Quality of Service (QoS) Commands | 343
match ip precedence
This command adds to the specified class definition a match condition based on the value of the IP
Precedence field in a packet, which is defined as the high-order three bits of the Service Type octet in
the IP header (the low-order five bits are not checked).
Syntax
match ip precedence 0-6
The precedence value is an integer from 0 to 6.
Default
none
Mode
Class Map (The prompt is “(Config-classmap)#”.)
match ip tos
This command adds to the specified class definition a match condition based on the value of the IP
TOS field in a packet, which is defined as all eight bits of the Service Type octet in the IP header.
Syntax
match ip tos tosbits tosmask
The value of tosbits is a two-digit hexadecimal number from 00 to ff. The value of tosmask is a
two-digit hexadecimal number from 00 to ff.
The tosmask denotes the bit positions in tosbits 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 tosbits value of a0 (hex) and a tosmask of a2 (hex).
Default
none
Mode
Class Map (The prompt is “(Config-classmap)#”.)
match protocol
This command adds to the specified class definition a match condition based on the value of the IP
Protocol field in a packet using a single keyword notation or a numeric value notation.
Syntax
match protocol {protocol-name | 0-255}
Note: The IP DSCP, IP precedence, and IP TOS match conditions are alternative ways to
specify a match criterion for the same Service Type field in the IP header, but with a slightly
different user notation.
Note: The IP DSCP, IP precedence, and IP TOS match conditions are alternative ways to
specify a match criterion for the same Service Type field in the IP header, but with a slightly
different user notation.
Note: In essence, this the “free form” version of the IP DSCP/Precedence/TOS match
specification in that the user has complete control of specifying which bits of the IP Service
Type field are checked.
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