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Classifier-Based Software Configuration
Creating a Traffic Class
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 9-2).
[ precedence precedence-value ]
(Optional) Matches the three-bit IP precedence value
in IPv4 or IPv6 packets to further define match crite-
ria. 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
3 flash
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 criteria
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 9-2). 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 Reliability
(DTR) bit set in the IPv4 Type-of-Service or IPv6
Traffic Class byte to further define match criteria.
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