How to reset password for a CISCO 3750 switch

We have couple of HP switches and these switches are connected through a fibre link to a Cisco 3750 (One link goes to switch- A and another goes to switch- B)

My predecessor had installed these switches and implemented LACP on these core CISCO 3750 switches please see the attached. All I know is we had some power fluctuations and the Core switches are connected to UPS , but not the HP edge switches. Now  the PCs connected to the HP switches are not getting any IP from DHCP, I can see the link on both the sides. I think the fibre uplink port on the Cisco is disabled for some reasons.

These are other HP switches connected to the other fibre ports on the Cisco3750 switch and I am able to ping and get IP no  issues.

They didn’t leave any password with me to log into this switch and check as why these fibre uplink ports are not working. This core switch contains lots of configuration and VLAN information.

Please can someone post me step by step instructions to reset the password without loosing any configuration.
Any help much appreciated.

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i used the procedure of the following link:

it worked like a charm

hope this helps

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lianne143Author Commented:
I can see only one IP address documented for the Cisco 3700. I am not familiar with the LACP. As per the diagram will this both switch act as one switch with one IP address?
LACP will do port aggregation to increase bandwidth, more physical ports aggregated on a single logical port.
you may want to read the following:

From your diagram it seems that the 2 cisco switch are as well in stack configuration: this means that they are seen as a single switch with its ports cumulated. You will see Gi0/0, Gi0/1 ... Gi0/24 and then Gi1/0, Gi1/1 ... Gi1/24. They are treated as a single switch, one of them is master and the other one is slave.
When you do "show switch" you see who is who.

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lianne143Author Commented:
Hi Max
I am not very familiar with Cisco  switches,
I have a spare Cisco 3560G  series. I am trying to replicate a password recovery on this switch before I could do on the actual Catalyst 3750-X , 24 Port IP Base switch.
Will it be the same password reset procedure for Catalyst 3750  as I do for 3560.
Do I need to do the password reset procedure on the Master switch.
yes it will be the same.
I guess the procedure should be done on the master switch.
lianne143Author Commented:
I can see on one of the Cisco switch , there  master LED is active and on other switch it is not active.
that is the one !
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