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Fabric OS Administrator’s Guide

53-1001763-02

Trunking over long distance fabrics

4: 12->892 10:00:00:05:1e:46:42:01 3 deskew 15 MASTER
13->893 10:00:00:05:1e:46:42:01 3 deskew 15
Tx: Bandwidth 16.00Gbps, Throughput 1.67Gbps (12.12%)
Rx: Bandwidth 16.00Gbps, Throughput 1.66Gbps (12.11%)
Tx+Rx: Bandwidth 32.00Gbps, Throughput 3.33Gbps (12.11%)

Trunking over long distance fabrics

In long-distance fabrics, if a port speed is set to autonegotiate, then the maximum speed, which is
8 Gbps, is assumed for reserving buffers for the port. If the port is only running at 2 Gbps, this
wastes buffers. On the Brocade 300, 4100, 4900, 5100, 5300, 5410, 5424, 5450, 5480, 7800,
8000, VA-40FC, and 48000 platforms, for long-distance ports, you should specify the port speed
instead of setting it to autonegotiate.

Support for 8 Gbps is only between the following:

•

Between the Brocade 48000 and Brocade DCX (including DCX-4S) platforms with the
appropriate 8-Gbps blades

•

Between Brocade DCX (including DCX-4S) platforms with the appropriate 8-Gbps blades

•

Between Brocade 300, 5100, 5300, 5410, 5424, 5450, 5480, and VA-40FC switches with the
8 Gbps SFPs installed.

The Brocade 300, 5100, 5300, 5410, 5424, 5450, 5480, and VA-40FC support long-distance
modes L0, LE, LS, and LD. The distance supported on each platform depends on the available
buffers, number of back-end ports, and number of offline ports.

In addition to the criteria listed in

“Criteria for managing trunking connections”

on page 426,

observe the following criteria for trunking over extended fabrics:

•

It is supported only on switches running Fabric OS v6.1.0 and later.

•

Extended Fabrics and ISL Trunking licenses are required on all participating switches.

•

When configuring long distance, the portCfgLongDistance --vc_translation_link_init

parameter must be set the same on all ports in an extended fabric.

For additional information on configuring long distance, see