My understanding is that the router will: 1. Run through POST (Bootstrap loader is in control, code in ROM executes diagnostics) 2. Attempt to load IOS a.) Flash b.) Network c.) Boot (which is a small piece of IOS located in ROM, just enough to get the router up) 3. Perform hardware inventory 4. Load Configuration a.) NVRAM b.) Network c.) Initial Config/Setup Dialog (this is if there is no config in NVRAM)
You can probably drill these down even a bit further. For instance, after the POST runs, the router will check the configuration-register boot field value for advice as to where to get the IOS from. What's more, before the IOS is loaded the router will scan the configuration file in NVRAM (if one is there) for any boot system commands. I'll search CCO to see if I can find a good link for you. Chris -----Original Message----- From: nettable_walker [mailto:[EMAIL PROTECTED]] Sent: Wednesday, December 12, 2001 11:41 PM To: [EMAIL PROTECTED] Subject: boot sequence on router [7:29029] 12/12/2001 10:42pm Wednesday Professionals, I am researching the default behavior of the Cisco router during boot up. I am very familiar with the "hands on" side of upgrading flash & RAM on 2500 & 2600's but I need a "text book" answer. I searched Cisco's site for "boot process" & "boot sequence" and do not really see what the router's default behavior is. Is a router with config reg 0x2102 supposed to boot from flash, then network, then NVRAM ? If a router is set to boot from flash:c2600-d-mz.113-10.T.bin but it cannot find c2600-d-mz.113-10.T.bin on the flash what will it do, and in what order ? Any help would be really appreciated. Thanks, Richard // Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=29053&t=29029 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
