September 2011
59
V1.44
Copyright © 2011 Adept Systems, Inc. and Control Network Solutions Ltd All Rights Reserved.
interface since the statistics were cleared.
secsSinceClear
is the count of seconds since the statistics were last cleared.
forwardRate
is computed as the total number of packets forwarded divided by the number of
seconds since the forward rate was last calculated. The forward rate is updated whenever the
UNVT is updated and at least one second has expired since the last update.
3.4. Twin Setup Page
This page configures the twin mode redundant router feature. Twin mode is an optional
enhancement and is not activated in a standard router. If your device does not support
redundant twin mode contact Adept to find out how redundant twin mode might be activated.
This page does not appear if NAT support is enabled. Following is a brief description of each
item listed on the page
Fig.3.8: Twin Mode Setup Page
HeartBeat Time
: This sets the time period in milliseconds between cycles of the twin mode
monitoring packets. The active member of the redundant pair or
active twin
, sends out two
round trip monitoring packets during each
HeartBeat
period that test both the 709.1 and IP
interfaces of both routers. The default is 1000 ms. Increasing the
HeartBeat Time
increases the
fail over latency time. Decreasing it increases network traffic and load on the router. A practical
lower limit is 100 ms.
Timeout Cushion
: This sets the time period in milliseconds of latency cushion for the time out
for failure detection of the monitoring packets. In other words if after a time equal to HeartBeat
Time + Cushion, both monitoring packets are not detected by a router then a monitoring failure
has been deemed to have occurred. The routers then go to an active diagnostic mode. The
