Cisco CCNA / CCNP Exam Tutorial: Tests ISDN Inbound links Without the need of Pings
To get paid your Cisco CCNA and CCNP certifications, you’ve bought to learn ISDN – and despite what some people say, there’s nevertheless plenty of ISDN available that needs to be supported. And On the subject of troubleshooting ISDN, there’s http://edition.cnn.com/search/?text=토토사이트 quite a bit to 안전공원 look at. Is the right ISDN switchtype configured? Are classified as the dialer map statements suitable? How about the dialer-group and dialer-record instructions? Which’s just the start.
I usually say that each one troubleshooting starts at Layer 1, the Actual physical layer on the OSI design. The same old means of troubleshooting ISDN is sending pings throughout the hyperlink, however the link could be tested with out using pings or even before assigning IP addresses to the BRI interfaces!
It’s a smart idea to spot these examination phone calls right before configuring the interfaces – that way, you know you’ve got a valid connection ahead of beginning the configuration (and there’s many config to associate with ISDN!)
To put a check phone with no utilizing pings, utilize the isdn call interface command.
R1#isdn contact interface bri0 8358662
R1#
03:fifty four:forty three: BR0 DDR: Trying to dial 8358662
03:fifty four:forty three: %Hyperlink-three-UPDOWN: Interface BRI0:one, altered point out to up
03:fifty four:forty four: BR0:one DDR: dialer protocol up
03:fifty four:forty five: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, adjusted condition to up
03:54:forty nine: %ISDN-6-Join: Interface BRI0:one is currently linked to 8358662 R2
To tear the exam connect with down accurately, use isdn disconnect interface. IOS Aid shows the options with this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the information phone(s) on all b channels
b1 Disconnect the data call on b1 channel
b2 Disconnect the data get in touch with on b2 channel
R1#isdn disconnect interface bri 0 all
03:fifty eight:36: BR0:1 DDR: disconnecting phone
03:fifty eight:36: BR0:two DDR: disconnecting simply call
03:fifty eight:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, get in touch with lasted 20 seconds
03:58:36: %Url-3-UPDOWN: Interface BRI0:one, transformed state to down
03:fifty eight:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, changed condition to down
I say “effectively” because the another thing you don’t would like to do to end an ISDN simply call, check or in any other case, is simply shut the interface. Telcos don’t like it, and ISDN lab units like it even significantly less. Often Permit the d-channel do its work and tear the call down within an orderly manner – don’t just Reduce it off by shutting the interface down.