Configuring Frame Relay Backup Groups

A Frame Relay Backup Group is one or more DLCIs that can act as a backup for one or more "primary" DLCIs. If a node detects a failure in a primary DLCI connection, the software will search the backup group configured for the primary DLCI, and will select the first available DLCI in that group as a backup. The backup will become operational and will remain in that state until the primary becomes active again. If the backup fails while in use, the software will check the status of the primary, then (if necessary) search the primary's backup group for another backup.

Any sessions in progress when a primary DLCI goes down will not be transferred directly to the backup DLCI, but will be reset, then established on the backup.

To review existing backup groups, press [A] at the Frame Relay Backup Groups Con- figuration Menu (or [A], [E], [A] from the Main Menu).

To configure a backup group, press [B] at the Frame Relay Backup Groups Configu- ration Menu. When prompted, enter a Frame Relay Backup Group Number: 1–255 . (The default is 1.)

Backup Group Parameters

Table 7-6 Frame Relay Backup Group Parameters

Parameter	Valid Values		Default Value
Parameter	Valid Values		Default Value


Entry	0–9		0

Port	Voice models: 0–3
	Data-only models: 0–7		0

DLCI	16–991	1	16

WaitTimer	0–65535	(seconds)	120

Pr otEnab	Y/N		N 2
Delete? allows deleting an entry	n/a		n/a

1The DLCI must have already been created in the Port record. Also, a DLCI cannot be assigned to more than one backup group, nor can it be assigned to a backup group if it is a primary DLCI (one that will be backed up).

2See explanation.

En try

is simply an identifier.

Po rt

is the physical port on which the backup DLCI is being configured.

DLCI

is the backup being configured.

WaitTimer

is the time after a primary DLCI failure that the software will wait for this DLCI to become active before checking the next backup DLCI. If the backup does not become

7-22	SmartSwitch 1800 4. 0 User Guide, Rev 01

1800 specifications

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Cabletron Systems 1800 manual Configuring Frame Relay Backup Groups, Backup Group Parameters

Models: 1800