Table 18: Operational Shaping Modes For The E120 Router And E320; Guidelines For Configuring Qos Over Atm - Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual

JUNOSe 11.1.x Quality of Service Configuration Guide
Table 18: Operational Shaping Modes for the E120 Router and E320 Router
Related Topics

Guidelines for Configuring QoS over ATM

This section provides general QoS configuration guidelines for ATM line modules.
These guidelines are applicable to all JUNOSe releases.
The SAR scheduler generates VC backpressure as a way to control the flow of packets
from the HRR scheduler to the SAR scheduler. The QoS port modes control integration
of the two schedulers.
In default integrated mode, each VC queue in the SAR generates backpressure for
the ATM VC node in the default traffic class group in the HRR. The backpressure
throttles the dequeue rate of the ATM VC node and the nodes and queues stacked
above it in the scheduler hierarchy. VC backpressure is disabled in low-latency QoS
port mode and low-cdv QoS port mode.
166
Guidelines for Configuring QoS over ATM
qos-mode-port
qos-shaping-mode for Specific
Rule for specific port Port
Rule Cell low-cdv
1
Frame low-latency or
none
Rule No shaping mode low-cdv
2
Rule No shaping mode low-latency or
3 none
No shaping mode low-latency or
none
Rule No shaping mode low-latency or
4 none
No shaping mode low-latency or
none
Guidelines for Configuring QoS over ATM on page 166
Configuring Default Integrated Mode for ATM Interface on page 168
Configuring Low-Latency Mode for Per-Port Queuing on ATM Interfaces on
page 169
Configuring Low-CDV Mode for Per-Port Queuing on ATM Interfaces on page 171
Configuring the QoS Shaping Mode for ATM Interfaces on page 174
qos-shaping-mode qos-mode-port
for Port 0 for Port 0
Any Any
Any Any
Any Any
Frame Any
Cell Any
No shaping mode low-cdv
No shaping mode low-latency or
none
Operational
Shaping
Mode for
Specific
Port
Cell
Frame
Cell
Frame
Cell
Cell
Frame