=11 ttl=64 time=0.225 ms
4008 bytes from 10.83.23.28: icmp_req=12 ttl=64 time=0.225 ms
4008 bytes from 10.83.23.28: icmp_req=13 ttl=64 time=0.230 ms
4008 bytes from 10.83.23.28: icmp_req=14 ttl=64 time=0.227 ms
4008 bytes from 10.83.23.28: icmp_req=15 ttl=64 time=0.229 ms
4008 bytes from 10.83.23.28: icmp_req=16 ttl=64 time=0.232 ms
4008 bytes from 10.83.23.28: icmp_req=17 ttl=64 time=0.231 ms
4008 bytes from 10.83.23.28: icmp_req=18 ttl=64 time=0.230 ms
4008 bytes from 10.83.23.28: icmp_req=19 ttl=64 time=0.232 ms
4008 bytes from 10.83.23.28: icmp_req=20 ttl=64 time=0.230 ms
4008 bytes from 10.83.23.28: icmp_req=21 ttl=64 time=0.234 ms
4008 bytes from 10.83.23.28: icmp_req=22 ttl=64 time=0.233 ms
4008 bytes from 10.83.23.28: icmp_req=23 ttl=64 time=0.235 ms
4008 bytes from 10.83.23.28: icmp_req=24 ttl=64 time=0.236 ms
4008 bytes from 10.83.23.28: icmp_req=25 ttl=64 time=0.234 ms
4008 bytes from 10.83.23.28: icmp_req=26 ttl=64 time=0.236 ms
4008 bytes from 10.83.23.28: icmp_req=27 ttl=64 time=0.237 ms
4008 bytes from 10.83.23.28: icmp_req=28 ttl=64 time=0.235 ms
4008 bytes from 10.83.23.28: icmp_req=29 ttl=64 time=0.235 ms
4008 bytes from 10.83.23.28: icmp_req=30 ttl=64 time=0.218 ms
4008 bytes from 10.83.23.28: icmp_req=31 ttl=64 time=0.220 ms
4008 bytes from 10.83.23.28: icmp_req=32 ttl=64 time=0.226 ms
4008 bytes from 10.83.23.28: icmp_req=33 ttl=64 time=0.254 ms
4008 bytes from 10.83.23.28: icmp_req=34 ttl=64 time=0.214 ms
4008 bytes from 10.83.23.28: icmp_req=35 ttl=64 time=0.214 ms
4008 bytes from 10.83.23.28: icmp_req=36 ttl=64 time=0.215 ms
4008 bytes from 10.83.23.28: icmp_req=37 ttl=64 time=0.214 ms
- 按Ctrl + C，以便在1至2分钟后停止ping。输出末尾将显示具有平均RTT的摘要：
--- 10.83.23.28 ping statistics ---
159 packets transmitted, 159 received, 0% packet loss, time 4739ms
rtt min/avg/max/mdev = 0.195/0.236/0.283/0.022 ms
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