configuration register is 0xf Why ?

VTP, Portfast, Spanning Tree and all the other switch related stuff.
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Guest

configuration register is 0xf Why ?

Post by Guest » Thu May 04, 2006 6:40 am


Hello All, I have to reload 5 switches tonight the units are WS-C2960G-24TC-L known as LANBASE switches. My question is I have always been taught the config-reg should be 0x2102, but on these switches is is 0xF, does anyone know why Cisco has changed this and if so where I might be able to find a document describing this change? Thank you all.DW

Guest

Re:configuration register is 0xf Why ?

Post by Guest » Thu May 04, 2006 6:58 am


DWSorry don't have a link to hand but the default configuration register setting on the 2960 switches is indeed 0xF and this cannot be changed. So you are okay to reload the switches.Jon

Guest

Re:configuration register is 0xf Why ?

Post by Guest » Thu May 04, 2006 7:01 am


Thank you John, I wonder why no documents on Cisco.com about this, they should know how scarry reloading switches can be. Thank AgainDonald

Guest

Re:configuration register is 0xf Why ?

Post by Guest » Thu May 04, 2006 8:04 am


Config-Register is basically a hexadecimal or decimal value that representsthe 16-bit configuration register value that will be used the next time the switch isrestarted. The value range is from 0x0 to 0xFFFF (0 to 65535 in decimal).The lowest four bits of the configuration register (bits 3, 2, 1, and 0) form the bootfield. The boot field determines if the router boots manually, from ROM, or from Flash orthe network. About the values:· If you set the configuration register boot field value to 0x0, you must boot theoperating system manually with the boot command.· If you set the configuration register boot field value to 0x1, the router boots usingthe default ROM software.· If you set the configuration register boot field to any value from 0x2 to 0xF, therouter uses the boot field value to form a default boot filename for booting from anetwork server.http://www.cisco.com/univercd/cc/td/doc ... wp10189900     Stays at the system bootstrap prompt (does not auto boot).01     Boots the first system image in onboard Flash memory.02 to 0F     Auto boots using image(s) specified by the BOOT environment variable. If more than oneimage is specified, the switch attempts to boot the first image specified in the BOOTvariable. As long as the switch can successfully boot from this image, the same image willbe used on a reboot. If the switch fails to boot from the image specified in the BOOTvariable, the switch will try to boot from the next image listed in the BOOT variable. Ifthe end of the BOOT variable is reached without the switch booting successfully, theswitch attempts the boot from the beginning of the BOOT variable. The auto boot continuesuntil the switch successfully boots from one of the images specified in the BOOT variable.

Guest

Re:configuration register is 0xf Why ?

Post by Guest » Thu May 04, 2006 9:08 am


Hi ,Nice replyChao Vishwa

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