Switches - Dell PowerConnect J-EX4200-24T Software Manual

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS
Table 363: Default Packet Header Rewrite Mappings (continued)
Map from Forwarding Class
best-effort
network-control
network-control
Related
Documentation
Understanding Port Shaping and Queue Shaping for CoS on J-EX Series Switches
Port Shaping
Queue Shaping
Related
Documentation
2878
PLP Value
high
low
high
Understanding Junos OS CoS Components for J-EX Series Switches on page 2862
Example: Configuring CoS on J-EX Series Switches on page 2883
Defining CoS Rewrite Rules (CLI Procedure) on page 2925
Defining CoS Rewrite Rules (J-Web Procedure) on page 2926
If the amount of traffic on a switch's network interface is more than the maximum
bandwidth allowed on the interface, it leads to congestion. Port shaping and queue
shaping can be used to manage the excess traffic and avoid congestion. Port shaping
defines the maximum bandwidth allocated to a port, while queue shaping defines a limit
on excess-bandwidth usage per queue.
This topic covers:
Port Shaping on page 2878
Queue Shaping on page 2878
Port shaping enables you to shape the aggregate traffic through a port or channel to a
rate that is less than the line or port rate.
Queue shaping throttles the rate at which queues transmit packets. For example, using
queue shaping, you can rate-limit a strict-priority queue so that the strict-priority queue
does not lock out (or starve) low-priority queues. Similarly, for any queue, you can
configure queue shaping.
Understanding CoS Schedulers on page 2873
Defining CoS Schedulers (CLI Procedure) on page 2920
Map to DSCP/IEEE 802.1p/IP Precedence
Value
be
nc1/cs6
nc2/cs7