what is interface spoofing on switch gigabit interface

[mahesh18]

what is interface spoofing on switch gigabit interface

switch is 3560

keepalives are not set on interface

[jsivulka]

Yes, although on a Cat3560 a MAC ACL can deny a frame based on the source MAC address it cannot prevent the switch from learning the source MAC address of the frame.

[Edison Ortiz]

I believe you are referring DHCP Snooping along with the IP Source Guard features available in the 3560

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_37_se/configuration/guide/swdhcp82.html

HTH,

__

Edison.