Cisco CCNA / CCNP Test Tutorial: Tests ISDN Links Without Pings
To receive your Cisco CCNA and CCNP certifications, you’ve got to grasp ISDN – and In spite of what some individuals say, there’s nevertheless many 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 right ISDN switchtype configured? Would be the dialer map statements proper? How about the dialer-group and dialer-list commands? And that’s just the start.
I normally say that every one troubleshooting begins at Layer one, the Physical layer of the OSI model. The same old technique of troubleshooting ISDN is sending here pings through the hyperlink, nevertheless the link may be tested without using pings or maybe before assigning IP addresses to your BRI interfaces!
It’s a smart idea to place these examination calls prior to configuring the interfaces – like that, you understand you’ve obtained a legitimate link in advance of starting the configuration (and there’s many config to associate with ISDN!)
To put a check call devoid of using pings, use the isdn get in touch with interface command.
R1#isdn phone interface bri0 8358662
R1#
03:54:43: BR0 DDR: Seeking to dial 8358662
03:54:43: %LINK-three-UPDOWN: Interface BRI0:one, changed condition to up
03:54:forty four: BR0:one DDR: dialer protocol up
03:fifty four:45: %LINEPROTO-five-UPDOWN: Line protocol on Interface BRI0:1, transformed point out to up
03:fifty four:49: %ISDN-6-CONNECT: Interface BRI0:one has become linked to 8358662 R2
To tear the take a look at simply call down the right way, use isdn disconnect interface. IOS Assist shows the choices with this particular command.
R1#isdn disconnect interface bri 0 ?
all Disconnect the data connect with(s) on all b channels
b1 Disconnect the data phone on b1 channel
b2 Disconnect the info phone on b2 channel
R1#isdn disconnect interface bri 0 all
03:58:36: BR0:1 DDR: disconnecting call
03:58:36: BR0:2 DDR: disconnecting call
03:58:36: %ISDN-six-DISCONNECT: Interface BRI0:one disconnected from 8358662
R2, simply call lasted 20 seconds
03:58:36: %Website link-three-UPDOWN: Interface BRI0:one, altered point out to down
03:58:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:one, altered state to down
I say “effectively” since the another thing you don’t would like to do to finish an ISDN contact, take a look at or otherwise, is just shut the interface. Telcos don’t like it, and ISDN lab gadgets like it even significantly less. Always Allow the d-channel do its perform https://www.washingtonpost.com/newssearch/?query=먹튀검증 and tear the call down in an orderly manner – don’t just Slash it off by shutting the interface down.