Cisco CCNA / CCNP Test Tutorial: Screening ISDN Links Without Pings
To make your Cisco CCNA and CCNP certifications, you’ve bought to learn ISDN – and 안전놀이터 Regardless of what a lot of people say, there’s nevertheless loads of ISDN on the market that needs to be supported. And On the subject of troubleshooting ISDN, there’s a great deal to have a look at. Is the correct ISDN switchtype configured? Are the dialer map statements accurate? How about the dialer-group and dialer-checklist commands? Which’s just the start.
I usually say that each one troubleshooting starts off at Layer one, the Bodily layer on the OSI design. The standard way of troubleshooting ISDN is sending pings across the connection, though the link is often tested without the need of utilizing pings as well as prior to assigning IP addresses to the BRI interfaces!
It’s a smart idea to location these examination phone calls ahead of configuring the interfaces – like that, you understand you’ve acquired a valid connection prior to commencing the configuration (and there’s a lot of config to go with ISDN!)
To place a examination connect with without having utilizing pings, utilize the isdn get in touch with interface command.
R1#isdn connect with interface bri0 8358662
R1#
03:fifty four:forty three: BR0 DDR: Trying to dial 8358662
03:fifty four:forty three: %Hyperlink-three-UPDOWN: Interface BRI0:one, adjusted point out to up
03:54:forty four: BR0:1 DDR: dialer protocol up
03:54:forty five: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, improved state to up
03:54:forty nine: %ISDN-6-Join: Interface BRI0:one has become linked to http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/먹튀검증 8358662 R2
To tear the take a look at phone down correctly, use isdn disconnect interface. IOS Enable displays the options using this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data get in touch with(s) on all b channels
b1 Disconnect the info contact on b1 channel
b2 Disconnect the information simply call on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:one DDR: disconnecting get in touch with
03:58:36: BR0:2 DDR: disconnecting simply call
03:58:36: %ISDN-6-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, simply call lasted 20 seconds
03:58:36: %Website link-3-UPDOWN: Interface BRI0:1, altered condition to down
03:fifty eight:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed condition to down
I say “correctly” since the one thing you don’t desire to do to finish an ISDN call, check or usually, is just shut the interface. Telcos don’t like it, and ISDN lab devices like it even considerably less. Usually let the d-channel do its perform and tear the call down within an orderly trend – don’t just Reduce it off by shutting the interface down.