DHCP snooping

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untrusted ports:

- when we enable DHCP snooping, all ports will be untrusted ports

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trusted port: the port where dhcp server is residing. we have to manually configure it.

- DHCP client msgs like Discover, request,decline and release are only allowed from untrsuted port to trusted port

-DHCP server msgs like offer,ack,nack are only allowed to ingress from trusted ports

- DHCP discover msgs will be only send to trusted ports.

- DHCP will keep MAC address and port details in its database

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