Thanks for the additional answer. Cisco says to check the cable, yes, but they don't go so far as to say that's the only time you would see down/down. They say the meaning is no CD. Well, when is there no CD? Of course there's no CD if the cable is bad. I think there are other situations where there's no CD also. Cisco also says that down/down could be a telco problem. See here:
http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1915.htm#xtocid195572 This may be one of those things that will remain a mystery. I can reword the sentence to make sure the reader knows to check hardware when an interface is down/down. I would love to say more, but I don't think I better without confirmation. Priscilla At 09:56 PM 6/20/02, Michael L. Williams wrote: >According to CCIE exam materials, the *only* time the serial will show >down/down is when there is NO serial cable or a bad serial cable connected. >So even if you have a misconfigured framing method, you should at least see >up/down..... > >Mike W. > >----- Original Message ----- >From: "Priscilla Oppenheimer" >Newsgroups: groupstudy.cisco >Sent: Thursday, June 20, 2002 5:34 PM >Subject: serial interface down/down or up/down [7:47101] > > > > Hi Group Study, > > > > While writing some questions for a practice test, I found myself > > questioning what I thought was the right answer. Here's the scenario: > > > > A Cisco router serial interface is correctly connected with a good V.35 > > cable to the data port on the DSU side of a CSU/DSU. The CSU/DSU has been > > misconfigured for the framing method (SF instead of ESF). The framing > > doesn't match what the provider is using. (The question refers to a >CSU/DSU > > that is external to the router, not one that is built into the router.) > > > > Will the Cisco router serial interface be down/down or up/down? > > > > And, would the answer be any different if the question has to do with > > misconfiguring the encoding (AMI versus B8ZS)? > > > > If you have real-world experience with this, that would help. I have read > > the Cisco documentation and the troubleshooting charts, etc. > > > > Thanks > > > > Priscilla > > > > ________________________ > > > > Priscilla Oppenheimer > > http://www.priscilla.com ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47150&t=47101 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
