HP ProCurve 6400cl Series Management And Configuration Manual page 284

Port Traffic Controls
Guaranteed Minimum Bandwidth (GMB) on the Series 5300xl Switches
13-12
Syntax: [ no ] int < port-list > bandwidth-min output (Continued)
[ < queue1% > < queue2% > < queue3% > < queue4% >]
For ports in < port-list >, specifies the minimum outbound
bandwidth as a percent of the total bandwidth for each
outbound queue. The queues receive service in descending
order of priority. You must specify a bandwidth percent
value for all four queues, and the sum of the bandwidth
percentages must not exceed 100%. (0 is a value for a queue
percentage setting. See the Note, below.) Configuring a
total of less than 100% across the four queues results in
unallocated bandwidth that remains harmlessly unused
unless a given queue becomes oversubscribed. In this case,
the unallocated bandwidth is apportioned to
oversubscribed queues in descending order of priority. For
example, if you configure a minimum of 10% for queues
1 - 3, and 0% for queue 4, then the unallocated bandwidth
will be available to all four queues in the following
prioritized order:
1. Queue 4 (high priority)
2. Queue 3 (medium priority)
3. Queue 2 (normal priority)
4. Queue 1 (low priority)
A setting of 0 (zero %) on a queue means that no bandwidth
minimum is specifically reserved for that queue for each
of the ports in < port-list >. Also, there is no benefit to setting
the high-priority queue (queue 4) to 0 (zero) unless you
want the medium queue (queue 3) to be able to support
traffic bursts above its guaranteed minimum.
Notes: Configuring 0% for a queue can result in that
queue being starved if any higher queue becomes over-
subscribed and is then given all unused bandwidth.
The switch applies the bandwidth calculation to the link
speed the port is currently using. For example, if a 10/
100 Mbs port negotiates to 10 Mbps on the link, then it
bases its GMB calculations on 10 Mbps; not 100 Mbps.
Use show bandwidth output < port-list > to display the
current GMB configuration. (The show config and show
running commands do not include GMB configuration
data.)