Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 277)

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In this example, the configured ETS bandwidth allocation and scheduler behavior is as follows:

Unused

bandwidth

usage:

Normally, if there is no traffic or unused bandwidth for a priority group, the

bandwidth allocated to the group is distributed to the other priority groups

according to the bandwidth percentage allocated to each group. However, when

three priority groups with different bandwidth allocations are used on an interface:

• If priority group 3 has free bandwidth, it is distributed as follows: 20% of the free

bandwidth to priority group 1 and 30% of the free bandwidth to priority group 2.

• If priority group 1 or 2 has free bandwidth, (20 + 30)% of the free bandwidth is

distributed to priority group 3. Priority groups 1 and 2 retain whatever free

bandwidth remains up to the (20+ 30)%.

Strict-priority

groups:

If two priority groups have strict-priority scheduling, traffic assigned from the

priority group with the higher priority-queue number is scheduled first. However,

when three priority groups are used and two groups have strict-priority scheduling

(such as groups 1 and 3 in the example), the strict priority group whose traffic is

mapped to one queue takes precedence over the strict priority group whose traffic

is mapped to two queues.

Therefore, in this example, scheduling traffic to priority group 1 (mapped to one strict-priority queue)

takes precedence over scheduling traffic to priority group 3 (mapped to two strict-priority queues).

Configuring DCB Maps and its Attributes

This topic contains the following sections that describe how to configure a DCB map, apply the

configured DCB map to a port, configure PFC without a DCB map, and configure lossless queues. This

functionality is supported on the S6000 platform.

DCB Map: Configuration Procedure

A DCB map consists of PFC and ETS parameters. By default, PFC is not enabled on any 802.1p priority

and ETS allocates equal bandwidth to each priority. To configure user-defined PFC and ETS settings, you

must create a DCB map.

Step Task Command Command Mode

Enter global configuration mode to create a

DCB map or edit PFC and ETS settings.

dcb-map name

CONFIGURATION

Configure the PFC setting (on or off) and the

ETS bandwidth percentage allocated to traffic

in each priority group, or whether the priority

group traffic should be handled with strict

priority scheduling. You can enable PFC on a

maximum of two priority queues on an

interface. Enabling PFC for dot1p priorities

makes the corresponding port queue lossless.

The sum of all allocated bandwidth

percentages in all groups in the DCB map

must be 100%. Strict-priority traffic is serviced

first. Afterwards, bandwidth allocated to other

priority-group

group_num {bandwidth

percentage | strict-

priority} pfc {on | off}

DCB MAP

Data Center Bridging (DCB)

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