SPID is a layer 2 feature if the ISDN switch type requires it. You can monitor it w/ the debug isdn q921. That command will debug information passed along the D channel. debug isdn q931 will monitor layer 3 traffic over the BRI lines. I have the CIT book but I don't recall seeing that error, what page is it on? It's incorrect because layer 3 depends on layer 2 to be active. Hope that helps! Russ.. ""Hou, Li"" <[EMAIL PROTECTED]> wrote in message 8iedt3$ajl$[EMAIL PROTECTED]">news:8iedt3$ajl$[EMAIL PROTECTED]... > Which debug command is to used to monitor ISDN spid error? > In Cisco CIT book, it said using debug isdn q931, > but in Cisco Network Design (CCIE Books), it said using debug isdn q921. > I want to know in a CIT exam, which is right? > > > > ___________________________________ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > --- ___________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
