Cisco CCNA / CCNP Examination Tutorial: Testing ISDN Hyperlinks Without Pings
To get paid your Cisco CCNA and CCNP certifications, you’ve received to grasp ISDN – and Regardless of what some individuals say, there’s continue to a great deal of ISDN on the market that should be supported. And In regards to troubleshooting ISDN, there’s a whole lot to have a look at. Is the right ISDN switchtype configured? Are the dialer map statements right? How about the dialer-group and dialer-listing instructions? And that’s just the start.
I constantly say that each one troubleshooting starts off at Layer 1, the Physical layer of the OSI design. The usual means of troubleshooting ISDN is sending pings through the link, but the connection is usually examined without applying pings and even in advance of assigning IP addresses on the BRI interfaces!
It’s a good idea to location these check phone calls before configuring the interfaces – like that, you realize you’ve received a legitimate relationship in advance of starting the configuration (and there’s many config to associate with ISDN!)
To put a exam phone without the need of using pings, utilize the isdn call interface command.
R1#isdn call interface bri0 8358662
R1#
03:fifty four:forty three: BR0 DDR: Trying to dial 8358662
03:fifty four:43: %Hyperlink-three-UPDOWN: Interface BRI0:1, altered condition to up
03:fifty four:forty four: BR0:1 DDR: dialer protocol up
03:54:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, adjusted point out to up
03:54:forty nine: %ISDN-six-CONNECT: Interface BRI0:1 is now linked to 8358662 R2
To tear the examination simply call down accurately, use isdn disconnect interface. IOS Help displays the choices with this particular command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data contact(s) on all b channels
b1 Disconnect the 토토먹튀 information phone on b1 channel
b2 Disconnect the data call on b2 channel
R1#isdn disconnect interface bri 0 http://www.bbc.co.uk/search?q=먹튀검증 all
03:58:36: BR0:one DDR: disconnecting connect with
03:58:36: BR0:2 DDR: disconnecting simply call
03:fifty eight:36: %ISDN-six-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, phone lasted twenty seconds
03:fifty eight:36: %Website link-3-UPDOWN: Interface BRI0:1, altered point out to down
03:fifty eight:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, improved point out to down
I say “the right way” as the one thing you don’t want to do to finish an ISDN get in touch with, exam or otherwise, is simply shut the interface. Telcos don’t like it, and ISDN lab gadgets like it even less. Constantly Permit the d-channel do its perform and tear the decision down in an orderly manner – don’t just Slice it off by shutting the interface down.