When you first bring up a Cisco router, it will run a power-on self-test (POST). If it passes, it will then look for and load the Cisco IOS from flash memory-if an IOS file is present. (Just in case you don’t know, flash memory is an electronically erasable programmable read-only memory- an EEPROM.) After that, the IOS loads and looks for a valid configuration-the startup-config- that’s stored by default in nonvolatile RAM, or NVRAM.<\/p>\n
The next that router outputs is boot process. It’s information about the bootstrap program that first runs the POST, and then tells the router how to load, which by default is to find the IOS in flash memory. After the IOS is decompressed into RAM, the IOS is then loaded and starts running the router, as shown below (notice that the IOS version is stated as version 12.3[22]):<\/p>\n
Cisco Internetwork Operating System Software
\nIOS (tm) 3700 Software (C3745-ADVIPSERVICESK9-M), Version 12.3(22), RELEASE SOFTWARE (fc2)
\nTechnical Support: http:\/\/www.cisco.com\/techsupport
\nCopyright (c) 1986-2007 by cisco Systems, Inc.
\nCompiled Wed 24-Jan-07 18:55 by ccai
\nImage text-base: 0x60008AF4, data-base: 0x61F60000<\/code><\/p><\/blockquote>\nOnce the IOS is loaded, the information learned from the POST will be displayed next, as shown here:<\/p>\n
cisco 3745 (R7000) processor (revision 2.0) with 121856K\/9216K bytes of memory.
\nProcessor board ID XXXXXXXXXXX
\nR7000 CPU at 100MHz, Implementation 39, Rev 2.1, 256KB L2, 512KB L3 Cache
\nBridging software.
\nX.25 software, Version 3.0.0.
\n2 FastEthernet\/IEEE 802.3 interface(s)
\nDRAM configuration is 64 bits wide with parity enabled.
\n151K bytes of non-volatile configuration memory.
\n16384K bytes of ATA System CompactFlash (Read\/Write)<\/code><\/p><\/blockquote>\n<\/code>Once the IOS is loaded, and up and running, a valid configuration will be loaded from NVRAM. If there isn’t a configuration in NVRAM, the router will go into setup mode – a step-by-step process to help you configure the router. You can also enter setup mode at any time from the command line by typing the command\u00a0setup<\/b>\u00a0from something called privileged mode, which we’ll get to in a minute.<\/p>\nSetup Mode<\/h2>\n
You have two options when using setup mode:\u00a0Basic Management<\/i>\u00a0and\u00a0Extended Setup<\/i>. Basic Management only gives you enough configurations to allow connectivity to the router, but Extended Setup gives you the power to configure some global parameters as well as interface configuration parameters. To enter setup mode, just say “yes” or “y” to the following question:<\/p>\n--- System Configuration Dialog ---\u00a0<\/code><\/p>\nWould you like to enter the initial configuration dialog? [yes\/no]: y<\/p><\/blockquote>\n
Basic Management setup configures only enough connectivity for management of the system. But since you can do so much more with Extended Setup, this mode will ask you to configure each interface on the system, as seen here:<\/p>\n
Would you like to enter basic management setup? [yes\/no]: n\u00a0<\/code><\/p>\nFirst, would you like to see the current interface summary? [yes]:<\/p>\n
Interface IP-Address OK? Method Status Protocol
\nFastEthernet0\/0 unassigned YES unset administratively down down
\nFastEthernet0\/1 unassigned YES unset administratively down down<\/p>\n
Configuring global parameters:<\/p>\n
Enter host name [Router]:<\/p><\/blockquote>\n
I’ll stop here with this type of setup mode configurtion, because until now I didn’t saw someone to use it ;-)<\/p>\n","protected":false},"excerpt":{"rendered":"When you first bring up a Cisco router, it will run a power-on self-test (POST). If it passes, it will then look for and load the Cisco IOS from flash memory-if an IOS file is present. (Just in case you don’t know, flash memory is an electronically erasable programmable read-only memory- an EEPROM.) After that, … Read more<\/a>","protected":false},"author":5,"featured_media":0,"parent":100,"menu_order":23,"comment_status":"closed","ping_status":"closed","template":"cisco-page.php","meta":{"_acf_changed":false,"footnotes":""},"acf":[],"yoast_head":"\nBringing up a Cisco Router - learncisco.net<\/title>\n<meta name=\"description\" content=\"This article explains bringing up a cisco router. 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