- Catalyst 3550 Multilayer Switch -

Recovery Procedures

Recovering from Corrupted Software
Recovering from a Lost or Forgotten Password
Recovering from a Command Switch Failure
Recovering from Lost Member Connectivity

Autonegotiation Mismatches

Connectivity Problems

Understanding Ping
Executing Ping
Understanding IP Traceroute
Executing IP Traceroute

Debug Commands

Enabling Debugging on a Specific Feature
Enabling All-System Diagnostics
Redirecting Debug and Error Message Output

1.Recovering from Corrupted Software

Step 1 Connect a PC with terminal-emulation software supporting the XMODEM Protocol to the switch console port.

Step 2 Set the line speed on the emulation software to 9600 baud.

Step 3 Unplug the switch power cord.

Step 4 Press the Mode button, and at the same time, reconnect the power cord to the switch.

You can release the Mode button a second or two after the LED above port 1X goes off. Several lines of information about the software appear along with instructions:

The system has been interrupted prior to initializing the flash file system. The following
commands will initialize the flash file system, and finish loading the operating system




Step 5 Initialize the Flash file system:

switch: flash_init

Step 6 If you had set the console port speed to anything other than 9600, it has been reset to that particular speed. Change the emulation software line speed to match that of the switch console port.

Step 7 Load any helper files:

switch: load_helper

Step 8 Start the file transfer by using the XMODEM protocol.

switch: copy xmodem: flash:image_filename.bin

Step 9 When the XMODEM request appears, use the appropriate command on the terminal-emulation software to start the transfer and to copy the software image into Flash memory.

xmodem으로 image upload시 엄청난 시간을 필요로 합니다

xmodem upload


해당 link로 가시면 c3550의 Troubleshooting을 모두 확인해 볼 수 있습니다.
3548에서 vlan 설정시 shutdown이 풀리지 않는다면
다른 vlan ex)vlan 1을 shutdown후 추가된 vlan을 no shutdown 한다면 정상적으로 setting 된다.
IOS switch password recovery

전원 off -> mode 버튼 누름 & 전원 on -> flash_init -> load_helper -> rename(config.text) -> boot -> rename -> 암호 설정 및 저장

CatOS switch password recovery

1.switch를 reboot 시킨다.
2.switch booting 후 cisco systems console라는 메세지가 나온후 Enter Password: 라는 말이 나오면 [Enter]
3.Console> 프롬프트가 나오면 enable mode로 들어 간다.
4.set password,set enablepass를 치고 null 값을 입력 한다..

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