}
}
CoS supports one global system default classifier of the EXP type, as shown in the
following example:
[edit class-of-service]
{
system-defaults {
classifiers {
exp exp-classf-core;
}
}
}
•
All packets that are received on a logical interface in the ingress direction can be
classified to a single forwarding class using fixed classification.
•
BA Classification based on the following packet fields is supported at the logical
interface level:
•
IPv4 - inet-precedence
•
DSCP
The following is the configuration stanza for defining BA classifiers:
[edit class-of-service]
classifiers {
(inet-precedence|dscp ) classifier-name
{
forwarding-class class-name loss-priority [low | high]
code-points ([ aliases ] | [ dscp-bits ]);
}
•
Queuing and scheduling functionalities comprise the following parameters:
•
Transmit rate per queue
•
Shaping rate per queue
•
WRED
•
Forwarding classes. A maximum of 4 forwarding classes can be defined for PPP
interfaces.
•
The four priorities supported for logical interface-level queuing are strict-high,
medium-high, medium-low, or low. The transmit rate per queue (CIR) is the minimum
committed rate can be specified for each queue. The shaping rate per queue (PIR) is
the maximum transmit rate can be specified for each queue. For WRED, the default
behavior is to enable tail drops. The drop profile configuration enables WRED and
enables different drop behavior based on the drop precedence to be entered. Loss
priority settings help determine which packets are dropped from the network during
periods of congestion. The software supports multiple packet loss priority (PLP)
designations: low and high
•
Buffer-size can be specific in percentage and temporal configuration. This size is turned
into the number of packets per queue, with 256 bytes treated as the average packet
size. The following settings can be configured at the queue level:
Copyright © 2017, Juniper Networks, Inc.882
ACX Series Universal Access Router Configuration Guide
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