Juniper EX9200 Features Manual page 140

Traffic Policers Feature Guide for EX9200 Switches
Overview
122
b. Make sure that the output queues to which the forwarding classes are assigned
are associated with schedulers. A scheduler defines the amount of interface
bandwidth assigned to the queue, the size of the memory buffer allocated for
storing packets, the priority of the queue, and the random early detection (RED)
drop profiles associated with the queue.
You configure output queue schedulers at the
hierarchy level.
You associate output queue schedulers with forwarding classes by means of a
scheduler map that you configure at the
map-name] hierarchy level.
c. Make sure that output-queue scheduling is applied to the physical interface
.
ge-1/2/0
You apply a scheduler map to a physical interface at the
interfaces ge-1/2/0 scheduler-map map-name]
In this example, you apply multifield classification to the input IPv4 traffic at a logical
interface by using stateless firewall filter actions and two firewall filter policers that are
referenced from the firewall filter. Based on the source address field, packets are either
set to the loss priority or else policed. Neither of the policers discards nonconforming
low
traffic. Packets in nonconforming flows are marked for a specific forwarding class
( expedited-forwarding or assured-forwarding
transmitted.
NOTE: Single-rate two-color policers always transmit packets in a conforming
traffic flow after implicitly setting a
Topology
In this example, you apply multifield classification to the IPv4 traffic on logical interface
. The classification rules are specified in the IPv4 stateless firewall filter
ge-1/2/0.0
mfc-filter and two single-rate two-color policers,
The IPv4 standard stateless firewall filter
—The first filter term matches packets with the source address 10.1.1.0/24
isp1-customers
or 10.1.2.0/24. Matched packets are assigned to the
class and set to the low
—The second filter term matches packets with the source address
isp2-customers
10.1.3.0/24 or 10.1.4.0/24. Matched packets are passed to
rate-limits traffic to a bandwidth limit of 300 Kbps with a burst-size limit of 50 KB.
This policer specifies that packets in a nonconforming flow are marked for the
forwarding class and set to the
expedited-forwarding
[edit class-of-service scheduler-maps
), set to a specific loss priority, and then
loss priority.
low
ef-policer
defines three filter terms:
mfc-filter
loss priority.
[edit class-of-service schedulers]
[edit class-of-service
hierarchy level.
and af-policer .
forwarding
expedited-forwarding
, a policer that
ef-policer
loss priority.
high
Copyright © 2016, Juniper Networks, Inc.