Cisco CCNA / CCNP Examination Tutorial: Testing ISDN Backlinks Without having Pings
To get paid your Cisco CCNA and CCNP certifications, you’ve got to grasp ISDN – and Regardless of what lots of people say, there’s continue to plenty of ISDN around that should be supported. And In terms of troubleshooting ISDN, there’s a whole lot to take a look at. Is the right ISDN switchtype configured? Are the dialer map statements appropriate? What about the dialer-team and dialer-listing instructions? Which’s just the beginning.
I always say that each one troubleshooting starts at Layer one, the Actual physical layer from the OSI model. The standard way of troubleshooting ISDN is sending pings across the link, but the relationship could be tested without the need of applying pings or even prior to assigning IP addresses to your BRI interfaces!
It’s a good idea to put these examination phone calls right before configuring the interfaces – like that, you understand you’ve got a legitimate relationship in advance of starting the configuration (and there’s a great deal of config to go with ISDN!)
To position a examination get in touch with with no using pings, http://www.thefreedictionary.com/토토사이트 utilize the isdn contact interface command.
R1#isdn call interface bri0 8358662
R1#
03:54:43: BR0 DDR: Trying to dial 8358662
03:fifty four:forty three: %Url-3-UPDOWN: Interface BRI0:1, changed condition to up
03:54:44: BR0:one DDR: dialer protocol up
03:54:45: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:one, modified point out to up
03:54:forty nine: %ISDN-six-Link: Interface BRI0:one is currently connected to 8358662 R2
To tear the examination phone down accurately, use isdn disconnect interface. IOS Aid displays the options using this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the info connect with(s) 메이저사이트 on all b channels
b1 Disconnect the data contact on b1 channel
b2 Disconnect the information 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 call
03:fifty eight:36: %ISDN-6-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, phone lasted twenty seconds
03:fifty eight:36: %Backlink-3-UPDOWN: Interface BRI0:1, changed condition to down
03:58:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, modified point out to down
I say “effectively” since the another thing you don’t wish to do to end an ISDN phone, examination or or else, is simply shut the interface. Telcos don’t like it, and ISDN lab gadgets like it even significantly less. Usually Enable the d-channel do its function and tear the decision down within an orderly manner – don’t just Lower it off by shutting the interface down.