Cisco CCNA / CCNP Exam Tutorial: Screening ISDN Backlinks Without having Pings
To gain your Cisco CCNA and CCNP certifications, you’ve acquired to grasp ISDN – and Irrespective of what a number of people say, there’s however loads of ISDN available that needs to be supported. And In regards to troubleshooting ISDN, there’s a whole lot to look at. Is the proper ISDN switchtype configured? Are definitely http://edition.cnn.com/search/?text=먹튀검증 the dialer map statements appropriate? How about the dialer-team and dialer-checklist instructions? Which’s just the beginning.
I generally say that each one troubleshooting starts off at Layer 1, the Actual physical layer with the OSI design. The standard approach to troubleshooting ISDN is sending pings throughout the backlink, though the connection is usually examined devoid of employing pings or simply before assigning IP addresses for the BRI interfaces!
It’s a good idea to place these test calls right before configuring the interfaces – this way, you realize you’ve obtained a legitimate link ahead of commencing the configuration (and there’s a great deal of config to associate with ISDN!)
To place a test get in touch with without having working with pings, utilize the isdn phone interface command.
R1#isdn simply call interface bri0 8358662
R1#
03:54:43: BR0 DDR: Seeking to dial 8358662
03:54:43: %LINK-three-UPDOWN: Interface BRI0:one, altered condition to up
03:54:44: BR0:1 DDR: dialer protocol up
03:fifty four:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, improved condition to up
03:fifty four:49: %ISDN-six-Join: Interface BRI0:one is currently linked to 8358662 R2
To tear the exam get in touch with down appropriately, use isdn disconnect interface. IOS Assist displays the options using this type of command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the information connect with(s) on all b channels
b1 Disconnect the info phone on b1 channel
b2 Disconnect the info phone on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting get in touch with
03:58:36: BR0:2 DDR: disconnecting get in touch with
03:58:36: %ISDN-6-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, connect with lasted twenty seconds
03:58:36: %Connection-3-UPDOWN: Interface BRI0:one, transformed condition to down
03:fifty eight:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, adjusted state to down
I say “properly” since the another thing you don’t wish to do to end an ISDN get in touch with, exam or usually, is simply shut the interface. Telcos don’t like it, and ISDN 토토먹튀 lab equipment like it even significantly less. Usually let the d-channel do its get the job done and tear the decision down in an orderly vogue – don’t just Lower it off by shutting the interface down.