HP StorageWorks Fabric OS 6.x administrator guide (5697-7344, March 2008)

382 Administering ISL Trunking
Setting port speeds
For long-distance ports, if a port is set to autonegotiate port speed, the maximum speed (which is 4 Gbps)
is assumed for reserving buffers for the port–this wastes buffers if the port is actually running at 2 Gbps. For
long-distance ports, it is best to set the port speed (this applies to the 4/32 SAN Switch, 4/32B SAN
Switch and the 4/256 SAN Director only).
IMPORTANT: 8 Gbps is only supported between 4/256 SAN Directors-to-DC Directors or between DC
Director-to-DC Directors with the appropriate blades and 8 Gbps supported SFPs installed.
You can set the port speed for one port or for an entire switch. Trunked ports must be set to the same
speed.
To set the speed for one port:
1. Connect to the switch and log in as admin.
2. Enter the portCfgSpeed command. The format is:
portcfgspeed [slotnumber/]portnumber, speed_level
The following example sets the speed for port 3 on slot 2 to two Gbps:
switch:admin> portcfgspeed 2/3 2
done.
switch:admin>
The following example sets the speed for port 3 on slot 2 to autonegotiate:
switch:admin> portcfgspeed 2/3 0
done.
switch:admin>
To set the same speed for all ports on the switch:
1. Connect to the switch and log in as admin.
2. Enter the switchCfgSpeed command. The format is:
switchcfgspeed speedlevel
slotnumber For bladed systems only, specify the slot number of the port to be configured,
followed by a slash (/). This operand is only required for Brocade directors.
portnumber Specifies the port number relative to its slot for bladed systems.
speedlevel Specifies the speed of the link:
• 0—Autonegotiating mode. The port automatically configures for the
highest speed.
• 1—one Gbps mode. Fixes the port at a speed of one Gbps. Changing the
speed to one Gbps causes the port to be excluded from the trunk group.
• 2—two Gbps mode. Fixes the port at a speed of two Gbps.
• 4—four Gbps mode. Fixes the port at a speed of four Gbps. (HP
StorageWorks 4/8 SAN Switch, 4/16 SAN Switch, Brocade 4Gb SAN
Switch for HP p-Class BladeSystem, Brocade 4Gb SAN Switch for HP
c-Class BladeSystem, SAN Switch 4/32, 4/64 SAN Switch, SAN Switch
4/32B, 400 Multi-protocol Router and 4/256 SAN Director only)
• 8—eight Gbps mode. Fixes the port at a speed of four Gbps. (4/256 SAN
Director and DC Directors with supported blades and 8 Gbps SFPs
installed only.)