Cisco CCNA / CCNP Examination Tutorial: Testing ISDN Backlinks Without Pings
To gain your Cisco CCNA and CCNP certifications, you’ve acquired to learn ISDN – and Regardless of what lots of people say, there’s however many ISDN in existence that needs to be supported. And In regards to troubleshooting ISDN, there’s a great deal to have a look at. Is the proper ISDN switchtype configured? Will be the dialer map statements correct? How about the dialer-group and dialer-listing instructions? Which’s just the start.
I often say that each one troubleshooting commences at Layer 1, the Bodily layer with the OSI model. The same old approach to troubleshooting ISDN is sending pings through the website link, however the connection could be examined without http://edition.cnn.com/search/?text=토토사이트 the need of utilizing pings or maybe ahead of assigning IP addresses to the BRI interfaces!
It’s a smart idea to area these check calls in advance of configuring the interfaces – this way, you know you’ve received a legitimate relationship in advance of commencing the configuration (and there’s many config to associate with ISDN!)
To place a test call without the need of employing pings, utilize the isdn phone interface command.
R1#isdn connect 사설사이트 with interface bri0 8358662
R1#
03:54:forty three: BR0 DDR: Seeking to dial 8358662
03:fifty four:forty three: %LINK-three-UPDOWN: Interface BRI0:one, altered point out to up
03:54:forty four: BR0:one DDR: dialer protocol up
03:fifty four:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, adjusted condition to up
03:fifty four:49: %ISDN-six-CONNECT: Interface BRI0:one is currently linked to 8358662 R2
To tear the test get in touch with down the right way, use isdn disconnect interface. IOS Assist displays the choices using this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the info get in touch with(s) on all b channels
b1 Disconnect the information contact on b1 channel
b2 Disconnect the data call on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting simply call
03:fifty eight:36: BR0:two DDR: disconnecting simply call
03:58:36: %ISDN-six-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, call lasted twenty seconds
03:58:36: %Connection-3-UPDOWN: Interface BRI0:one, modified condition to down
03:fifty eight:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to down
I say “appropriately” as the another thing you don’t would like to do to end an ISDN connect with, take a look at or in any other case, is simply shut the interface. Telcos don’t like it, and ISDN lab gadgets like it even considerably less. Constantly Permit the d-channel do its work and tear the decision down in an orderly style – don’t just Slash it off by shutting the interface down.