Cisco CCNA / CCNP Test Tutorial: Screening ISDN Inbound links With no Pings
To make your Cisco CCNA and CCNP certifications, you’ve bought to grasp ISDN – and Regardless of what some people say, there’s still a great deal of ISDN on the market that should be supported. And In regards to troubleshooting ISDN, there’s a good deal to look at. Is the right ISDN switchtype configured? Will be the dialer map statements correct? How about the dialer-team and dialer-record instructions? And that’s just the start.
I often say that all troubleshooting commences at Layer one, the Physical layer with the OSI product. The usual way of troubleshooting ISDN is sending pings over the link, nevertheless the relationship is usually analyzed without making use of pings as well as ahead of assigning IP addresses for the BRI interfaces!
It’s a good idea to location these take a look at calls ahead of configuring the interfaces – this way, you know you’ve got a valid relationship right before starting the configuration (and there’s a http://edition.cnn.com/search/?text=먹튀검증 great deal of config to go together with ISDN!)
To position a exam simply call with out applying pings, make use of the isdn phone interface command.
R1#isdn contact interface bri0 8358662
R1#
03:54:43: BR0 DDR: Aiming to dial 8358662
03:fifty four:forty three: %Url-3-UPDOWN: Interface BRI0:1, modified state 안전놀이터 to up
03:54:forty four: BR0:1 DDR: dialer protocol up
03:54:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, modified condition to up
03:fifty four:forty nine: %ISDN-six-Hook up: Interface BRI0:1 has become connected to 8358662 R2
To tear the test call down appropriately, use isdn disconnect interface. IOS Help shows the options using this type of command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the info connect with(s) on all b channels
b1 Disconnect the information phone on b1 channel
b2 Disconnect the info call on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting simply call
03:58:36: BR0:two DDR: disconnecting contact
03:fifty eight:36: %ISDN-6-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, phone lasted 20 seconds
03:58:36: %Website link-three-UPDOWN: Interface BRI0:one, altered condition to down
03:fifty eight:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, altered condition to down
I say “correctly” because the something you don’t desire to do to end an ISDN connect with, test or or else, is simply shut the interface. Telcos don’t like it, and ISDN lab devices like it even considerably less. Often let the d-channel do its do the job and tear the call down in an orderly fashion – don’t just Reduce it off by shutting the interface down.