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Classifier-Based Software Configuration
Creating a Traffic Class
Valid values are the numeric value or corresponding
name of the DTR bit set. Some useful values are as
follows:
0 normal
2 max-reliability
4 max-throughput
8 minimize-delay
Default: 0 or normal.
To display a list of valid tos-value entries when you
enter tos in a match/ignore statement, type ?.
Notes: When used as a match criteria, the ToS/Traffic
Class byte entry is applied in addition to
all other
criteria configured in the match/ignore statement.
You can enter a match/ignore statement either with
or without a tos-value.
Figure 9-2 shows the DTR bit set in a ToS/Traffic Class
byte in an IPv4/IPv6 packet header and the difference
between the DSCP, DTR, and precedence bits.
[ vlan vlan-id ]
(Optional) Matches the VLAN ID number in the
Layer 2 header of 802.1Q VLAN packets to further
define match criteria. Valid VLAN IDs are from 1 to
4094.
Figure 9-2 uses a sample ToS/Traffic Class field of 10101000
to show the differences between the IP precedence (101),
DSCP (101010), and ToS/Traffic Class (10101000) bits. Note
that the rightmost two bits are reserved as 00.
Type-of-Service Byte (in IPv4 Header)
Traffic Class Byte (in IPv6 Header)
Differentiated Services Codepoint
Reserved
Precedence
Bits
Delay Throughput
Reliability Bits
1 0 1 0 1 0 0 0
Figure 9-2. Example of a ToS/Traffic Class Field
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