Strict-Priority Queueing; Weighted Random Early Detection - Dell Force10 C150 Configuration Manual

Strict-priority Queueing

You can assign strict-priority to one unicast queue, 1-7, using the command
CONFIGURATION mode. Strict-priority means that FTOS dequeues all packets from the assigned queue
before servicing any other queues.
strict-priority
• The
• A queue with strict-priority can starve other queues in the same port-pipe.
• On the E-Series, this configuration is applied to the queue on both ingress and egress.

Weighted Random Early Detection

Weighted Random Early Detection
Weighted Random Early Detection (WRED) congestion avoidance mechanism that drops packets to
prevent buffering resources from being consumed.
Traffic is a mixture of various kinds of packets. The rate at which some types of packets arrive might be
greater than others. In this case, the space on the BTM (ingress or egress) can be consumed by only one or
a few types of traffic, leaving no space for other types. A WRED profile can be applied to a policy-map so
that specified traffic can be prevented from consuming too much of the BTM resources.
WRED uses a profile to specify minimum and maximum threshold values. The minimum threshold is the
allotted buffer space for specified traffic, for example 1000KB on egress. If the 1000KB is consumed,
packets will be dropped randomly at an exponential rate until the maximum threshold is reached
(Figure 41-13); this is the "early detection" part of WRED. If the maximum threshold—2000KB, for
example—is reached, then all incoming packets are dropped until less than 2000KB of buffer space is
consumed by the specified traffic.
Figure 41-13. Packet Drop Rate for WREDl
All Pckts
0 Pckts
0KB
870 | Quality of Service
bandwidth-percentage
supersedes
is supported only on platform
Total Buffer Space
Min Max
Buffer Space
bandwidth-weight
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strict-priority
from
percentage configurations.
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