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6-2 FRX/FRM 3. 3 User G uide, Rev 04
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.
DLCIs used for backup on the initiating node are assigned to "backup groups," each
of which can contain up to ten backup DLCIs. A backup group is then assigned to one
or more "primary" DLCIs (the ones that will be backed up).
The basic procedure for configuring backup DLCIs is:
1. Configure all DLCIs that will be backed up or used as backups. All parameters
can be configured for each DLCI except specifying a
Backup Group Number
on a
primary DLCI (that will be backed up) on an "initiating" node (which will initiate
the switchover to a backup DLCI).
2. Configure backup groups. A backup group is one or more DLCIs that will act as
backup if the primary goes down.
3. Configure
Backup Group Number
s and related information for primary DLCIs.
This will assign a Backup Group to each primary DLCI.
For each example in Figure 6-1, assume that Node 1 will be the initiating node. On
that node, the primary DLCI is on port 4 and the backup is on port 5.
Figure 6-1 Frame Relay Backup Examples
Although each example shows an FRX6000-to-FRX4000 connection,
connections can be between any two FRX/FRM devices. In an
FRX6000, the primary and backup DLCIs must be on the same RLP.
Example 1 FRX Node 1
Example 2 FRX Node 1
Example 3 FRX Node 1
2,4,16
2,5,72
5,18
6,19
FRX Node 2
LP Port DLCI
Port DLCI
5,18
FRX Node 2
2,4,16
2,5,72
2,4,16
2,5,72
5,18
6,19
FRX Node 2
3,22 4,56
Other
Device
Other
Device