Port Traffic Controls
Guaranteed Minimum Bandwidth (GMB)
Note For more information on queue configuration and the associated default
minimum bandwidth settings, refer to the chapter titled “Quality of Service
(QoS): Managing Bandwidth More Effectively” in the Advanced Traffic
Management Guide for your switch.
Configuring Guaranteed Minimum Bandwidth for
Outbound Traffic
For any port or group of ports you can configure either the default minimum
bandwidth settings for each outbound priority queue or a customized band-
width allocation. For most applications, ProCurve recommends configuring
GMB with the same values on all ports on the switch so that the outbound
traffic profile is consistent for all outbound traffic. However, there may be
instances where it may be advantageous to configure special profiles on
connections to servers or to the network infrastructure (such as links to
routers, other switches, or to the network core).
Syntax: [ no ] int < port-list > bandwidth-min output
Configures the default minimum bandwidth allocation for
the outbound priority queue for each port in < port-list >.
The default values per priority queue are:
• Queue 1 (low priority): 2%
• Queue 2 (low priority): 3%
• Queue 3 (normal priority): 30%
• Queue 4 (normal priority): 10%
• Queue 5 (medium priority): 10%
• Queue 6 (medium priority): 10%
• Queue 7 (high priority): 15%
• Queue 8 (high priority): 20%
The no form of the command disables GMB for all ports in
< port-list >. In this state, which is the equivalent of setting
all outbound queues on a port to 0 (zero), a high level of
higher-priority traffic can starve lower-priority queues,
which can slow or halt lower-priority traffic in the
network. You can configure bandwidth minimums from
either the global configuration level (as shown above) or
from the port context level. For information on outbound
port queues, refer to table 13-1, “Per-Port Outbound
Priority Queues” on page 13-19.
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