The round-trip time (RTT) between cluster nodes should be less than 100 ms.

To check the round-trip time of a Cryptographic Security Platform cluster

1. Log in to any node of the cluster.
2. Run the following command: 
   ping -c 20 <node>
   Where <node> is the domain name or IP address of another node in the same cluster.
3. Check the statistics at the end of the command output. For example, the following command output shows that the average RTT is 0.432 ms. 
   $ ping -c 20 10.1.141.175

   PING 10.1.141.175 (10.1.141.175) 56(84) bytes of data.

   64 bytes from 10.1.141.175: icmp_seq=1 ttl=64 time=0.718 ms

   64 bytes from 10.1.141.175: icmp_seq=2 ttl=64 time=0.376 ms

   64 bytes from 10.1.141.175: icmp_seq=3 ttl=64 time=0.382 ms

   64 bytes from 10.1.141.175: icmp_seq=4 ttl=64 time=0.371 ms

   64 bytes from 10.1.141.175: icmp_seq=5 ttl=64 time=0.412 ms

   64 bytes from 10.1.141.175: icmp_seq=6 ttl=64 time=0.418 ms

   64 bytes from 10.1.141.175: icmp_seq=7 ttl=64 time=0.363 ms

   64 bytes from 10.1.141.175: icmp_seq=8 ttl=64 time=0.372 ms

   64 bytes from 10.1.141.175: icmp_seq=9 ttl=64 time=0.641 ms

   64 bytes from 10.1.141.175: icmp_seq=10 ttl=64 time=0.327 ms

   64 bytes from 10.1.141.175: icmp_seq=11 ttl=64 time=0.463 ms

   64 bytes from 10.1.141.175: icmp_seq=12 ttl=64 time=0.380 ms

   64 bytes from 10.1.141.175: icmp_seq=13 ttl=64 time=0.417 ms

   64 bytes from 10.1.141.175: icmp_seq=14 ttl=64 time=0.412 ms

   64 bytes from 10.1.141.175: icmp_seq=15 ttl=64 time=0.363 ms

   64 bytes from 10.1.141.175: icmp_seq=16 ttl=64 time=0.427 ms

   64 bytes from 10.1.141.175: icmp_seq=17 ttl=64 time=0.289 ms

   64 bytes from 10.1.141.175: icmp_seq=18 ttl=64 time=0.274 ms

   64 bytes from 10.1.141.175: icmp_seq=19 ttl=64 time=0.705 ms

   64 bytes from 10.1.141.175: icmp_seq=20 ttl=64 time=0.536 ms

    

   --- 10.1.141.175 ping statistics ---

   20 packets transmitted, 20 received, 0% packet loss, time 19434ms

   rtt min/avg/max/mdev = 0.274/0.432/0.718/0.122 ms