Cisco CCNA / CCNP Exam Tutorial: Screening ISDN Backlinks Without having Pings
To make your Cisco CCNA and CCNP certifications, you’ve got to master ISDN – and despite what some individuals say, there’s nonetheless a great deal of ISDN out there that should be supported. And With regards to troubleshooting ISDN, there’s lots to take a look at. Is the correct ISDN switchtype configured? Tend to be the dialer map statements appropriate? What about the dialer-team and dialer-list commands? Which’s just the start.
I normally say http://www.bbc.co.uk/search?q=먹튀검증 that each one troubleshooting starts off at Layer one, the Physical layer of the OSI design. The same old method of troubleshooting ISDN is sending pings over the website link, although the link could be analyzed without the need of employing pings or even in advance of assigning IP addresses towards the BRI interfaces!
It’s a smart idea to position these test calls prior to configuring the interfaces – this way, you recognize you’ve got a sound relationship right before beginning the configuration (and there’s a great deal of config to go along with ISDN!)
To place a examination call with out utilizing pings, use the isdn contact interface command.
R1#isdn get in touch with interface bri0 8358662
R1#
03:fifty four:forty three: BR0 DDR: Trying to dial 8358662
03:fifty four:43: %Website link-3-UPDOWN: Interface BRI0:1, changed state to up
03:54:forty four: BR0:one DDR: dialer protocol up
03:54:forty five: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:one, modified condition to up
03:54:forty nine: %ISDN-6-Hook up: Interface BRI0:1 is now connected to 8358662 R2
To tear the check get in touch with down effectively, use isdn disconnect interface. IOS Assist shows the choices with this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data contact(s) on all b channels
b1 Disconnect the information call on b1 channel
b2 Disconnect the information get in touch with on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting get in touch with
03:fifty eight:36: BR0:two DDR: disconnecting connect with
03:fifty eight:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, connect with lasted twenty seconds
03:fifty 먹튀검증업체 eight:36: %Backlink-three-UPDOWN: Interface BRI0:one, modified state to down
03:fifty eight:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to down
I say “correctly” since the another thing you don’t need to do to finish an ISDN get in touch with, examination or otherwise, is just shut the interface. Telcos don’t like it, and ISDN lab units like it even less. Normally Allow the d-channel do its do the job and tear the call down within an orderly fashion – don’t just cut it off by shutting the interface down.