Cell-Based Atm Shaping; Fixed Classification - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Cell-Based ATM Shaping

Fixed Classification

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On ACX Series routers, policing is cell based and configured in the ingress path of the
ATM IMA pseudowire interface at the [
policing features are supported:
ATM Adaption Layer 5 (AAL5) pseudowires on which cell-based policing is performed
before packet assembly.
Per-ATM IMA channel policing.
Traffic classes—Constant bit rate (
variable bit rate ( nrtvbr ), and unspecified bit rate (
the and statements for the configuration to work. With the
peak-rate cdvt
statement, you can limit the maximum traffic allowed by specifying the largest number
of cells per second that the policer processes before it drops packets. The
statement ensures that the configuration functions correctly.
For nonconforming cells, the
atm-policer policer-name
bit-rate— nrtvbr and rtvbr
Cell-based ATM shaping uses cell-based queuing and scheduling to determine the
maximum amount of traffic that can be transmitted on an ATM IMA pseudowire.
Packet-based shaping is not supported. On ACX Series routers, ATM shaping is configured
in the egress path of the ATM IMA pseudowire interface at the [
hierarchy level. The following ATM shaping features are supported:
Prioritized bit rate—Constant bit rate (
bit rate— and
nrtvbr rtvbr
for Ethernet traffic.
Constant bit rate shaping—Constant bit rate (
limit the number of cells per second that the shaper processes before it drops packets.
Variable bit rate shaping—Variable bit rate shaping (
and .
sustained-rate
Unspecified bit rate—Unspecified bit rate (
priority.
The default shaping parameter is unspecified bit rate, which is similar to the best-effort
service for Ethernet traffic.
Fixed classifiers map all traffic on an interface to the forwarding class and loss priority.
The forwarding class determines the output queue. A scheduler uses the loss priority to
control packet discard during periods of congestion by associating different drop profiles
with different loss priorities. On ACX Series routers, the fixed classifier is associated with
the ingress interface. Packets are assigned on the basis of the type of fixed classification
associated with the logical interface. To configure a fixed classifier, include the
] hierarchy level. The following ATM
edit firewall
), real-time variable bit rate (
cbr
ubr
, , and
discard discard-tag
] hierarchy level. The
discard-tag
—traffic classes.
cbr ) is the highest priority, followed by variable
. Unspecified bit rate ( ) is similar to the best-effort service
ubr
) shaping uses the peak cell rate to
cbr
ubr ) uses
), non-real-time
rtvbr
). All traffic classes must include
peak-rate
cdvt
actions at the [
count edit firewall
action is applicable to variable
edit class-of-service
and ) uses
nrtvbr rtvbr peak-rate
peak-rate with the lowest transmit
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