Narender,
I booted up a 48si in the lab and tried this in v7.8.4.1-patch1-4. For both telnet and SSH, I was disconnected after 3 tries as expected. However, this behavior does not appear to be configurable as it is in EXOS (which is what Ron's commands above are from).
The default is three consecutive login attempts before being disconnected. You can disable the account entirely, but that's probably not what you want to do.
The command for this is:
code:configure account [all | ] password-policy lockout-on-login-failures [on | off]
The default is
off. You would have to login from another admin account and use the
code:clear account lockout
command to unlock the account.
You can also see how many successful and failed attempts there are for a given account.
Summit48si:7 # show accounts
User Name Access LoginOK Failed User Type
---------------- ------ ------- ------ ---------
admin R/W 4 11 Admin
user RO 0 0 User
--------------------------------------------------
(*) - Account lockedHope this helps.