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Debug And Show Commands For ISDN
By Chris Bryant
The major reason I recommend getting your hands on real Cisco equipment rather than a simulator is that real Cisco routers give you the chance to practice and learn show and debug commands.
The knowledge you acquire from debugs is invaluable. Frankly, it's this knowledge that puts you above the "average" CCNA who doesn't have that hands-on experience. Watching debugs in action also gives you a head start on the CCNP. Since 90 - 95% of CCNAs go on to pursue the CCNP, it's a great idea to get started with debugs now.
Don't make the mistake of waiting until you're studying for your CCNP and CCIE to start learning debugs and shows. The work you do for the CCNA is the foundation for everything you'll do in the future.
Never, ever, ever practice debugs on a production network. There are debugs that will give you so much information that the router actually becomes overloaded and then locks up. Never practice debugs on a production network.
It's important to know the proper show and debug commands for ISDN for several reasons. First, by watching ISDN in operation, you can see its processes and better understand what's going on. Secondly, it's difficult if not impossible to properly troubleshoot ISDN without knowing the proper show and debug commands. (It's easy to overlook an ISDN authentication error just by looking at the configuration, but running debug ppp negotiation will quickly show you where the problem lies.)
Let's take a look at the ISDN show and debug commands that every CCNA and CCNP should know.
Show ISDN Status
If you only know one ISDN show command, it's got to be this one. Always use this command after configuring your ISDN switch type and any necessary SPIDs. The command will show you the switch type (and will also show you if you did not configure a switch type), and whether the SPIDs you entered are valid:
R1#show isdn status
Global ISDN Switchtype = basic-ni
ISDN BRI0 interface
dsl 0, interface ISDN Switchtype = basic-ni
Layer 1 Status:
Layer 2 Status:
TEI = 91, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
TEI = 92, Ces = 2, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
TEI 91, ces = 1, state = 5(init)
spid1 configured, no LDN, spid1 sent, spid1 valid
Endpoint ID Info: epsf = 0, usid = 1, tid = 1
TEI 92, ces = 2, state = 5(init)
spid2 configured, no LDN, spid2 sent, spid2 valid
Endpoint ID Info: epsf = 0, usid = 3, tid = 1
Layer 3 Status:
0 Active Layer 3 Call(s)
Activated dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Once in a while, you'll get this output from show isdn status:
R2#show isdn status
The current ISDN Switchtype = basic-ni1
ISDN BRI0 interface
Layer 1 Status:
Layer 2 Status:
Layer 2 NOT Activated
TEI Not Assigned, ces = 1, state = 3(await establishment)
spid1 configured, no LDN, spid1 NOT sent, spid1 NOT valid
TEI Not Assigned, ces = 2, state = 1(terminal down)
spid2 configured, no LDN, spid2 NOT sent, spid2 NOT valid
Check your running configuration, and if the SPIDs look good, simply close the BRI interface and open it again. Then run show ISDN status again. If you then see "spids are valid", you're ready to proceed. If you still see a message that the spids are invalid, you've most likely mistyped the SPID.
Read the Rest of the Article
About the Author:
Chris Bryant, CCIE™ #12933, has been active in the Cisco certification community for years. He worked his way up from the CCNA to the CCIE, and knows what CCNA and CCNP candidates need to know to be effective on the job and in the exam room.
He is the owner of http://www.thebryantadvantage.com. You're invited to visit our site and check out our CCNA and CCNP courses and study aids. Chris is always glad to hear from Cisco certification candidates at firstname.lastname@example.org.