Configuring Enhanced Transmission Selection; Ets Prerequisites And Restrictions - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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DCB and Switch Stacking Caveats for the S4820T

The following is a list of behaviors and limitations regarding the use of DCB over S4820T ports involved

in switch stacking:

You can enable DCB only on 40 Gig (QSPF+) ports.

DCB is not supported over any of the 48 RJ-45 10 Gig ports while they are configured in stacking

You cannot configure stacking on any of the 48 RJ-45 10 Gig ports, if DCB is enabled on any of the 40

Gig stacking ports.

If DCB is enabled, it will disable the ability to use any of the 48 10 Gig ports for stacking.

Configuring Enhanced Transmission Selection

Enhanced transmission selection (ETS) provides a way to optimize bandwidth allocation to outbound

802.1p classes of converged Ethernet traffic. Different traffic types have different service needs. Using

ETS, you can create groups within an 802.1p priority class to configure different treatment for traffic with

different bandwidth, latency, and best-effort needs.

For example, storage traffic is sensitive to frame loss; interprocess communication (IPC) traffic is

latency-sensitive. ETS allows different traffic types to coexist without interruption in the same converged

Allocating a guaranteed share of bandwidth to each priority group

Allowing each group to exceed its minimum guaranteed bandwidth if another group is not fully using

its allotted bandwidth

To configure ETS and apply an ETS output policy to an interface, you must:

1. Create a QoS output policy with ETS scheduling and bandwidth allocation settings.

2. Create a priority group of 802.1p traffic classes.

3. Configure a DCB output policy in which you associate a priority group with a QoS ETS output policy.

4. Apply the DCB output policy to an interface.

The following prerequisites and restrictions apply when you configure ETS bandwidth allocation or queue

scheduling and apply a QoS ETS output policy on an interface:

Configuring ETS bandwidth allocation or a queue scheduler for dot1p priorities in a priority group is

applicable if the DCBx version used on a port is CIN (refer to

CEE as a port version where CNA supports CEE and DUT port versions in AUTO or CEE mode.

Configuring DCBx on an

Data Center Bridging (DCB) | 313

Interface) or