Cisco CCNA / CCNP Exam Tutorial: Tests ISDN Hyperlinks With no Pings
To make your Cisco CCNA and CCNP certifications, you’ve got to grasp ISDN – and Regardless of what many people say, there’s nonetheless lots of ISDN in existence that needs to be supported. And In regards to troubleshooting ISDN, there’s a great deal to look at. Is the right ISDN switchtype configured? Are definitely the dialer map statements suitable? What about the dialer-group and dialer-listing instructions? And that’s just the start.
I generally say that all troubleshooting begins at Layer one, the Actual physical layer from the OSI model. The same old means of troubleshooting ISDN is sending pings over the hyperlink, but the relationship might be analyzed with out working with pings or even ahead of assigning IP addresses to the BRI interfaces!
It’s a good idea to place these test calls just before configuring the interfaces – like that, you realize you’ve got a valid connection in advance of beginning the configuration (and there’s a lot of config to go along with ISDN!)
To put a exam contact without having employing pings, utilize the isdn call interface command.
R1#isdn call interface bri0 8358662
R1#
03:fifty four:43: BR0 DDR: Attempting to dial 8358662
03:54:forty three: %Website link-3-UPDOWN: Interface BRI0:one, modified 토토검증 condition to up
03:54:44: BR0:1 DDR: dialer protocol up
03:fifty four:forty five: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to up
03:54:forty nine: %ISDN-six-Join: Interface BRI0:one is now linked to 8358662 R2
To tear the check simply call down correctly, use isdn disconnect interface. IOS Aid displays the choices using this type of command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data get in touch with(s) on all b channels
b1 Disconnect the info contact on b1 channel
b2 Disconnect the data call on b2 channel
R1#isdn disconnect interface bri 0 all
03:fifty eight:36: BR0:one DDR: disconnecting get in touch with
03:fifty eight:36: BR0:2 DDR: disconnecting contact
03:fifty eight:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, call lasted 20 seconds
03:fifty eight:36: %Website link-three-UPDOWN: Interface BRI0:1, modified point out to down
03:58:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, adjusted state to down
I say “accurately” as the one thing you don’t want to do to end an ISDN contact, exam or or else, is just shut http://www.bbc.co.uk/search?q=먹튀검증 the interface. Telcos don’t like it, and ISDN lab products like it even much less. Always let the d-channel do its perform and tear the call down in an orderly manner – don’t just Minimize it off by shutting the interface down.