About TOS DiffServ

TOS and DiffServ are two different mechanisms used to achieve QoS in enterprise and service provider networks; they are two different ways of marking traffic to indicate its priority to upstream devices in the network.

For more information about TOS (packet) marking, refer to:

• IETF RFC 1349 (http://www.ietf.org/rfc/rfc1349.txt)

For more information about DiffServ, refer to:

• IETF RFC 2474 (http://www.ietf.org/rfc/rfc2474.txt)
• IETF RFC 2475 (http://www.ietf.org/rfc/rfc2475.txt).