Cisco CCNA / CCNP Examination Tutorial: Screening ISDN Backlinks Devoid of Pings
To get paid your Cisco CCNA and CCNP certifications, you’ve obtained to grasp ISDN – and Irrespective of what a lot of people say, there’s even now many ISDN in existence that should be supported. And With regards to troubleshooting ISDN, there’s a good deal to look at. Is the right ISDN switchtype configured? Tend to be the dialer map statements suitable? What about the dialer-team and dialer-record instructions? Which’s just the beginning.
I usually say that each one troubleshooting begins at Layer one, the Physical layer of the OSI model. The usual approach to troubleshooting ISDN is sending pings across the website link, nevertheless the connection could be analyzed with no utilizing pings as well as before assigning IP addresses towards the BRI interfaces!
It’s a good idea to area these check phone calls ahead of configuring the interfaces – like that, you understand you’ve received a sound relationship ahead of commencing the configuration (and there’s many config to go along with ISDN!)
To put a check contact with out employing pings, make use of the isdn phone interface command.
R1#isdn simply call interface bri0 8358662
R1#
03:fifty four:43: BR0 DDR: Attempting to dial 8358662
03:fifty four:43: %Website link-three-UPDOWN: Interface BRI0:one, modified state to up
03:fifty four:44: BR0:one DDR: dialer protocol up
03:fifty four:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, improved point out to up
03:fifty four:49: %ISDN-six-Link: Interface BRI0:one has become linked to 8358662 R2
To tear the take a look at phone down appropriately, use isdn disconnect interface. IOS Help displays the choices using this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the information 안전놀이터 connect with(s) on all b channels
b1 Disconnect the data contact on b1 channel
b2 Disconnect the info call on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting contact
03:58:36: BR0:2 DDR: disconnecting call
03:58:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, get in touch with lasted 20 seconds
03:58:36: %Url-three-UPDOWN: Interface BRI0:one, altered point out to down
03:fifty eight:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, modified condition to down
I say “properly” because the one thing you don’t want to do to finish an ISDN simply call, test or if not, is http://www.bbc.co.uk/search?q=먹튀검증 simply shut the interface. Telcos don’t like it, and ISDN lab units like it even much less. Generally Permit the d-channel do its perform and tear the call down in an orderly manner – don’t just Lower it off by shutting the interface down.