| Dialer interfaces can be configured as
the logical intermediary between physical interfaces. The dialer
interface is the backup interface for the primary link. If the
primary connection fails or is overutilized, the dialer interface
kicks in and enlists a physical interface, typically BRI, to place
the call.
To configure a dialer interface and a
specific physical interface to function as backup to other physical
interfaces, perform the following steps:
- Create and configure a dialer
interface.
- The table in Figure
reviews ways to configure a dialer interface.
- Make the interface to be used as backup a member of the
dialer pool by using the
dialer pool member number
command.
- You must then configure the primary interface to use a
backup.
- Enter interface configuration mode for the primary interface.
- Assign an address to your interface.
- Specify the backup interface dialer to be used with the
backup
interface dialer number
command.
Example
shows
the configuration of a site that backs up a leased line by using a
BRI interface. One dialer interface, dialer 0, is defined. The
leased line (serial 0) is configured to use the dialer interface
(dialer 0) as a backup. The dialer interface uses dialer pool 1,
which has physical interface BRI 0 as a member. Thus, physical
interface BRI 0 can back up the serial interface.
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Lab
Activity |
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You
have been asked to implement a DDR dial backup
link to backup the Frame Relay network between
Orlando and Atlanta. You have installed an
ISDN line in Orlando to make this possible.
Now that Orlando has ISDN, you have come up
with the idea to take advantage of that line
so that you can connect to the Minneapolis
office which also has an ISDN line. Configure
a DDR connection between Orlando and
Minneapolis. Because Orlando will be using the
same line to connect to two different
locations, you must use dialer profiles to
make this possible. |
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