Multifield Classification Used In Conjunction With Policers - Juniper EX9200 Features Manual

Traffic Policers Feature Guide for EX9200 Switches

Multifield Classification Used In Conjunction with Policers

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BA classification purposes can be the Differentiated Services code point (DSCP) value,
DSCP IPv6 value, IP precedence value, MPLS EXP bits, and IEEE 802.1p value. The
default classifier is based on the IP precedence value.
Multifield classification refers to a method of packet classification that uses a standard
stateless firewall filter configuration to set the forwarding class or PLP for each packet
entering or exiting the interface based on multiple fields in the IP packet header, including
the DSCP value (for IPv4 only), the IP precedence value, the MPLS EXP bits, and the
IEEE 802.1p bits. Multifield classification commonly matches on IP address fields, the
IP protocol type field, or the port number in the UDP or TCP pseudoheader field.
Multifield classification is used instead of BA classification when you need to classify
packets based on information in the packet information other than the CoS values
only.
With multifield classification, a firewall filter term can specify the packet classification
actions for matching packets though the use of the
loss-priority (high | medium-high | medium-low | low)
term's clause.
then
NOTE: BA classification of a packet can be overridden by the stateless firewall
filter actions
forwarding-class
To configure multifield classification in conjunction with rate limiting, a firewall filter term
can specify the packet classification actions for matching packets through the use of a
policer nonterminating action that references a single-rate two-color policer.
When multifield classification is configured to perform classification through a policer,
the filter-matched packets in the traffic flow are rate-limited to the policer-specified
traffic limits. Packets in a conforming flow of filter-matched packets are implicitly set to
a PLP. Packets in a nonconforming traffic flow can be discarded, or the packets can
low
be set to a specified forwarding class, set to a specified PLP level, or both, depending on
the type of policer and how the policer is configured to handle nonconforming traffic.
forwarding-class class-name
nonterminating actions in the
and .
loss-priority
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