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QoS Features
Copyright © 2010, Juniper Networks, Inc.
Table 3: QoS Terminology (continued)
Term
Shared shaper
constituent
Weight
WRED
Table 4 on page 7 describes the major QoS features supported on the E Series router.
Table 4: QoS Features
Feature
Best effort
Differentiated services
Drop profile
Port shaping
QoS parameters
QoS port-type profile
QoS profile
Queue profile
Description
All nodes and queues that are associated with a logical interface
that is being shared shaped are considered potential constituents of
the shared shaper.
Specifies the relative weight for queues in the traffic class.
Weighted random early detection congestion avoidance technique.
Description
Default traffic class for packets being forwarded across the device.
Packets that are not assigned to a specific traffic class are assigned
to the best-effort traffic class.
Assured forwarding—See RFC 2597.
Expedited forwarding—See RFC 2598.
Template that specifies active queue management in the form of
WRED behavior of an egress queue.
Shapes the aggregate traffic through a port or channel to a rate that
is less than the line or port rate.
Creates a queuing architecture without the numeric subscriber rates
and weights in scheduler profiles. You then use the same QoS and
scheduler profiles across all subscribers who use the same services
but at different bandwidths, reducing the total number of QoS
profiles and scheduler profiles required.
QoS profile that is automatically attached to ports of the
corresponding type if you do not explicitly attach a QoS profile.
Collection of QoS commands that specify queue profiles, drop
profiles, scheduler profiles, and statistics profiles in combination
with interface types.
Template that specifies the buffering and tail-dropping behavior of
an egress queue.
Chapter 1: Quality of Service Overview
7
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Troubleshooting
