03-19-2018 10:23 AM
I would like to know the calculation logic of average RTT of portshow output.
How long the duration of this average?
B7840-2:admin> portshow fciptunnel 24
Tunnel: VE-Port:24 (idx:0, DP0)
Oper State : Online
TID : 24
Flags : 0x00000000
IP-Extension : Enabled
Sender Stats : 2204345 bytes / 7899 pkts / 58.00 Bps Avg
TCP Bytes In/Out : 189815566 / 190228905
ReTx/OOO/SloSt/DupAck: 341 / 0 / 28 / 0
RTT (min/avg/max) : 1 / 1 / 1 ms <=============== This "avg" value
Wan Util : 2.2%
TxQ Util : 0.0%
03-19-2018 10:21 PM
see follow note about RTT
Delay, or latency, is the amount of time that it takes a packet of data to get from one point to another. Delay is often measured by sending a packet that is returned to the sender; the packets round-trip time (RTT) is considered the delay in the network. In an IP network, delay depends not only on distance, but also upon router hop count, router processing, and packet size. A reasonable rule of thumb to estimate delay is driving distance multiplied by 1.5.
For more details, i would suggest to consult BPMSNA ( Brocade Professional Mainframe Storage Networking Architect ) Web Based Training, here example in Chapter 10-28
03-19-2018 11:26 PM
My question was not good.
I understand the meaning of RTT.
I would like to know the monitoring duration period of average RTT value when using portshow command with "--reset" option (time based set of statistics).