With dialer profiles, the BRI
connection in the Figure
can be used to back up the primary Frame Relay link between the
central site and the branch office. At the same
time, it can be configured for DDR between Branch Office A and
Branch Office B (as shown in the Figure ).
Configure one dialer
profile to act as the backup line. This profile is in standby mode
until engaged. Configure another dialer profile for legacy DDR
between the Branch Office A and Branch Office B. Make the
physical BRI interface a member of both dialer pools. When
you use a BRI for a dial backup, neither of the B channels can be
used while the interface is in standby mode. In addition, when a BRI
is used as a backup interface and the BRI is configured for Legacy
DDR, only one B channel is usable. After the backup is initiated over
one B channel, the second B channel is unavailable. When the backup
interface is configured for dialer profiles, both B channels can be
used.
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