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Why does "Enter passphrase:" show up during boot?

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TitleWhy does "Enter passphrase:" show up during boot?
Symptoms
When booting a EXOS switch on 21.1 or 16.2 you see "Enter passphrase:" and sometimes EXOS reboots.

 
Starting ExtremeXOS 21.1.2b14
Copyright (C) 1996-2016 Extreme Networks.  All rights reserved.
This product is protected by one or more US patents listed at http://www.extremenetworks.com/patents along with their foreign counterparts.


(pending-AAA) login: 

Authentication Service (AAA) on the master node is now available for login.

Enter passphrase: load failed
Disabling protocol version 2. Could not load host key
Process exsshd pid 2119 died with signal 11
sshd: no hostkeys available -- exiting.

Code:
55563094  8e020000 lw     v0,0(s0)
55563098  0017b080 sll    s6,s7,0x2
5556309c  00561021 addu   v0,v0,s6
555630a0 <8c440000>lw     a0,0(v0)
555630a4  1091000e beq    a0,s1,0x555630e0
555630a8  8f99909c lw     t9,-28516(gp)
555630ac  0320f809 jalr   t9
555630b0  00000000 nop
555630b4  8fc30000 lw     v1,0(s8)

 
Environment
  • EXOS 16.2 or 21.1
  • SSH
Cause
This happens when EXOS loads a configuration file (.cfg) that has SSH enabled, but the switch doesn't have a SSH key in the eeprom.


 
Resolution
Solution 1:
  1. Upgrade to EXOS 22.1 and above or 16.2.3 which contains a fix for CR xos0067251 

Solution 2:
  1. Reboot the switch into the bootrom, and do "config none" to boot a default config
  2. Use the command "enable ssh" to create a private key in the eeprom.
  3. Use the command "use configuration <config_file.cfg>", and reboot back into the original config file.
Additional notes

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