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For information about configuring specific SONET/SDH statements, see "SONET/SDH
Interfaces Overview" on page 895.
Configuring ATM2 IQ VC Tunnel CoS Components
The ATM2 IQ interface allows multiple IP queues into each VC. On M Series routers
(except the M320 and M120 router), a VC tunnel can support four CoS queues. On
the M320, M120, and T Series routers for all ATM2 IQ PICs except the OC48 PIC, a
VC tunnel can support eight CoS queues. Within a VC tunnel, the WRR algorithm
schedules the cell transmission of each queue. You can configure the queue admission
policies, such as EPD or WRED, to control the queue size during congestion.
For information about CoS components that apply generally to all interfaces, see the
JUNOS Class of Service Configuration Guide.
To configure ATM2 IQ VC tunnel CoS components, include the following statements
at the
}
}
(z0-increment | no-z0-increment);
}
[edit interfaces at-fpc/pic/port]
[edit chassis fpc slot-number pic pic-number]
max-queues-per-interface number;
[edit interfaces at-fpc/pic/port]
atm-options {
linear-red-profiles profile-name {
high-plp-max-threshold percent;
low-plp-max-threshold percent;
queue-depth cells high-plp-threshold percent low-plp-threshold percent;
}
plp-to-clp;
scheduler-maps map-name {
forwarding-class class-name {
epd-threshold cells plp1 cells;
linear-red-profile profile-name;
priority (high | low);
transmit-weight (cells number | percent number);
}
vc-cos-mode (alternate | strict);
}
}
unit 0 {
atm-scheduler-map (map-name | default);
family family {
address address {
destination address;
}
}
plp-to-clp;
shaping {
(cbr rate | rtvbr peak rate sustained rate burst length | vbr peak rate sustained
rate burst length);
Chapter 13: Configuring ATM Interfaces
hierarchy level:
Configuring ATM2 IQ VC Tunnel CoS Components
347
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