On the 5000 Both the software (CatOS) and hardware have to support dot1q. The 5225 which supports ISL will not support dot1q, hence the need for a revised version the 5225R. If you have a software image which doesn't support dot1q, it will not support the hardware necessary to support dot1q. I've never played with dot1q on the supervisors interfaces, this may be a different story, but I suspect that the Sup1 only supports ISL.
David David C Prall [EMAIL PROTECTED] http://dcp.dcptech.com ----- Original Message ----- From: "Sean Knox" To: Sent: Wednesday, January 30, 2002 4:58 PM Subject: RE: Worth upgrading Supervisor on Cat5k? (was: How prevalent is [7:33770] > You bring up a point I was going to bring up... I have a cat5k with a > supervisor I (I believe)-- doesn't support dot1q. I was thinking of > upgrading the supervisor engine to a version that does support dot1q, but > was curious to known issues. Could you elaborate more about that problem you > mentioned? (changing dot1q trunks to isl) > > - Sean > > -----Original Message----- > From: Mike Bernico [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 30, 2002 1:54 PM > To: 'Sean Knox' > Subject: RE: How prevalent is ISL in the "real world"? [7:33759] > > > We mostly use .1q, but i heard it is still better to use isl on old c5ks > because even if they support .1q they still change it to isl on their > backplane. > > mike > > ------------------- > Mike Bernico [EMAIL PROTECTED] > Illinois Century Network http://www.illinois.net > (217) 557-6555 > > > > -----Original Message----- > > From: Sean Knox [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, January 30, 2002 2:52 PM > > To: [EMAIL PROTECTED] > > Subject: How prevalent is ISL in the "real world"? [7:33759] > > > > > > Is ISL still widely used? Are there still many shops out > > there using it? (I > > assume Cisco only outfits) It seems that Cisco has all but > > dropped support > > for it in favor of dot1q. > > > > Sean Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=33801&t=33801 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
