we are maintaining 150 site for one of the US client, For all the sites we are having MPLS link as primary & ISDN link as secondary, Now my client is requesting us to send Monthly report for working ISDN links.
Is there any way to test the ISDN (BRI) Link with out dropping the MPLS link,
duering this test all also all my traffic has to go through the MPLS only.
Pls Someone help me on this.
As Giuseppe explains when DDR is configured using backup-interface then it puts the backup interface (dialer75 in your case) into a special state where the interface can not make a call and can not receive a call unless the primary interface goes into state protocol down. This means that you can not test with the backup interface without taking the primary interface down.
As Giuseppe explains, one alternative is to remove the backup-interface command on the primary interface. This allows the dialer75 interface to be used in testing. Another alternative is to configure another dialer interface with parameters similar to dialer75. Since the other dialer interface is not configured as a backup-interface it can be configured with the same dialer string and can be used to test the ISDN without impacting the backup-interface configuration.
as Rick has suggested the DDR is triggered by the backup interface that references the dialer interface.
backup interface Dialer75
I'm afraid that the dialer interface is kept down by the backup interface command.
However, instead of tearing down the mpls link you could:
remove the backup interface dialer75 interface under the primary WAN link
make the tests as suggested in the first posts
reapply the backup interface command
in this way you can test the ISDN link without disturbing the service.
Of course this test is not complete because the DDR is not tested with the backup command.
Here, if this is enough or not becomes a question of test specifications.
Hope to help
ping the dialer interface of the remote router from the local router dialer interface using extended ping.