8-11
Classifier-Based Software Configuration
Traffic Classes
To display a list of valid codepoint entries when you
enter ip-dscp in a match/ignore statement, type ?.
The DSCP codepoints are the leftmost six bits of the
ToS/Traffic Class byte (see Figure 8-2).
[ precedence precedence-value ]
(Optional) Matches the three-bit IP precedence value
in IPv4 or IPv6 packets to further define match
criteria. Valid values for precedence-value are either
the numeric value (0 to 7) or corresponding name
of an IP precedence bit set:
0 routine
1 priority
2 immediate
3flash
4 flash-override
5 critical
6 internet (for internetwork control)
7 network (for network control)
To display a list of valid precedence-value entries
when you enter precedence in a match/ignore state-
ment, type ?.
Notes: When used as a match criteria, the IP prece-
dence value is applied in addition to
all other crite-
ria configured in the match/ignore statement. You
can enter a match/ignore statement either with or
without a precedence-value.
The IP precedence bits are the leftmost three bits of
the ToS/Traffic Class byte (see Figure 8-2). The
numeric value (0 to 7) of the IP precedence bits
corresponds to the hexadecimal equivalent of the
three binary “0” and/or “1” bits in the IP precedence
field. For example if the IP precedence-bit binary
values are 111, the numeric value is 7 (1+2+4).
Similarly, if the IP precedence bits are 010, the
numeric value is 2 (0+2+0).
[ tos tos-value ]
(Optional) Matches the Delay Throughput Reliabil-
ity (DTR) bit set in the IPv4 Type-of-Service or IPv6
Traffic Class byte to further define match criteria.
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