How can I use the cisco catalyst 3750 as a router for our police and fire departments

Hello Experts
I have 4 cisco Catalyst 3750 switches with IOS ™ C3750 Software (C3750-I9-M), Version 12.1(19)EA1d RELEASE SOFTWARE (fc1)
we need to connect our police and fire departments to cityhall with fiber. the 3 locations are on 3 different class b subnets.
My question is can I plug the fiber directly into a fiber GBIC on the 3750's and create VLANs and Route between them internally with the 3750. And if so how is this done. I have very little knowlege in working with cisco switches. I've done some internet searches but everything is so cryptic its hard to tell if what I'm reading is what I need to do.
bcinfosysAsked:
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culturaltrustCommented:
Yes you can connect your fiber to SFP (mini-GBIC)  fiber connectors on the 3750 and router between you VLAN's, you are on the correct IOS ver. to do this as well.  I would suggest setting up a WAN segment subnet with loopbacks on each switch, and NATing between them.  If this is not priv fiber, and security is an issue, I would suggest firewalls with NAT and VPN between them.

subnet1 -> NAT to Loopback inter switch 1 -> Loopback inter switch 2 -> Subnet 2.

Brushing up on routing protocols is not a bad idea either.

some suggest reading..

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008015f17a.shtml#prereq

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_book09186a00801cdea9.html

Hope this helps...
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culturaltrustCommented:
I would like to correct, after reading up a little more the 3750's do not support NAT, but they do support interVLAN routing, so you could just connect all three subnets to VLAN's in city hall and route between them.

sorry...
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