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Configuring buffer sharing on fcx and icx devices, Fcx buffer sharing levels – Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide User Manual

Page 57

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Field definitions for the output of show qd-buffer-profile command

TABLE 12

Field

Description

User Buffer Profile

The name of the user-configurable buffer profile

Port-type

The type of the port: 1 Gbps or 10 Gbps or All

Total Buffers

The total number of buffers allocated to the port

Total Descriptors

The total number of descriptors allocated to the port

Per Queue details

The names of the queues

Buffers

The total number of buffers allocated to the queue

Descriptors

The total number of descriptors allocated to the queue

Configuring buffer sharing on FCX and ICX devices

Network congestion can be caused by various reasons such as port shaping, flow control received on
the link due to congestion on the peer, or oversubscription of the egress line rate.

To support priority queuing, FCX and ICX devices support a configurable amount of guaranteed buffers
and descriptors per (port, queue) pair. For information about guaranteed buffers and descriptors, refer
to

Configuring buffer profiles

on page 49.

In addition, FCX and ICX devices support configurable shared buffer pools, which help absorb traffic
bursts without packet loss. For a given (port, queue) pair, if its buffer usage exceeds the guaranteed
limit, it will start using buffers in the sharing pool. The shared buffers are apportioned among the 1
Gbps, 10 Gbps, 16 Gbps, and stacking ports.

Buffer sharing is always enabled. You can configure buffer sharing by changing the buffer sharing level.
To configure the buffer sharing level, enter a command similar to the following.

device(config)# qd-share-level 2

Syntax: qd-share-level level

The level variable is the buffer sharing level, which is a decimal valu levele. The range of valid values
for FCX is from 1 to 8. The range of valid values for an ICX 6610 is from 2 through 8.

For descriptions of the buffer sharing levels for FCX devices, refer to

FCX buffer sharing levels

on page

57.

For descriptions of the buffer sharing levels for ICX 6610 devices, refer to

ICX 6610 buffer sharing

levels

on page 58.

For descriptions of the buffer sharing levels for ICX 6430 and 6450 devices, refer to

ICX 6430 and ICX

6450 buffer sharing levels

on page 59.

FCX buffer sharing levels

The FCX buffer sharing level configures the shared buffers on the device. The following table defines
the FCX buffer sharing level settings. For information about configuring buffer sharing, refer to

Configuring buffer sharing on FCX and ICX devices

on page 57.

Configuring buffer sharing on FCX and ICX devices

FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide

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