Reference Guide

Octet Combination Supported <speed> Argument
Setting
portCfgShow Combo String portCfgShow Speed String
1 (32G|16G|8G|4G) 0 1 AN
4 4G
8 8G
16 16G
32 32G
2 (10G|8G|4G) 0 2 AN
4 4G
8 8G
10 10
The final speed achieved also depends on the SFP used.
Example 1: If ports 0-7 octet is set to combination 1, port 0 is set to "0" and 8G SFP inserted, it can negotiate only up to 8G; if
10G SFP is inserted, port will not go online as combination 1 does not support 10G.
Example 2: if ports 8-15 octet is set to combination 2, port 8 is set to "10" but 16G SFP inserted, the port will not go online as
the configured speed (10G) for that port is not supported by the SFP (16G|8G|4G).
Setting maximum auto-negotiated port speed
If you do not know exactly at what speed a new device will connect, but you want to ensure that nothing connects faster than a certain
speed, then you can configure the maximum auto-negotiated speed.
For example, if a port is configured with a maximum auto-negotiated speed of 16 Gbps, and the SFP is 32 Gbps, then the attempted
speed negotiations are 16 and 8 Gbps.
NOTE
A 32-Gbps optical transceiver in a Gen 6 device can only auto-negotiate to 32 Gbps, 16 Gbps, or 8 Gbps and a 16-Gbps
optical transceiver in a Gen 6 device can only auto-negotiate to 16 Gbps, 8 Gbps, or 4 Gbps; this capability is determined by the
speed of the optical transceiver at the other end of the link.
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the portCfgSpeed command with the -m option.
The following example sets the maximum auto-negotiated speed to 16 Gbps for port 3 on slot 2.
switch:admin> portcfgspeed 2/3 0 -m 16
Decoding fdmiShow command output
Prior to Fabric OS 7.4.0a, the fdmiShow command displays the hexadecimal data for all non-ASCII and non-WWN port attributes. This
required you to lookup the hexadecimal conversion data in the standardized specifications to decode the information. Starting with
Fabric OS 7.4.0a, the fdmiShow command automatically decodes certain hexadecimal port attribute data to ASCII format. However, if
you still need to view the data in hexadecimal format, you can use the fdmiShow -hexoutput command.
The following example highlights the difference in the fdmiShow command output:
sw0:admin> fdmishow
Local HBA database contains:
30:03:00:05:1e:0e:ee:b9
Ports: 1
Performing Advanced Configuration Tasks
Brocade Fabric OS Administration Guide, 8.0.1
86 53-1004111-02