3. Configuration Options
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Configuring the Criteria for Automatic Backup

For units with an ISDN DBM, follow this menu selection sequence to specif y

whether and when automatic backup is allowed, and to configure timers that will

control and terminate backup, or set delays (see Table 3-40, Auto Backup Criteria

Options).

Main Menu→Configuration→Auto Backup Criteria

Table 3-40. Auto Backup Criteria Options (1 of 2)

Auto Backup
Possible Settings: Enable, Disable
Default Setting: Disable
Determines whether backup for the access unit is automatically performed when the
primary physical link or LMI, or a DLCI on a PVC connection fails, or when latency is
exceeded.
When enabled, the access unit automatically enables the Alternate Link configuration
option, and establishes an alternate DLCI and EDLCI, rerouting traffic over the backup
interface. (See Table3-32, Management PVC Options, to configure the alternate DLCI
and alternate EDLCI.)
NOTE: Auto Backup cannot be enabled unless LMI Behavior is set to Independent
(see Table3-1, System Frame Relay and LMI Options).
Enable – Reroutes traffic over the backup (alternate) interface.
Disable – Does not reroute traffic over the backup interface.
DLCI Down Backup Activation Delay (sec)
Possible Settings: 0 – 3600
Default Setting: 0
Specifies the number of seconds the unit will wai t once a DLCI is declared down before it
initiates backup. A DLCI is declared down when the DLCI changes to Inactive status in an
LMI response, or when there is an LMI or physical link failure. When a delay is configured,
the unit is more tolerant of network glitches, or repeated short outages, before going into
backup, minimizing bouncing between network and backup services.
0 – 3600 – Specifies the amount of time for the delay.
DLCI Down Backup Activation Transition Threshold
Possible Settings: 1 – 10
Default Setting: 1
Specifies how many times a primary destination DLCI transitions up or down during the
DLCI Down Backup Activation Delay period before the unit initiates backup, provided the
DLCI is active when the delay period ends.
1 – 10 – Specifies the number of transitions allowed between Active and Inactive status.
Backup Restoration Delay (sec)
Possible Settings: 0 – 3600
Default Setting: 0
Specifies the number of seconds the unit will wait after all backup alarm conditions have
cleared for a primary destination DLCI before the backup connection is terminated.
0 – 3600 – Specifies the amount of time for the delay.