Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 241)

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interface type slot/port

2. Configure the port queues that will still function as no-drop queues for lossless traffic.

INTERFACE mode

pfc no-drop queues queue-range

For the dot1p-queue assignments, refer to the dot1p Priority-Queue Assignment table.

The maximum number of lossless queues globally supported on the switch is two.

The range is from 0 to 7. Separate the queue values with a comma; specify a priority range with a

dash; for example, pfc no-drop queues 1,7 or pfc no-drop queues 2-7.

The range is from 0 to 3. Separate the queue values with a comma; specify a priority range with a

dash; for example, pfc no-drop queues 1,3 or pfc no-drop queues 2-3.

The default: No lossless queues are configured.

NOTE: Dell Networking OS Behavior: By default, no lossless queues are configured on a port.

A limit of two lossless queues is supported on a port. If the amount of priority traffic that you configure to

be paused exceeds the two lossless queues, an error message displays. Reconfigure the input policy

using a smaller number of PFC priorities.

If you configure lossless queues on an interface that already has a DCB input policy with PFC enabled

(pfc mode on), an error message displays.

Traffic may be interrupted due to an interface flap (going down and coming up) when you reconfigure

lossless queues on no-drop priorities in an input policy and re-apply the policy to an interface.

In S6000, any pfc-dot1p priorities configured on a given interface need not be the same across the

system. In other words, lossless queue limit is applicable on a per-port level and not on the global-config

context. For example, one of the Te/Fo interfaces can have pfc-dot1p priorities as 2 and 3. Whereas, the

other Te/Fo interface(s) can have its pfc-dot1p priorities as 4 and 5.

It is the user responsibility to have symmetric PFC configurations on the interfaces involved in a particular

PFC-enabled traffic-flow to obtain lossless behavior

Configuring the PFC Buffer in a Switch Stack

In a switch stack, you must configure all stacked ports with the same PFC configuration. In addition, you

must configure a separate buffer of memory allocated exclusively to a service pool accessed by queues

on which priority-based control flows are mapped.

These PFC-enabled queues ensure the lossless transmission of storage and server traffic. The buffer

required for the PFC service pool is calculated based on the number of ports and port queues used by

PFC traffic.

You can configure the size of the PFC buffer for all switches in a stack or all port pipes on a specified

stack unit by entering the following commands on the master switch.

• Configure the PFC buffer for all switches in the stack.

CONFIGURATION mode

[no] dcb stack-unit all pfc-buffering pfc-port {1-64} pfc-queues {1-2}

Data Center Bridging (DCB)

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