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IP header. The TOS Bits value is a hexadecimal number from 00 to FF. The TOS Mask value
is a hexadecimal number from 00 to FF. The TOS Mask denotes the bit positions in the TOS
Bits value that are used for comparison against the IP TOS field in a packet. For example, to
check for an IP TOS value having bits 7 and 5 set and bit 1 clear, where bit 7 is most
significant, use a TOS Bits value of 0xA0 and a TOS Mask of 0xFF. This is an optional
configuration.
4.5.2 Differentiated Services
Packets are filtered and processed based on defined criteria. The filtering criteria is defined by a class.
The processing is defined by a policy's attributes. Policy attributes may be defined on a per-class
instance basis, and it is these attributes that are applied when a match occurs.
The configuration process begins with defining one or more match criteria for a class. Then one or more
classes are added to a policy. Policies are then added to interfaces.
Packet processing begins by testing the match criteria for a packet. The 'all' class type option defines that
each match criteria within a class must evaluate to true for a packet to match that class. The 'any' class
type option defines that at least one match criteria must evaluate to true for a packet to match that class.
Classes are tested in the order in which they were added to the policy. A policy is applied to a packet
when a class match within that policy is found.
4.5.2.1 Diffserv Configuration
Selection Criteria
DiffServ Admin Mode - This lists the options for the mode, from which one can be selected.
The default value is 'enable'. While disabled, the DiffServ configuration is retained when
saved and can be changed, but it is not activated. When enabled, Diffserv services are
Figure 4-81 ACL Rule Configuration
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