Cisco CCNA / CCNP Test Tutorial: Tests ISDN Links Without having Pings
To receive your Cisco CCNA and CCNP certifications, you’ve obtained to learn ISDN – and Inspite https://en.wikipedia.org/wiki/?search=먹튀검증 of what some individuals say, there’s nonetheless plenty of ISDN on the market that should be supported. And With regards to troubleshooting ISDN, there’s a great deal to take a look at. Is the right ISDN switchtype configured? Are definitely the dialer map statements right? How about the dialer-group and dialer-list instructions? And that’s just the beginning.
I usually say that all troubleshooting begins at Layer one, the Physical layer of the OSI product. The same old means of troubleshooting ISDN is sending pings over the link, even so the connection is usually analyzed with out making use of pings or even ahead of assigning IP addresses on the BRI interfaces!
It’s a smart idea to put these check calls before configuring the interfaces – like that, you are aware of you’ve got a legitimate relationship in advance of beginning the configuration (and there’s many config to associate with ISDN!)
To put a examination get in touch with with out using pings, use the isdn simply call interface command.
R1#isdn get in touch with interface bri0 8358662
R1#
03:54:43: BR0 DDR: Attempting to dial 8358662
03:fifty four:43: %LINK-3-UPDOWN: Interface BRI0:one, adjusted state to up
03:fifty four:forty four: BR0:one DDR: dialer protocol up
03:54:forty five: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:one, transformed state to up
03:fifty four:49: %ISDN-six-Join: Interface BRI0:one has become linked to 8358662 R2
To tear the check contact down the right way, use isdn disconnect interface. IOS Help shows the options using this type of command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the information simply call(s) on all b channels
b1 Disconnect the info contact on b1 channel
b2 Disconnect the data 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:two DDR: disconnecting get in touch with
03:58:36: %ISDN-six-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, phone lasted 20 seconds
03:fifty eight:36: %Url-3-UPDOWN: Interface BRI0:1, changed state to down
03:58:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface 토토검증 BRI0:1, transformed point out to down
I say “properly” as the something you don’t wish to do to finish an ISDN connect with, examination or in any other case, is just shut the interface. Telcos don’t like it, and ISDN lab equipment like it even considerably less. Often Allow the d-channel do its do the job and tear the call down within an orderly style – don’t just Lower it off by shutting the interface down.