Cisco CCNA / CCNP Test Tutorial: Screening ISDN Back links With out Pings
To make your Cisco CCNA and CCNP certifications, you’ve bought to learn ISDN – and Regardless of what a number of people say, there’s still a great deal of ISDN in existence that needs to be supported. And In regards to troubleshooting ISDN, there’s quite a bit to have http://www.bbc.co.uk/search?q=먹튀검증 a look at. Is the right ISDN switchtype configured? Will be the dialer map statements correct? How about the dialer-group and dialer-list instructions? And that’s just the start.
I normally say that each one troubleshooting starts off at Layer 1, the Physical layer on the OSI model. The usual method of troubleshooting ISDN is sending pings across the backlink, however the link is usually examined with out working with pings or even prior to assigning IP addresses for the BRI interfaces!
It’s a smart idea to place these test calls prior to configuring the interfaces – that way, you understand you’ve received a sound relationship ahead of starting the configuration (and there’s plenty of config to go with ISDN!)
To put a check connect with with out utilizing pings, make use of the isdn get in touch with interface command.
R1#isdn phone interface bri0 8358662
R1#
03:54:forty three: BR0 DDR: Attempting to dial 8358662
03:54:43: %Url-three-UPDOWN: Interface BRI0:one, modified state to up
03:fifty four:forty four: BR0:one DDR: dialer protocol up
03:fifty four:forty five: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:one, changed state to up
03:fifty four:49: %ISDN-6-Hook up: Interface BRI0:1 has become linked to 8358662 R2
To tear the examination call down properly, use isdn disconnect interface. IOS Aid shows the choices with this command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data simply call(s) on all b channels
b1 Disconnect the information contact 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
03:58:36: BR0:two DDR: disconnecting call
03:fifty eight:36: %ISDN-6-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, simply call lasted 20 seconds
03:fifty eight:36: %LINK-3-UPDOWN: Interface BRI0:1, changed point out to down
03:fifty eight:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:one, modified state to down
I say “accurately” since the one thing you don’t wish to do to finish an ISDN phone, check or otherwise, is just shut the interface. Telcos don’t like it, and ISDN lab units like it even fewer. Always Permit the d-channel do its function and tear the call down in an orderly fashion – don’t just cut it off by shutting the interface 토토사이트 down.