3Com 3036, Configuration Manual

Page: 653 / 762

Configuring the Standby Center 649
Setting the Delay Time
for Switchover between
Main and Standby
Interface
When the state of the main interface changes from up to down, the system
doesn't switch to a standby interface immediately, but waits for a preset time
delay instead. The system switches to the standby interface only if the state of the
main interface remains down after the delay times out. If the main interface
recovers within the delay time, the system will not switch to the standby interface.
Table 699 Set the Delay Time for the Switchover from the Main Interface to the Standby
Interface
By default, the delay time for the switchover from the main interface to the
standby interface is 0 second, meaning that the switchover is instanteous.
When the state of the main interface changes from down to up, the system
doesn't switch to the main interface immediately, but wait for a preset time delay
instead. The system will switch back to the main interface only if the state of the
main interface remains 'up' after the delay time runs out; if the main interface
restores its down state again within the delay time, the system will not switch to
the main interface.
Perform the following configurations in the view of the backed up main interface.
Table 700 Set the Delay Time for the Switchover from the Standby Interface to the Main
Interface
By default, the delay time for the switchover from the standby interface to the
main interface is 0 second, meaning that the switchover is instanteous.
Setting State-judging
Conditions of the Logic
Channel State
When the main interface is a logic channel, the logic channel is regarded as down
after a specified number of unsuccessful calls. After it switches over to the standby
interface, regular inspections at specified time intervals must be made on the logic
channel to check whether it has recovered.
If the main interface has multiple standby interfaces, of which one is a logic
channel, it's necessary to judge whether the logic channel is down or up before
opening it. If it is down, open the standby interface with the second highest
Specify a logic channel number for frame
relay virtual circuit
fr map protocol address dlci dlci
logic-channel number
Specify a logic channel number for Dialer
Route
dialer route protocol
next-hop-address dialer-number
logic-channel number
Operation Command
Set the delay time for the switchover from
the main interface to the standby interface
standby timer enable-delay seconds
Restore the default delay time for the
switchover from the main interface to the
standby interface
undo standby timer enable-delay
Operation Command
Set the delay time for the switchover from
the standby interface to the main interface
standby timer disable-delay seconds
Restore the default delay time for the
switchover from the standby interface to
the main interface
undo standby timer disable-delay