Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 244)

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4. Exit DCB Output Policy Configuration mode.

POLICY-MAP-OUT-ETS mode

exit

Dell Networking OS Behavior: Traffic in priority groups is assigned to strict-queue or WERR scheduling in

an DCB output policy and is managed using the ETS bandwidth-assignment algorithm. Dell Networking

OS deqeues all frames of strict-priority traffic before servicing any other queues. A queue with strict-

priority traffic can starve other queues in the same port.

ETS-assigned bandwidth allocation and scheduling apply only to data queues, not to control queues.

Dell Networking OS supports hierarchical scheduling on an interface. Dell Networking OS control traffic

is redirected to control queues as higher priority traffic with strict-priority scheduling. After control

queues drain out, the remaining data traffic is scheduled to queues according to the bandwidth and

scheduler configuration in the DCB output policy. The available bandwidth (that the ETS algorithm

calculates) is equal to the link bandwidth after scheduling non-ETS higher-priority traffic.

The configuration of bandwidth allocation and strict-queue scheduling is not supported at the same time

for a priority group. If both are configured, the configured bandwidth allocation is ignored for priority-

group traffic when you apply the output policy on an interface (refer to Applying an ETS Output Policy for

a Priority Group to an Interface).

Bandwidth assignment in a dot.1p priority-queue: By default, equal bandwidth is assigned to each port

queue and each dot1p priority in a priority group. To configure bandwidth amounts in associated dot1p

queues, use the bandwidth-percentage command. When specified bandwidth is assigned to some

port queues and not to others, the remaining bandwidth (100% minus assigned bandwidth amount) is

equally distributed to unassigned nonstrict priority queues in the priority group. The sum of the allocated

bandwidth to all queues in a priority group should be 100% of the bandwidth on the link.

Bandwidth assignment in a priority group: By default, equal bandwidth is assigned to each priority group

in the DCB output policy applied to an egress port if you did not configure bandwidth allocation. The sum

of configured bandwidth allocation to dot1p priority traffic in all ETS priority groups must be 100%.

Allocate at least 1% of the total bandwidth to each priority group and queue. If you assign bandwidth to

some priority groups but not to others, the remaining bandwidth (100% minus assigned bandwidth

amount) is equally distributed to non strict-priority groups which have no configured scheduler.

Scheduling of priority traffic: dot1p priority traffic on the switch is scheduled to the current queue

mapping. dot1p priorities within the same queue should have the same traffic properties and scheduling

method.

DCB output-policy error: If an error occurs in an DCB output-policy configuration, the configuration is

ignored and the scheduler and bandwidth allocation settings are reset to the ETS default values (all

priorities are in the same ETS priority group and bandwidth is allocated equally to each priority). If an error

occurs when a port receives a peer’s ETS configuration, the port’s configuration is reset to the previously

configured DCB output policy. If no DCB output policy was previously applied, the port is reset to the

default ETS parameters.

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