RTS DV-3400 Informações Técnicas descarregar pdf (Página 341)

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Port Traffic Controls

Guaranteed Minimum Bandwidth (GMB) on the Series 5300xl Switches

Note For a given port, when the demand on one or more outbound queues exceeds

the minimum bandwidth configured for those queues, the switch apportions

unallocated bandwidth to these queues on a priority basis. As a result, speci-

fying a minimum bandwidth for a high-priority queue but not specifying a

minimum for lower-priority queues can starve the lower-priority queues dur-

ing periods of high demand on the high priority queue. For example, if a port

configured to allocate a minimum bandwidth of 80% for outbound high-

priority traffic experiences a demand above this minimum, then this burst

starves lower-priority queues that do not have a minimum configured.

Normally, this will not altogether halt lower priority traffic on the network,

but will likely cause delays in the delivery of the lower-priority traffic.

The sum of the GMB settings for all four outbound queues on a given port

cannot exceed 100%.

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 minimum bandwidth allocation for the

outbound priority queue for each port in < port-list >. The

default values are:

• Queue 1 (low priority): 8%

• Queue 2 (normal or unmarked priority): 16%

• Queue 3 (medium priority): 30%

• Queue 4 (high priority): 45%

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 14-1, “Per-Port Outbound

Priority Queues” on page 14-22.

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