Hello Dhaval,
1. Can I configure Multiple DHCP pool on C3750?
Yes, you can, provided that each DHCP pool is tied to a different IP network. You simply create multiple pools distinguished by their unique names, and assign each pool to a particular network using the usual network command.
2. Performance effect due to same?
Performance impact is negligible, as the DHCP is used only when stations acquire their IP settings. There would have to be hundreds, if not thousands of stations requesting DHCP communication in order for the performance impact to be measurable. With sensible lease times in orders of hours, you will not notice any increased load.
3. Can I resrve IP addrese from DHCP pool for specific MAC address.
Yes, that is possible, although the configuration is awkward. Check the following two documents (actually, it's just a single document with two sections relevant to your question):
http://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_dhcp/configuration/12-4t/config-dhcp-server.html#GUID-68D87544-7C6F-48C9-9DFE-56F5B7E4A89D
http://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_dhcp/configuration/12-4t/config-dhcp-server.html#GUID-BCEB43D4-8C44-4C86-BBAA-6B977196D35C
The configuration examples can also be found later in the same document.
4. Can I Exempt IP address from DHCP pool ?
Yes, you can. This is done using the ip dhcp excluded-address command in the global configuration mode (i.e. this command is not entered in any particular DHCP pool). More information can be found here:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_dhcp/configuration/12-4t/config-dhcp-server.html#GUID-9DFE5A79-4529-4DD9-BB7B-CB46C10E9ABE
Best regards,
Peter
