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Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring QoS (Rev. 03)
Overview
© 2008 Foundry Networks, Inc.
Page 40 of 62
| 3|128(100%)| 64( 50%)|
| 4|128(100%)|128(100%)|
| 5|128(100%)|128(100%)|
| 6|128(100%)|128(100%)|
| 7|128(100%)|128(100%)|
+==+=========+=========+
queue-set 2
-----------
+==+=========+=========+
|Pr| Green | Yellow |
+--+---------+---------+
| 0|128(100%)|128(100%)|
| 1|128(100%)|128(100%)|
| 2|128(100%)|128(100%)|
| 3|128(100%)|128(100%)|
| 4|128(100%)|128(100%)|
| 5|128(100%)|128(100%)|
| 6|128(100%)|128(100%)|
| 7|128(100%)|128(100%)|
+==+=========+=========+
queue-set 3
-----------
+==+=========+=========+
|Pr| Green | Yellow |
+--+---------+---------+
| 0|128(100%)|128(100%)|
| 1|128(100%)|128(100%)|
| 2|128(100%)|128(100%)|
| 3|128(100%)|128(100%)|
| 4|128(100%)|128(100%)|
| 5|128(100%)| 96( 75%)|
| 6|128(100%)|128(100%)|
| 7|128(100%)|128(100%)|
Setting the Random Detect Profile
The
qos tx queue-set random-detect
command, in Global Configuration mode, sets the profile
parameters to be used in the Weighted Random Early Detection (WRED) calculations. The
no
form of the command removes the WRED profile.
WRED is a congestion avoidance mechanism that slows traffic by randomly dropping packets
when there congestion impends. WRED is effective only with protocols such as TCP that respond
to dropped packets by decreasing the transmission rate.
NOTE
The three profiles that can be set are shared by the tail-drop and WRED
algorithms. Therefore, for all the congestion avoidance mechanisms together, the
user can set only three profiles.
The default profiles are available in
Table 8.
By default, the exponential weight factor is 9.
Command Syntax
device-name
(config)#
qos tx queue-set
<
profile
>
random-detect priority
<
priority
>
<
green-threshold-min
> <
green-max-prob
>
<
yellow-threshold-min
>
<
yellow-max-prob
>
[
exponential-weighting-constant
<
exponent
>]