Cisco CCNA / CCNP Examination Tutorial: Tests ISDN Links Without Pings
To gain your Cisco CCNA and CCNP certifications, you’ve obtained to master ISDN – and Irrespective of what lots of people say, there’s nonetheless lots of ISDN in existence that needs to be supported. And In relation to troubleshooting ISDN, there’s quite a bit to look at. Is the proper ISDN switchtype configured? Would be the dialer map statements correct? How about the dialer-group and dialer-listing commands? Which’s just the start.
I often say that each one troubleshooting starts off at Layer 1, the Physical layer from the OSI product. The usual way of troubleshooting ISDN is sending pings over the backlink, nevertheless the relationship may be tested with out using pings or simply in advance of assigning IP addresses towards the 먹튀검증 BRI interfaces!
It’s a smart idea to place these test calls ahead of configuring the interfaces – like that, you know you’ve acquired a legitimate relationship in advance of beginning the configuration (and there’s a lot of config to go with ISDN!)
To place a check call devoid of employing pings, utilize the isdn contact interface command.
R1#isdn phone interface bri0 8358662
R1#
03:fifty four:43: BR0 DDR: Seeking to dial 8358662
03:fifty four:43: %LINK-three-UPDOWN: Interface BRI0:one, altered point out to up
03:fifty four:forty four: BR0:1 DDR: dialer protocol up
03:54:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, improved state to up
03:fifty four:forty nine: %ISDN-6-Hook up: Interface BRI0:1 is currently linked to 8358662 R2
To tear the exam connect with down correctly, use isdn disconnect interface. IOS Aid displays the choices with this command.
R1#isdn disconnect interface https://www.washingtonpost.com/newssearch/?query=토토사이트 bri 0 ?
all Disconnect the data call(s) on all b channels
b1 Disconnect the data get in touch with on b1 channel
b2 Disconnect the info contact on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting call
03:fifty eight:36: BR0:2 DDR: disconnecting simply call
03:58:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, call lasted twenty seconds
03:58:36: %Url-three-UPDOWN: Interface BRI0:one, changed condition to down
03:58:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, modified state to down
I say “effectively” since the another thing you don’t need to do to finish an ISDN simply call, test or in any other case, is just shut the interface. Telcos don’t like it, and ISDN lab devices like it even considerably less. Generally let the d-channel do its get the job done and tear the decision down within an orderly vogue – don’t just Slice it off by shutting the interface down.