Cisco CCNA / CCNP Exam Tutorial: Testing ISDN One-way links Devoid of Pings
To receive your Cisco CCNA and CCNP certifications, you’ve bought to grasp ISDN – and despite what some people say, there’s continue to a great deal of ISDN out there that should be supported. And In relation to troubleshooting ISDN, there’s a great deal to take a look at. Is the right ISDN switchtype configured? Are definitely the dialer map statements proper? How about the dialer-group and dialer-listing instructions? Which’s just the start.
I generally say that every one troubleshooting commences at Layer one, the Actual physical layer of the OSI product. The standard way of troubleshooting ISDN is sending pings over the link, however the link might be examined without using pings or perhaps in advance of assigning IP addresses on the BRI interfaces!
It’s a smart idea to position these test phone calls just before configuring the interfaces – this way, you are aware of you’ve received a sound relationship ahead of starting the configuration (and there’s plenty of config to go together with ISDN!)
To position a exam simply call without having making use of pings, utilize the isdn connect with interface command.
R1#isdn phone interface bri0 8358662
R1#
03:fifty four:43: BR0 DDR: Attempting to dial 8358662
03:54:43: %Website link-3-UPDOWN: Interface BRI0:1, improved condition to up
03:fifty four:forty four: BR0:one DDR: dialer protocol up
03:54:forty five: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, improved state to up
03:54:forty nine: %ISDN-six-CONNECT: Interface BRI0:one has become connected to 8358662 R2
To tear the take a look at get in touch with down appropriately, use isdn disconnect interface. IOS Enable shows the choices using this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data simply call(s) on all b channels
b1 Disconnect the data connect with on b1 channel
b2 Disconnect the data phone on b2 channel
R1#isdn disconnect interface bri 0 all
03:fifty eight:36: BR0:1 DDR: disconnecting get in touch with
03:fifty eight:36: BR0:2 DDR: disconnecting get in touch with
03:58:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, call lasted 20 seconds
03:58:36: %Website link-three-UPDOWN: Interface BRI0:1, improved state to down
03:58:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed condition to down
I say “effectively” as the one thing you don’t desire to do to finish an ISDN contact, examination or or else, is simply shut the interface. Telcos don’t http://edition.cnn.com/search/?text=먹튀검증 like it, and ISDN lab products like it even fewer. Usually 토토먹튀 Permit the d-channel do its perform and tear the call down within an orderly manner – don’t just Reduce it off by shutting the interface down.