Cisco CCNA / CCNP Test Tutorial: Screening ISDN One-way links Without having Pings
To gain your Cisco CCNA and CCNP certifications, you’ve received to grasp ISDN – and despite what many people say, there’s even now a lot of ISDN around that should be supported. And In terms of troubleshooting ISDN, there’s a lot to take a look at. Is the proper ISDN switchtype configured? Will be the dialer map statements correct? How about the dialer-team and dialer-record instructions? Which’s just the start.
I generally say that all troubleshooting starts 안전놀이터 off at Layer one, the Actual physical layer in the OSI model. The standard way of troubleshooting ISDN is sending pings through the link, though the link may be analyzed without the need of using pings or simply right before assigning IP addresses for the BRI interfaces!
It’s a good idea to place these exam calls ahead of configuring the interfaces – that way, you understand you’ve bought a legitimate connection right before commencing the configuration (and there’s loads of config to go along with ISDN!)
To position a test phone without having making use of pings, use the isdn connect with interface command.
R1#isdn connect with interface bri0 8358662
R1#
03:54:forty three: BR0 DDR: Seeking to dial 8358662
03:fifty four:43: %Hyperlink-3-UPDOWN: Interface BRI0:one, transformed http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/먹튀검증 point out to up
03:fifty four:forty four: BR0:one DDR: dialer protocol up
03:fifty four:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, adjusted state to up
03:54:49: %ISDN-6-Join: Interface BRI0:1 has become connected to 8358662 R2
To tear the check simply call down properly, use isdn disconnect interface. IOS Support shows the choices with this particular command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data simply call(s) on all b channels
b1 Disconnect the information call on b1 channel
b2 Disconnect the info simply call on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting phone
03:fifty eight:36: BR0:two DDR: disconnecting simply call
03:58:36: %ISDN-6-DISCONNECT: Interface BRI0:1 disconnected from 8358662
R2, call lasted twenty seconds
03:58:36: %Url-three-UPDOWN: Interface BRI0:one, adjusted point out to down
03:fifty eight:37: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, improved point out to down
I say “appropriately” since the another thing you don’t need to do to end an ISDN call, examination or if not, is simply shut the interface. Telcos don’t like it, and ISDN lab products like it even much less. Always Enable the d-channel do its perform and tear the decision down in an orderly manner – don’t just Minimize it off by shutting the interface down.