Cisco CCNA / CCNP Test Tutorial: Screening ISDN Links Without the need of Pings
To make your Cisco CCNA and CCNP certifications, you’ve bought to learn ISDN – and despite what lots of people say, there’s nonetheless lots of ISDN in existence that needs to be supported. And With regards to troubleshooting ISDN, there’s a great deal to take a look at. Is the proper ISDN switchtype configured? Are the dialer map statements accurate? How about the dialer-group and dialer-record commands? Which’s just the start.
I constantly say that all troubleshooting starts off at Layer 1, the Actual physical layer of the OSI model. The same old approach to troubleshooting ISDN is sending pings over the backlink, nevertheless the link is often tested devoid of making use of pings and even just before assigning IP addresses on the BRI interfaces!
It’s a good idea to position these exam phone calls right before configuring the interfaces – like that, you realize you’ve received a valid link in advance of beginning the configuration (and there’s lots of config to go together with ISDN!)
To position a take a look at connect with without the need of using pings, use the isdn call interface command.
R1#isdn call interface bri0 8358662
R1#
03:fifty four:forty three: BR0 DDR: Aiming to dial 8358662
03:54:forty three: %Hyperlink-three-UPDOWN: Interface BRI0:one, changed condition to up
03:fifty four:44: BR0:1 DDR: dialer protocol up
03:fifty four:45: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, altered point out to up
03:fifty four:forty nine: %ISDN-six-Join: Interface BRI0:1 is now linked to 8358662 R2
To tear the test get in touch with down effectively, use isdn disconnect interface. IOS Aid displays the options using this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data simply call(s) on all b channels
b1 Disconnect the data get in touch with on b1 channel
b2 Disconnect the info call on b2 channel
R1#isdn disconnect interface bri 0 all
03:fifty eight:36: BR0:one DDR: disconnecting contact
03:fifty eight:36: BR0:2 DDR: disconnecting get in touch with
03:58:36: %ISDN-6-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, contact lasted twenty seconds
03:58:36: 먹튀검증 %Connection-3-UPDOWN: Interface BRI0:1, altered state to down
03:fifty eight:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:one, transformed state to down
I say “appropriately” because the something you don’t wish to do to finish an ISDN https://www.washingtonpost.com/newssearch/?query=먹튀검증 phone, test or otherwise, is just shut the interface. Telcos don’t like it, and ISDN lab products like it even a lot less. Always Enable the d-channel do its function and tear the decision down in an orderly vogue – don’t just Slash it off by shutting the interface down.