Time-Based ACL for ISDN Connectivity

There are 4 things to consider:

1. Define the Time-Range (under global config mode):
time-range isdn-hours
absolute start 00:00 01 January 2009
periodic weekdays 7:00 to 19:00

2. An Access List needs to be created for defining the interesting traffic & tying the Time-Range (under global config mode):
access-list 100 remark ACL for ISDN interesting traffic definition
access-list 100 deny ospf any any
access-list 100 permit ip any any time-range isdn-hours

3. Create a Dialer List with a Reference to access-list 100, as follows (under global config mode):
dialer-list 1 protocol ip list 100

4. Apply the Dialer List to the ISDN Interface (under global config mode):
interface BRI0
dialer-group 1

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