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How to restore an ISW switch to default settings if the password is unknown

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TitleHow to restore an ISW switch to default settings if the password is unknown
Objective
Restore an ISW to default settings while unable to log in
Environment
  • ISW
Procedure
Method 1:
  1. Physically loop a cable between ports 1 and 2
  2. Wait 20 seconds
  3. Reboot the switch by power cycling
  4. Wait for the log in prompt on console
  5. Remove the physical loop between ports 1 and 2
  6. Log in with the default credentials (Username: admin, Password: <blank>)
Method 2:

Alternate way to erase config is through the bootloader mode.
When ports do not function properly on the switch this method can be used:
Below are the steps for your reference:

1. Connect device via console cable
2. Restart the device and press Ctrl + C during the rebooting till it gets into RedBoot mode.
3. Type 'fis list' to show the config address and length

 
RedBoot> fis list
Name FLASH addr Mem addr Length Entry point
.FisValid 0x00000000 0x00000000 0x00000000 0x00000000
RedBoot 0x40000000 0x40000000 0x00020000 0x00000000
Conf 0x40040000 0x00000000 0x00040000 0x00000000
stackconf 0x40080000 0x00000000 0x00100000 0x00000000
syslog 0x40180000 0x00000000 0x00040000 0x00000000
managed.bk 0x401C0000 0x80040000 0x00600000 0x800400
BCmanaged 0x407C0000 0x80040000 0x00600000 0x800400BC

5. Type 'fis erase -f 0x40080000 -l 0x00100000' to erase stackconf, the first 0x00100000 is FLASH addr, second is Length
Please note, if the address is set incorrectly, the device may not be operating.
6. Type 'reset' for rebooting the device, and the config will restore to default.


 
Additional notes
The rest of the ports on the ISW should be disconnected from the network, to prevent any network impact from the loop that is created.

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