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    can be tested without using pings or even before assigning IP addresses to the BRI interfaces!

    It's a good idea to place these test calls before

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    To earn your Cisco CCNA and CCNP certifications, you've got to master ISDN - and despite what some people say, there's still a lot of ISDN out there that needs to be supported. And when it comes to troubleshooting ISDN, there's a lot to look at. Is the correct ISDN switchtype configured? Are the dialer map statements correct? What about the dialer-group and dialer-list commands? And that's just the start.

    I always say that all troubleshooting starts at Layer 1, the Physical layer of the OSI model. The usual method of troubleshooting ISDN is sending pings across the link, but the connection can be tested without using pings or even before assigning IP addresses to the BRI interfaces!

    It's a good idea to place these test calls before

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    at needs to be supported. And when it comes to troubleshooting ISDN, there's a lot to look at. Is the correct ISDN switchtype configured? Are the dialer map statements correct? What about the dialer-group and dialer-list commands? And that's just the start.

    I always say that all troubleshooting starts at Layer 1, the Physical layer of the OSI model. The usual method of troubleshooting ISDN is sending pings across the link, but the connection can be tested without using pings or even before assigning IP addresses to the BRI interfaces!

    It's a good idea to place these test calls before

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    er map statements correct? What about the dialer-group and dialer-list commands? And that's just the start.

    I always say that all troubleshooting starts at Layer 1, the Physical layer of the OSI model. The usual method of troubleshooting ISDN is sending pings across the link, but the connection can be tested without using pings or even before assigning IP addresses to the BRI interfaces!

    It's a good idea to place these test calls before

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    g starts at Layer 1, the Physical layer of the OSI model. The usual method of troubleshooting ISDN is sending pings across the link, but the connection can be tested without using pings or even before assigning IP addresses to the BRI interfaces!

    It's a good idea to place these test calls before

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    can be tested without using pings or even before assigning IP addresses to the BRI interfaces!

    It's a good idea to place these test calls before configuring the interfaces - that way, you know you've got a valid connection before beginning the configuration (and there's a lot of config to go along with ISDN!)

    To place a test call without using pings, use the isdn call interface command.

    R1#isdn call interface bri0 8358662

    R1#

    03:54:43: BR0 DDR: Attempting to dial 8358662

    03:54:43: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up

    03:54:44: BR0:1 DDR: dialer protocol up

    03:54:45: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to up

    03:54:49: %ISDN-6-CONNECT: Interface B

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