Brocade Communications Systems 12.4.00 Manual De Usuario
ServerIron ADX Global Server Load Balancing Guide
139
53-1002437-01
Smoothing mechanism for RTT measurements
1
RTT state before application of RTT smoothing mechanism:
------------------------------------------------------------------
RTT val = 114, RTT decimal val = 0.0
Applied RTT smoothing algorithm for new RTT sample 30
RTT state after application of RTT smoothing mechanism:
----------------------------------------------------------------
RTT value after smoothing = 105, RTT decimal val = 0.0
GSLB-ServerIronADX(config-gslb-rtt-sim-test)# rtt-val 30
SIMULATOR: Enhanced RTT smoothing is OFF
RTT state before application of RTT smoothing mechanism:
------------------------------------------------------------------
RTT val = 105, RTT decimal val = 0.0
Applied RTT smoothing algorithm for new RTT sample 30
RTT state after application of RTT smoothing mechanism:
----------------------------------------------------------------
RTT value after smoothing = 97, RTT decimal val = 0.0
GSLB-ServerIronADX(config-gslb-rtt-sim-test)# rtt-val 30
SIMULATOR: Enhanced RTT smoothing is OFF
RTT state before application of RTT smoothing mechanism:
------------------------------------------------------------------
RTT val = 97, RTT decimal val = 0.0
Applied RTT smoothing algorithm for new RTT sample 30
RTT state after application of RTT smoothing mechanism:
----------------------------------------------------------------
RTT value after smoothing = 90, RTT decimal val = 0.0
GSLB-ServerIronADX(config-gslb-rtt-sim-test)# exit
Example
The following example simulates the enhanced RTT smoothing mechanism for the same set of RTT
samples used above; however, since parameters for the feature have not been configured for the
Site "test", default values of the parameters are used.
samples used above; however, since parameters for the feature have not been configured for the
Site "test", default values of the parameters are used.
GSLB-ServerIronADX# configure terminal
GSLB-ServerIronADX(config)# gslb simulate-rtt-smoothing test 30
GSLB-ServerIronADX(config-gslb-rtt-sim-test)# enable-sim-new-rtt-smooth
GSLB-ServerIronADX(config-gslb-rtt-sim-test)#rtt-val 1
SIMULATOR: Enhanced RTT smoothing is ON
RTT sample value 1 is acceptable
RTT state before application of enhanced RTT smoothing mechanism:
------------------------------------------------------------------
RTT val = 30, RTT decimal val = 0.0
ignore-larger-rtt-count = 0
ignore-smaller-rtt-count = 0, increment-rtt-factor = 1
Applied enhanced RTT smoothing algorithm for new RTT sample 1
RTT state after application of enhanced RTT smoothing mechanism:
----------------------------------------------------------------
RTT value after smoothing = 27, RTT decimal val = 0.100
ignore-larger-rtt-count = 0
ignore-smaller-rtt-count = 0, increment-rtt-factor = 1
GSLB-ServerIronADX(config-gslb-rtt-sim-test)#rtt-val 1000
SIMULATOR: Enhanced RTT smoothing is ON
RTT sample value 1000 is not acceptable (higher)
RTT state before application of enhanced RTT smoothing mechanism:
------------------------------------------------------------------
RTT val = 27, RTT decimal val = 0.100
ignore-larger-rtt-count = 0
ignore-smaller-rtt-count = 0, increment-rtt-factor = 1
Applied enhanced RTT smoothing algorithm for new RTT sample 1000
RTT state after application of enhanced RTT smoothing mechanism: