Cisco CCNA / CCNP Exam Tutorial: Testing ISDN Backlinks Devoid of Pings
To earn your Cisco CCNA and CCNP certifications, you’ve obtained to master ISDN – and Regardless of what lots of people say, there’s continue to a great deal of ISDN in existence that needs to be supported. And With regards to troubleshooting ISDN, there’s a good deal to take a look at. Is the right ISDN switchtype configured? Are definitely the dialer map statements right? How about the dialer-team and dialer-record commands? And that’s just the start.
I often say that every one troubleshooting starts at Layer 1, the Actual physical layer with the OSI product. The usual way of troubleshooting ISDN is sending pings over the link, although the connection is usually examined without employing pings as well as right before assigning IP addresses for the BRI interfaces!
It’s a smart idea to put these check calls right before configuring the interfaces – this way, you realize you’ve got a valid connection just before commencing the configuration (and there’s a lot of config to associate with ISDN!)
To position a take a look at call without the need of using pings, use the isdn simply call interface command.
R1#isdn connect with interface bri0 8358662
R1#
03:fifty four:forty three: BR0 DDR: Aiming https://en.wikipedia.org/wiki/?search=먹튀검증 to dial 8358662
03:fifty four:forty three: %LINK-three-UPDOWN: Interface BRI0:1, altered state to up
03:54:forty four: BR0:1 DDR: dialer protocol up
03:54:forty five: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, improved condition to up
03:fifty four:forty nine: %ISDN-6-CONNECT: Interface BRI0:1 is currently connected to 8358662 R2
To tear the check simply call down correctly, use isdn disconnect interface. IOS Support displays the choices using this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data connect with(s) on all b channels
b1 Disconnect the information phone on b1 channel
b2 Disconnect the data get in touch with on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:1 DDR: disconnecting phone
03:fifty eight:36: BR0:2 DDR: disconnecting phone
03:58:36: %ISDN-6-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, call lasted 20 seconds
03:58:36: %Hyperlink-three-UPDOWN: Interface BRI0:1, improved point out to down
03:fifty eight:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed point out to down
I say “correctly” since the another thing 먹튀검증업체 you don’t would like to do to finish an ISDN contact, test or in any other case, is just shut the interface. Telcos don’t like it, and ISDN lab units like it even much less. Often let the d-channel do its function and tear the call down in an orderly manner – don’t just Minimize it off by shutting the interface down.