| Description | This attribute specifies the OR mask for the IPv4 TOS
value or IPv6 Traffic Class value. See the description
of TosAndMask for further details.
The IP TOS octet, as originally defined in RFC 791 has
been superseded by the 6-bit Differentiated Services
Field (DSField, RFC 3260) and the 2-bit Explicit Congestion
Notification Field (ECN field, RFC 3168).
The IPv6 Traffic Class octet RFC 2460 is consistent
with that new definition.
Network operators SHOULD avoid specifying values of
TosAndMask and TosORMask that would result in the modification
of the ECN bits. |