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Cisco CCNA / CCNP Exam Tutorial: Screening ISDN One-way links Without having Pings

To receive your Cisco CCNA and CCNP certifications, you’ve obtained to master ISDN – and Inspite of what some people say, there’s continue to plenty of ISDN to choose from that should be supported. And In terms of troubleshooting ISDN, there’s a whole lot to look at. Is the proper ISDN switchtype configured? Are definitely the dialer map statements accurate? How about the dialer-group and dialer-checklist instructions? And that’s just the start.

I generally say that every one troubleshooting starts off at Layer one, the Actual physical layer on the OSI model. The usual means of troubleshooting ISDN is sending pings through the link, but the link may be tested with out making use of pings or perhaps just before assigning IP addresses for the BRI interfaces!

It’s a good idea to spot these exam calls right before configuring the interfaces – this way, you recognize you’ve received a legitimate connection in advance of commencing the configuration (and there’s a great deal of config to go together with ISDN!)

To position a exam get in touch with without having making use of pings, make use of the isdn contact interface command.

R1#isdn simply call interface bri0 8358662

R1#

03:fifty four:43: BR0 DDR: Trying to dial 8358662

03:fifty four:43: %Backlink-three-UPDOWN: Interface BRI0:one, improved 먹튀검증 point out to up

03:54:forty four: BR0:one DDR: dialer protocol up

03:54:forty five: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, adjusted state http://www.thefreedictionary.com/먹튀검증 to up

03:fifty four:forty nine: %ISDN-6-CONNECT: Interface BRI0:1 is currently connected to 8358662 R2

To tear the examination get in touch with down the right way, use isdn disconnect interface. IOS Help shows the options with this particular command.

R1#isdn disconnect interface bri 0 ?

all Disconnect the information get in touch with(s) on all b channels

b1 Disconnect the information call on b1 channel

b2 Disconnect the data simply call on b2 channel

image

R1#isdn disconnect interface bri 0 all

03:fifty eight:36: BR0:one DDR: disconnecting connect with

03:58:36: BR0:two DDR: disconnecting contact

03:fifty eight:36: %ISDN-6-DISCONNECT: Interface BRI0:1 disconnected from 8358662

R2, connect with lasted twenty seconds

03:fifty eight:36: %Url-3-UPDOWN: Interface BRI0:1, changed condition to down

03:58:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, changed state to down

I say “properly” since the another thing you don’t want to do to end an ISDN phone, examination or if not, is simply shut the interface. Telcos don’t like it, and ISDN lab units like it even significantly less. Always let the d-channel do its work and tear the decision down in an orderly style – don’t just Reduce it off by shutting the interface down.