Paradyne CSU User Manual download pdf (Page 148)

4. Configuration Options

4-104

September 2002 9128-A2-GB20-80

Configuring the Criteria for Automatic Backup

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

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

control and terminate backup, or set delays (see Table 4-26, Auto Backup Criteria

Options).

Main Menu

→

Configuration

→

Auto Backup Criteria

Table 4-26. 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 Table 4-18, 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 Table 4-1, 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 wait 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.

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