Cisco CCNA / CCNP Examination Tutorial: Testing ISDN Hyperlinks Devoid of Pings
To generate your Cisco CCNA and CCNP certifications, you’ve got to grasp ISDN – and Even with what some individuals say, there’s even now plenty of ISDN in existence that should be supported. And On the subject of troubleshooting ISDN, there’s quite a bit to take a look at. Is the proper ISDN switchtype configured? Are the dialer map statements suitable? What about the dialer-team and dialer-record instructions? And that’s just the start.
I usually say that every one troubleshooting begins at Layer 1, the Physical layer in the OSI design. The usual technique of troubleshooting ISDN is sending pings over the website link, although the relationship can be examined without utilizing pings or even prior to assigning IP addresses to your BRI interfaces!
It’s a good idea to put these exam 토토사이트 phone calls before configuring the interfaces – like that, you recognize you’ve received a legitimate connection ahead of starting the configuration (and there’s a lot of config to associate with ISDN!)
To place a examination connect with without using pings, use the isdn call interface command.
R1#isdn phone interface bri0 8358662
R1#
03:fifty four:43: BR0 DDR: Trying to dial 8358662
03:fifty four:43: %LINK-three-UPDOWN: Interface BRI0:1, altered point out to up
03:fifty four:44: BR0:one DDR: dialer protocol up
03:54:forty five: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, transformed point out to up
03:54:forty nine: %ISDN-six-Join: Interface BRI0:one is currently connected to 8358662 R2
To tear the exam connect with down properly, use isdn disconnect interface. IOS Assist shows the options using this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the information call(s) on all b channels
b1 Disconnect the information get in touch with on b1 channel
b2 Disconnect the data contact on b2 channel
R1#isdn disconnect interface bri 0 all
03:fifty eight:36: BR0:one DDR: disconnecting contact
03:fifty eight:36: BR0:two DDR: disconnecting connect with
03:fifty eight:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, phone lasted 20 seconds
03:fifty eight:36: %Url-3-UPDOWN: Interface BRI0:1, adjusted state to down
03:58:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to down
I say “accurately” https://en.wikipedia.org/wiki/?search=토토사이트 as the one thing you don’t choose to do to end an ISDN phone, check or in any other case, is just shut the interface. Telcos don’t like it, and ISDN lab gadgets like it even fewer. Usually let the d-channel do its function and tear the decision down within an orderly fashion – don’t just cut it off by shutting the interface down.
