Cisco CCNA / CCNP Examination Tutorial: Testing ISDN Backlinks Without Pings
To generate your Cisco CCNA and CCNP certifications, you’ve bought to grasp ISDN – and In spite of what some individuals say, there’s continue to lots of ISDN out there that should be supported. And In terms of troubleshooting ISDN, there’s lots to take a look at. Is the proper ISDN switchtype configured? Are definitely the dialer map statements right? How about the dialer-team and dialer-list commands? Which’s just the beginning.
I generally say that each one troubleshooting starts at Layer one, the Actual physical layer of the OSI product. The usual technique of troubleshooting ISDN is sending pings across the website link, however the connection is often examined with no utilizing pings and even prior to assigning IP addresses on the BRI interfaces!
It’s a good idea to area these examination phone calls right before configuring the interfaces – this way, you are aware of you’ve got a valid connection prior to commencing the configuration (and there’s many config to go together with ISDN!)
To put a take 먹튀사이트 a look at phone with no making use of pings, utilize the isdn get in touch with interface command.
R1#isdn simply call interface bri0 8358662
R1#
03:54:43: BR0 DDR: Aiming to dial 8358662
03:54:forty three: %Hyperlink-three-UPDOWN: Interface BRI0:one, modified condition to up
03:54:44: BR0:one DDR: dialer protocol up
03:54:forty five: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to up
03:fifty four:49: %ISDN-six-Join: Interface BRI0:one is currently linked to 8358662 R2
To tear the test call down correctly, use isdn disconnect interface. IOS Support displays the choices with this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the information phone(s) on all b channels
b1 Disconnect the http://www.bbc.co.uk/search?q=먹튀검증 data contact on b1 channel
b2 Disconnect the info connect with on b2 channel
R1#isdn disconnect interface bri 0 all
03:fifty eight:36: BR0:1 DDR: disconnecting call
03:fifty eight:36: BR0:two DDR: disconnecting phone
03:fifty eight:36: %ISDN-six-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, simply call lasted 20 seconds
03:fifty eight:36: %Hyperlink-3-UPDOWN: Interface BRI0:one, transformed state to down
03:58:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, changed point out to down
I say “accurately” as the another thing you don’t need to do to finish an ISDN connect with, test or normally, is simply shut the interface. Telcos don’t like it, and ISDN lab products like it even significantly less. Always Permit the d-channel do its perform and tear the call down within an orderly fashion – don’t just cut it off by shutting the interface down.