Source address binding check

A system, comprising:

• a host coupled to a switch, the host being configured to provide to the switch a packet having a plurality of fields, the plurality of fields being configured to form a binding, the switch having first and second tables, wherein:
• the first table is configured to support a first lookup with a first lookup key, wherein the first lookup key comprises a first subset of the plurality of fields;
• and
• the second table is configured to support a second lookup with a second lookup key, wherein the second lookup key comprises a result of the first lookup and a second subset of the plurality of fields, and wherein the second table is configured to provide a result of the second lookup for indicating a check of the binding.

An apparatus, comprising:

• an input port configured to receive a packet having a plurality of fields, the plurality of fields being configured to form a binding;
• a first table configured to support a first lookup with a first lookup key, wherein the first lookup key comprises a first subset of the plurality of fields;
• and
• a second table configured to support a second lookup with a second lookup key, wherein the second lookup key comprises a result of the first lookup and a second subset of the plurality of fields, and wherein the second table is configured to provide a result of the second lookup for indicating a check of the binding.