Cisco CCNA / CCNP Exam Tutorial: Screening ISDN Back links Without Pings
To earn your Cisco CCNA and CCNP certifications, you’ve got to learn ISDN – and In spite of what lots of people say, there’s nonetheless a lot of ISDN in existence that should be supported. And With regards to troubleshooting ISDN, there’s quite a bit to have a look at. Is the http://www.thefreedictionary.com/먹튀검증 proper ISDN switchtype configured? Are definitely the dialer map statements suitable? How about the dialer-team and dialer-list commands? And that’s just the start.
I constantly say that each one troubleshooting starts at Layer 1, the Bodily layer on the OSI product. The same old technique of troubleshooting ISDN is sending pings throughout the backlink, although the relationship can be examined with out using pings and even before assigning IP addresses to the BRI interfaces!
It’s a good idea to spot these examination calls ahead of configuring the interfaces – this way, you recognize you’ve got a valid relationship right before 토토검증 beginning the configuration (and there’s a great deal of config to associate with ISDN!)
To put a examination phone with out making use of pings, make use of the isdn contact interface command.
R1#isdn connect with interface bri0 8358662
R1#
03:54:forty three: BR0 DDR: Attempting to dial 8358662
03:54:forty three: %Connection-3-UPDOWN: Interface BRI0:1, modified point out to up
03:54:forty four: BR0:1 DDR: dialer protocol up
03:54:45: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:one, transformed state to up
03:fifty four:forty nine: %ISDN-six-Link: Interface BRI0:one is now connected to 8358662 R2
To tear the examination contact down effectively, use isdn disconnect interface. IOS Assistance shows the choices using this type of command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data contact(s) on all b channels
b1 Disconnect the info call on b1 channel
b2 Disconnect the information call on b2 channel
R1#isdn disconnect interface bri 0 all
03:fifty eight:36: BR0:one DDR: disconnecting connect with
03:58:36: BR0:2 DDR: disconnecting connect with
03:fifty eight:36: %ISDN-six-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, get in touch with lasted twenty seconds
03:fifty eight:36: %Connection-3-UPDOWN: Interface BRI0:one, modified state to down
03:58:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, adjusted condition to down
I say “correctly” since the something you don’t would like to do to finish an ISDN call, take a look at or if not, is just shut the interface. Telcos don’t like it, and ISDN lab equipment like it even less. Often Permit the d-channel do its get the job done and tear the decision down within an orderly style – don’t just Minimize it off by shutting the interface down.