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100

101

Customizing ISDN Lines

308621-14.00 Rev 00

11-5

Modifying the ISDN Channel Priority

You can modify the ISDN pool channel priority to prioritize channels in a pool,

instructing the router which line to use first, second, and so on when a dial line is

required.

The lower the number you assign to an interface, the higher its priority.

The channel priority is part of the ISDN logical line configuration because it

defines the logical B channels, not the physical line. Before changing the logical

line configuration, you must delete all circuits associated with that pool. For

instructions, see the appropriate customizing chapter for circuits.

For dial backup and bandwidth-on-demand pools, lines can reside across slots, but

setting the line priority affects only lines on the same slot. For example, if the

backup pool has two lines on slot 3 and two lines on slot 4, the router sets a

priority between the lines on slot 3, then between the lines on slot 4. For

bandwidth-on-demand, the router prioritizes lines in the preferred slot, then the

reserved slot, and finally, the local slot.

Using the BCC

To prioritize ISDN lines in a demand or backup pool, navigate to the demand-line

or backup-line prompt and enter:

isdn-pool-priority

integer

is a number from 1 to 50.

For example:

demand-line/1/bri/1/1/2#

isdn-pool-priority 1

This command tells the router to use the line for slot 3 connector 3 first for a

backup line.

This parameter works with the

line-priority

parameter for serial lines. For

example, if a pool has a serial line and an ISDN line, you can set the serial line to

line-priority

of 1 and the ISDN line to an

isdn-pool-priority

of 2.

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