About Cat 3550 enable secret passworld

Hello, everyone!
this day, I tried to change of password about my Catalyst 3550 L2/L3 Swithes.
but, I find out a problem.
next is process my change of enable password.
1. conf t
2. enable password xxx
3. ^z
4. conf t
5. enable secret xxx
6. ^Z
the end
I tried to enable password after disable.
but, I can't enter with changed password.
I don't know why can't enter.
Do you know this ?
and how to setting enable secret pasword ?
I would like know how to set-up enable secret password on cataylst 3550 switches.
thank you.
I will wait your answer.

The enable secret will override any enable password that may be configured . Use one or the other and delete the one you aren't using . The enable secret is the preferred password due to md5 encryption and which can't be cracked by those nice little cisco password breakers they out everywhere .
CONF T
no enable password
enable secret XXXXX

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