Cisco CCNA / CCNP Test Tutorial: Tests ISDN Hyperlinks With no Pings
To earn your Cisco CCNA and CCNP certifications, you’ve obtained to learn ISDN – and Regardless of what many people say, there’s even now a great deal of ISDN around that should be supported. And when it 토토사이트 comes to troubleshooting ISDN, there’s a great deal to look at. Is the right ISDN switchtype configured? Would be the dialer map statements accurate? How about the dialer-group and dialer-checklist commands? And that’s just the beginning.
I usually say that all troubleshooting starts at Layer one, the Actual physical layer of the OSI model. The usual method of troubleshooting ISDN is sending pings throughout the hyperlink, nevertheless the link may be examined without making use of pings or maybe in advance of assigning IP addresses to the BRI interfaces!
It’s a smart idea to location these take a look at calls ahead of configuring the interfaces – this way, you know you’ve obtained a legitimate connection just before http://edition.cnn.com/search/?text=먹튀검증 starting the configuration (and there’s a lot of config to go with ISDN!)
To position a examination simply call with no employing pings, make use of the isdn phone interface command.
R1#isdn get in touch with interface bri0 8358662
R1#
03:54:forty three: BR0 DDR: Seeking to dial 8358662
03:fifty four:43: %LINK-3-UPDOWN: Interface BRI0:1, improved point out to up
03:fifty four:44: BR0:1 DDR: dialer protocol up
03:fifty four:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, changed point out to up
03:54:forty nine: %ISDN-6-Join: Interface BRI0:one is currently linked to 8358662 R2
To tear the check connect with down appropriately, use isdn disconnect interface. IOS Enable displays the options with this particular command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the information connect with(s) on all b channels
b1 Disconnect the info get in touch with on b1 channel
b2 Disconnect the data connect with on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:1 DDR: disconnecting call
03:58:36: BR0:two DDR: disconnecting connect with
03:fifty eight:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, call lasted twenty seconds
03:fifty eight:36: %Website link-three-UPDOWN: Interface BRI0:1, improved state to down
03:fifty eight:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, modified condition to down
I say “appropriately” because the one thing you don’t desire to do to end an ISDN simply call, take a look at or if not, is simply shut the interface. Telcos don’t like it, and ISDN lab units like it even fewer. Usually Enable the d-channel do its do the job and tear the call down within an orderly fashion – don’t just Slash it off by shutting the interface down.