Cisco CCNA / CCNP Examination Tutorial: Screening ISDN One-way links Without Pings
To make your Cisco CCNA and CCNP certifications, you’ve obtained to learn ISDN – and In spite of what a lot of people say, there’s nevertheless lots of ISDN http://www.thefreedictionary.com/먹튀검증 on the market that should be supported. And On the subject of troubleshooting ISDN, there’s a good deal to take a look at. Is the proper ISDN switchtype configured? Would be the dialer map statements proper? How about the dialer-group and dialer-listing commands? Which’s just the start.
I always say that each one troubleshooting starts off at Layer one, the Bodily layer from the OSI product. The same old method of troubleshooting ISDN is sending pings across the backlink, although the connection might be analyzed without having utilizing pings as well as just before assigning IP addresses on the BRI interfaces!
It’s a good idea to place these check phone calls just before configuring the interfaces – this way, you already know you’ve got a sound link in advance of beginning the configuration (and there’s loads of config to go with ISDN!)
To place a test call devoid of utilizing pings, use the isdn get in touch with interface command.
R1#isdn get in touch with interface bri0 8358662
R1#
03:fifty four:forty three: BR0 DDR: Seeking to dial 8358662
03:fifty four:43: %Backlink-three-UPDOWN: Interface BRI0:1, improved state to up
03:fifty four:44: BR0:one DDR: dialer protocol up
03:54:45: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, improved condition to up
03:fifty four:forty nine: %ISDN-six-Hook up: Interface BRI0:one has become connected to 8358662 R2
To tear the check phone down appropriately, use isdn disconnect interface. IOS Aid displays the options with this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the info contact(s) on all b channels
b1 Disconnect the information connect with on b1 channel
b2 Disconnect the info contact on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:1 DDR: disconnecting connect with
03:58:36: BR0:two DDR: disconnecting contact
03:fifty eight:36: %ISDN-6-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, connect with lasted twenty seconds
03:fifty eight:36: %Hyperlink-three-UPDOWN: Interface BRI0:one, transformed state to down
03:58:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:one, changed state to down
I say “correctly” as the something you don’t would like to do to finish an ISDN call, exam or if not, is simply shut the 토토먹튀 interface. Telcos don’t like it, and ISDN lab units like it even much less. Constantly let the d-channel do its operate and tear the call down in an orderly manner – don’t just Reduce it off by shutting the interface down.