624 DiffServ Class Commands
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.
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. 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). Use the [not] option to negate the match condition.
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.
This “free form” version of the IP DSCP/Precedence/TOS match specification
gives the user complete control when specifying which bits of the IP Service
Type field are checked.
Default none
Format
match [not] ip precedence
0-7
Mode Class-Map Config
Default none
Format
match [not] ip tos
tosbits tosmask
Mode Class-Map Config