SUP720啟動(dòng)過程詳解
一、 上電自檢過程
（1） 引擎加電后，由電源電路來完成引擎的上電和對(duì)線卡的基本信息的訪問。
其中，電源管理芯片（U71）的工作電壓主要是有背叛的A3.3V（經(jīng)P1）提供。
（2） 同時(shí)，系統(tǒng)控制器(U66) 也會(huì)對(duì)電路進(jìn)行檢測(cè)，將檢測(cè)到的信息與U58（EEPROM）里面
的信息進(jìn)行對(duì)照，根據(jù)結(jié)果發(fā)給電源管理芯片（U71）一個(gè)信號(hào)，來決定是否繼續(xù)給電路加電。
（3） 在加電自檢（POST）過程中，引擎執(zhí)行ROM內(nèi)的加電自檢診斷程序，對(duì)CPU，內(nèi)存、網(wǎng)絡(luò)接口的情況進(jìn)行檢查。
確定硬件正常后，開始對(duì)軟件進(jìn)行初始化過程。
二、軟件初始化過程
（1）首先，執(zhí)行ROM（SP中的BOOTROM）中引導(dǎo)加載程序 （GENERIC BOOTSTRP LOADER）
ROM 在SP和RP的軟件控制之下，SP和RP的boot code 在flash中，ROM monitor和boothelper也在FLASH中。
（2）其次，系統(tǒng)對(duì)軟件進(jìn)行引導(dǎo)，啟動(dòng)映像。從FLASH中加載CISCO IOS 軟件。將IOS的內(nèi)容復(fù)制到內(nèi)存中，在內(nèi)存中運(yùn)行。

Cisco IOS 軟件存放的地方很多，缺省從FLASH中查找IOS軟件映像，實(shí)際加載過程是根據(jù)配置寄存器的啟動(dòng)字段（bootfield）來加載。
（3）IOS 加載細(xì)微過程。SP 初始自己的啟動(dòng)進(jìn)程，解壓IOS中SP的鏡像，加載到SP 的DRAM，當(dāng)switch Processor鏡像
完全啟動(dòng)，移交個(gè)RP，進(jìn)行RP啟動(dòng)。Router processor 從Flash (botflash)中下載RP鏡像到RP DRAM中進(jìn)行解壓縮，等到全部解壓縮之后
進(jìn)入console CLI，同時(shí)查找有效的配置文件，一般這些配置文件保存到NVRAM中，然后將這些配置文件加載入主存中，然后逐行執(zhí)行。

一下通過一臺(tái)7609設(shè)備的啟動(dòng)過程 詳細(xì)介紹 IOS的加載過程
System Bootstrap, Version 12.2(33r)SRB4, RELEASE SOFTWARE (fc1) //SP 中的 ROM 執(zhí)行引導(dǎo)加載程序
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2007 by cisco Systems, Inc.
C7600-RSP720/SP platform with 1048576 Kbytes of main memory // switch process 先行啟動(dòng),進(jìn)行初始化

Autoboot executing command: “boot bootdisk:c7600rsp72043-advipservicesk9-mz.122-33.SRD5.bin” //通過bootfile 加載 flash中的IOS

Initializing ATA monitor library… //SP 中的的 montior 進(jìn)行設(shè)備自檢

Self extracting the image… [OK] //IOS執(zhí)行自我解壓縮
Self decompressing the image : ###########################################此處省略##
Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software – Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706

Cisco IOS Software, c7600rsp72043_sp Software (c7600rsp72043_sp-ADVIPSERVICESK9-M), Version 12.2(33)SRD5, RELEASE SOFTWARE (fc2) //加載SP軟件
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Sat 02-Oct-10 18:47 by prod_rel_team
Image text-base: 0x0800015C, data-base: 0x0C000000
*Aug 14 16:09:48.079: %SYS-SP-3-LOGGER_FLUSHING: System pausing to ensure console debugging output.

*Aug 14 16:09:44.851: %PFREDUN-6-ACTIVE: Initializing as ACTIVE processor //進(jìn)行進(jìn)程初始化

*Aug 14 16:09:48.079: %OIR-SP-6-CONSOLE: Changing console ownership to route processor //SP進(jìn)程初始完成移交給 RP 進(jìn)程

———————下面進(jìn)行 RP的IOS加載過程 同 SP 過程

System Bootstrap, Version 12.2(33r)SRB4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2007 by cisco Systems, Inc.
C7600-RSP720/RP platform with 1048576 Kbytes of main memory

Download Start
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!此處省略!!!!
Download Completed! Booting the image.
Self decompressing the image : ########################################此處省略######
Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software – Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706

Cisco IOS Software, c7600rsp72043_rp Software (c7600rsp72043_rp-ADVIPSERVICESK9-M), Version 12.2(33)SRD5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Sat 02-Oct-10 18:39 by prod_rel_team
Image text-base: 0×08000224, data-base: 0×10000000
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco CISCO7609-S (M8500) processor (revision 1.0) with 917504K/65536K bytes of memory. // 全部加載完成，進(jìn)行配置的加載
Processor board ID FOX1138114F
BASEBOARD: RSP720
CPU: MPC8548_E, Version: 2.0, (0×80390020)
CORE: E500, Version: 2.0, (0×80210020)
CPU:1200MHz, CCB:400MHz, DDR:200MHz,
L1: D-cache 32 kB enabled
I-cache 32 kB enabled

Last reset from power-on
1 Virtual Ethernet interface
148 Gigabit Ethernet interfaces
8 Ten Gigabit Ethernet interfaces
3964K bytes of non-volatile configuration memory.

500472K bytes of Internal ATA PCMCIA card (Sector size 512 bytes).
% Hostname “xxx-NGN-CE04-C ” is not a legal LAT node name, Using “CISCO_000000″
%Warning: the ratio between logging persistent size and logging persistent filesize is 128000000/16000, suggested ratio is less than 196 in order to achieve good system performace

Press RETURN to get started! // 進(jìn)入Console CLI模式

• 上一篇：路由器與交換機(jī)的區(qū)別
• 下一篇：IBM思科壟斷我國(guó)核心路由器 H3C如何定位?