Introduction To Configuring Policers; Guidelines For Applying Traffic Policers - Juniper EX9200 Features Manual

CHAPTER 3

Introduction to Configuring Policers

Guidelines for Applying Traffic Policers

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Copyright © 2016, Juniper Networks, Inc.
Guidelines for Applying Traffic Policers on page 15
The following general guidelines pertain to applying traffic policers:
Only one type of policer can be applied to the input or output of the same physical or
logical interface. For example, you are not allowed to apply a policer and a hierarchical
policer in the same direction at the same logical interface.
Chaining of policers—that is, applying policers to both a port and the logical interfaces
of that port—is not allowed.
A maximum of 64 policers is supported per physical or logical interface, provided no
behavior aggregate (BA) classification—traffic classification based on CoS values in
the packet headers—is applied to the logical interface.
The policer should be independent of BA classification. Without BA classification, all
traffic on an interface is treated either as expedited forwarding (EF) or non-EF, based
on the configuration. With BA classification, a physical or logical interface can support
up to 64 policers. The interface might be a physical interface or logical interface.
With BA classification, the miscellaneous traffic (the traffic not matching any of the
BA classification DSCP/EXP bits) is policed as non-EF traffic. No separate policers are
installed for this traffic.
Policers can be applied to unicast packets only. For information about configuring a
filter for flooded traffic, see Applying Forwarding Table Filters.
Two-Color Policer Configuration Overview on page 49
Three-Color Policer Configuration Overview on page 145
Hierarchical Policer Configuration Overview
15