Cisco CCNA / CCNP Examination Tutorial: Tests ISDN Backlinks Without the need of Pings
To generate your Cisco CCNA and CCNP certifications, you’ve received to master ISDN – and Irrespective of what some people say, there’s nevertheless many ISDN available that needs to be supported. And With regards to troubleshooting ISDN, there’s lots to look at. Is the proper ISDN switchtype configured? Are definitely the dialer map statements appropriate? What about the dialer-team and dialer-listing instructions? Which’s just the start.
I generally say that every one troubleshooting starts at Layer one, the Actual physical layer on the OSI design. The usual means of troubleshooting ISDN is sending pings through the backlink, even so the link might be tested without having working with pings and even just before assigning IP addresses for the BRI interfaces!
It’s a good idea to location these test phone calls just before configuring the interfaces – like that, you realize you’ve received a sound link before beginning the configuration (and there’s loads of config to associate with ISDN!)
To put a check call without utilizing pings, utilize the isdn get in touch with interface command.
R1#isdn contact interface bri0 8358662
R1#
03:fifty four:43: BR0 DDR: Attempting to dial 8358662
03:54:43: %Hyperlink-3-UPDOWN: Interface BRI0:one, changed state to up
03:54:44: BR0:one DDR: dialer protocol up
03:fifty four:forty five: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, changed condition to up
03:54:49: %ISDN-6-Hook up: Interface BRI0:one has become connected to 8358662 R2
To tear the exam connect with down properly, use isdn disconnect interface. IOS Enable displays the options with this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data phone(s) on all b channels
b1 Disconnect the info contact on b1 channel
b2 Disconnect the data contact on b2 channel
R1#isdn disconnect interface bri 0 all
03:fifty eight:36: BR0:1 DDR: disconnecting simply call
03:fifty eight:36: BR0:2 DDR: disconnecting phone
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: %Hyperlink-three-UPDOWN: Interface BRI0:1, improved point out to down
03:fifty eight:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, altered state to down
I say “properly” as the one thing you don’t choose to do to finish an ISDN call, take a look at or otherwise, is just shut the interface. Telcos don’t like it, and ISDN lab gadgets like it even much less. http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/먹튀검증 Generally Allow the d-channel do its do the job and tear the call down in 먹튀검증업체 an orderly trend – don’t just cut it off by shutting the interface down.