Foundry Configuration Guide for the FESX, FSX, and FWSX
13 - 12 © Foundry Networks, Inc. December 22, 2005
Foundry device schedules traffic in queue 7 and queue 6 first, based on the strict priority queueing method. When
there is no traffic in queue 7 and queue 6, the device schedules the other queues in round-robin fashion from the
highest priority queue to the lowest priority queue.
By default, when you specify the combined SP and WRR queuing method, the system balances the traffic among
the queues as shown in Table 2. If desired, you can change the default bandwidth values as instructed in the
section “Changing the Bandwidth Allocations” on page 13-14.
Selecting the QoS Queuing Method
FastIron devices use the weighted fair queuing method of packet prioritization by default. To change the method to
strict priority or back to weighted fair queuing, enter the following command at the Global CONFIG level of the CLI:
FESX424 Router(config)# qos mechanism strict
To change the method back to weighted round robin, enter the following command:
FESX424 Router(config)# qos mechanism weighted
Syntax: [no] qos mechanism strict | weighted
NOTE: The following combined method is supported in releases 02.2.00 and later.
To change the queuing mechanism to the combined SP and WRR method, enter the following command at the
Global CONFIG level of the CLI:
FESX424 Switch(config)#qos mechanism mixed-sp-wrr
Syntax: mechanism mixed-sp-wrr
Configuring the QoS Queues
Each of the queues has the following configurable parameters:
• The queue name
• The minimum percentage of a port’s outbound bandwidth guaranteed to the queue
Renaming the Queues
The default queue names on FESX, FSX, and FWSX devices are qosp7, qosp6, qosp5, qosp4, qosp3, qosp2,
qosp1, and qosp0. You can change one or more of the names if desired.
To rename queue qosp3 to “92-octane”, enter the following commands:
FESX424 Router(config)# qos name qosp3 92-octane
Table 2: Default Bandwidth for Combined SP and WRR Queueing Methods
Queue Default Bandwidth
qosp7 Strict priority (highest priority)
qosp6 Strict priority
qosp5 25%
qosp4 15%
qosp3 15%
qosp2 15%
qosp1 15%
qosp0 15% (lowest priority)
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