【正文】 ength Name/status 1 10084696 [10084760 bytes used, 6692456 available, 16777216 total] 16384K bytes of processor board System flash (Read ONLY) 32 169。 2022, Cisco Systems, Inc. All rights reserved. 3901_11_2022_c5 Routershow flash System flash directory: File Length Name/status 1 10084696 [10084760 bytes used, 6692456 available, 16777216 total] 16384K bytes of processor board System flash (Read ONLY) 確認(rèn)存貯空間并解析文件名 確認(rèn) Flash中有足夠空間來存放 IOS映象文件 46 169。 2022, Cisco Systems, Inc. All rights reserved. 3901_11_2022_c5 映象文件備份的準(zhǔn)備 ? 確認(rèn)可以訪問到網(wǎng)絡(luò)服務(wù) 路由器 網(wǎng)絡(luò) 服務(wù)器 42 169。 2022, Cisco Systems, Inc. All rights reserved. 3901_11_2022_c5 設(shè)定配置寄存器的值 配置寄存器的 3, 2, 1和 0位是啟動(dòng)選項(xiàng)位 配置寄存器啟動(dòng)選項(xiàng)部分的值 0x100 含義 進(jìn)入 ROM monitor模式 (人工啟動(dòng)時(shí)用 b 命令 ) Routerconfigure terminal Router(config)configregister 0x2102 [CtrlZ] Routerreload 28 169。閃存在掉電時(shí)同樣會(huì)保持內(nèi)容。 2022, Cisco Systems, Inc. All rights reserved. 3901_11_2022_c5 用 Tel 連接到遠(yuǎn)端設(shè)備 遠(yuǎn)端設(shè)備 S0 S1 RouterAtel Trying ... Open Catalyst 1900 Management Console Copyright (c) Cisco Systems, Inc. 19931998 All rights reserved. Enterprise Edition Software Ether Address: 009086733340 PCA Number: 73223906 PCA Serial Number: FAA02359H8K Model Number: WSC1924EN System Serial Number: FAA0237X0FQ . . SwitchB 交換機(jī) B 路由器 A 路由器 B 交換機(jī) A 10 169。 2022, Cisco Systems, Inc. All rights reserved. 3901_11_2022_c5 交換機(jī) A同時(shí)也顯示其 Mac地址 使用 show cdp neighbor 命令 RouterAsh cdp neighbors Capability Codes: R Router, T Trans Bridge, B Source Route Bridge S Switch, H Host, I IGMP, r Repeater Device ID Local Intrfce Holdtme Capability Platform Port ID RouterB Ser 0 148 R 2522 Ser 1 SwitchA0050BD855780 Eth 0 167 T S 1900 2 S0 S1 交換機(jī) B 路由器 A 路由器 B 交換機(jī) A 7 169。 2022, Cisco Systems, Inc. All rights reserved. 3901_11_2022_c5 內(nèi)部資源 —— Flash Memory ? Flash Memory ? 閃存是一種特殊的可擦除的，可編程的只讀內(nèi)存。 2022, Cisco Systems, Inc. All rights reserved. 3901_11_2022_c5 路由器啟動(dòng)流程圖 Use IOS from Flash Attempt to get IOS from work Use IOS in ROM (RXBoot mode) Check startup config Boot field =0 0x0 Boot field =1 0x1 Boot system mands ? Config reg bit 13=1 ? 5 failures ? Valid IOS in Flash ? Do what they say Run ROM Monitor START Yes Yes No No Yes No No Yes Yes No No Yes Success ? No Yes Use file from Network Load IOS Valid config ? Config reg bit 6=1 ? Yes No Yes SETUP DIALOG NORMAL START UP COMPLETE No 25 169。 2022, Cisco Systems, Inc. All rights reserved. 3901_11_2022_c5 使用 copy run tftp 和 copy tftp run 命令 Routercopy runningconfig tftp Address or name of remote host []? Destination filename [runningconfig]? .!! 1684 bytes copied in secs (129 bytes/sec) Routercopy tftp runningconfig Address or name of remote host []? Source filename []? Destination filename [runningconfig]? Accessing Lo