Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

Page: 197 / 398

Table 17: Operational Shaping Modes for ERX7xx Models, ERX14xx Models, and the
ERX310 Router
Operational
Shaping Mode for
the Specific Port
qos-mode-port
for Port 0 qos-shaping-mode
for Port 0 qos-shaping-mode
for the Specific Port
Rule
Cell low-cdv Cell Cell Rule
1
Frame low-latency or none Frame Frame
Cell low-cdv Cell No shaping mode Rule
2
Frame low-latency or none Frame No shaping mode
Cell low-cdv No shaping mode No shaping mode Rule
3
Frame low-latency or none No shaping mode No shaping mode
E120 Router and E320 Router
The E120 router and the E320 router use an operational shaping mode that is based
on the following two commands:
■
The QoS shaping mode you set with the qos-shaping-mode command on port
0 and on the specific port
■
The port queuing mode you set with the qos-mode-port command on port 0
and on the specific port
The E120 and E320 routers use the following rules to determine the operational
shaping mode used for a port:
1.
If the specific port has a QoS shaping mode configured, the operational shaping
mode for that port is the same as the QoS shaping mode.
2.
If the specific port has no QoS shaping mode and a port queuing mode of low-cdv
configured, the operational shaping mode is cell.
3.
If the specific port has no QoS shaping mode and no queuing mode configured,
the operational shaping mode for that port is the same as the port 0 QoS shaping
mode.
4.
If both the specific port and port 0 have no QoS shaping mode configured, the
operational shaping mode is based on the port 0 queuing mode. If the port 0
queuing mode (set by the
qos-mode-port command) is low-cdv, the operational
shaping mode is cell; otherwise the operational shaping mode is frame.
Table 18 on page 166 lists the possible combinations of the two commands and the
resultant operational shaping mode.
Per-Packet Queuing on the SAR Scheduler Overview
■ 165
Chapter 19: Configuring an Integrated Scheduler to Provide QoS for ATM