Packets belonging to the yellow class have already
been marked by a classifier with medium-low or medium-high PLP. The
marking policer can leave the packet’s PLP unchanged or increase
the PLP to high. Therefore, these packets are metered against the
PIR only.
For example, if a BA or MF classifier marks a packet
with medium-high PLP according to the ToS bits in the IP header, and
the two-rate TCM policer is in color-aware mode, the output loss priority
is as follows:
If the rate of traffic flow is less than the CIR, packets
remain marked as medium-high PLP.
If the rate of traffic flow is greater than the CIR but
less than the PIR, packets remain marked as medium-high PLP.
If the rate of traffic flow is greater than the PIR, some
of the packets are marked as high PLP, and some of the packets remain
marked as medium-high PLP.
