簡介
本文說明如何測試思科視訊通訊伺服器(VCS)之間的來回延遲(RTT)。群集中的每個對等體必須位於要新增到群集中的每個其他VCS的15毫秒跳內（30毫秒RTT）。
必要條件
需求
本文件沒有特定需求。
採用元件
本檔案中的資訊是根據Cisco VCS。
本文中的資訊是根據特定實驗室環境內的裝置所建立。文中使用到的所有裝置皆從已清除（預設）的組態來啟動。如果您的網路正在作用，請確保您已瞭解任何指令可能造成的影響。
相關產品
本文件也適用於以下硬體和軟體版本：
- Cisco TelePresence Conductor
- Cisco Expressway核心
- Cisco Expressway邊緣
測試RTT
完成以下步驟以測試RTT。
- 以root身份登入到群整合員VCS，然後使用以下命令對另一個群整合員執行ping:
ping -i 0.03 -s 4000 10.83.23.28
- 讓ping執行一到兩分鐘：
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
- 按下Ctrl + C可在一到兩分鐘後停止ping。輸出末尾將顯示一個具有平均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
意見