Technical data

5-2 Fabric OS Administrator’s Guide
Publication Number: 53-0000518-09
Identifying Ports
5
In the SilkWorm 24000 and 48000 default configuration, all the ports are part of a single logical switch.
With Fabric OS v4.4.0 and later, you can configure the SilkWorm 24000 as two logical switches
(domains).
The following sections tell how to identify ports on SilkWorm 12000, 24000, and 48000 models, and
how to identify ports for zoning commands.
By Slot and Port Number
The port number is a number assigned to an external port to give it a unique identifier in a switch.
To select a specific port in the SilkWorm 12000, 24000, and 48000 models, you must identify both the
slot number and the port number using the format slot number/port number. No spaces are allowed
between the slot number, the slash (/), and the port number.
The following example shows how to enable port 4 on a blade in slot 2:
By Port Area ID
Zoning commands require that you specify ports using the area ID method. In Fabric OS v4.0.0 and
later, each port on a particular domain is given a unique area ID. The relationship between the port
number and area ID depends upon the PID format used in the fabric:
• When Core PID format is in effect, the area ID for port 0 is 0, for port 1, it is 1 and so forth.
When using Core PID mode on the SilkWorm 12000 (two logical 64-port switches), SilkWorm
48000 (one domain only), and the SilkWorm 24000 configured with two domains, the area IDs for
both logical switches (domains) range from 0 to 63. This means that both logical switch 0 and
logical switch 1 have a port that is referenced with area ID 0.
For 32-port blades in the SilkWorm 48000 (using FC4-32), the numbering is contiguous up to port
15; from port 16, the numbering is still contiguous, but you must add 128 to each port number. For
example, port 16 in slot 1 has a port number and area ID of 128; port number 15 has a port number
and area ID of 15.
• When Extended-edge PID format is in effect, the area ID is the port number plus 16 for ports 0 to
111. For port numbers higher than 111, the area ID wraps around so that port 112 has an area ID of
0, and so on. Each 64-port logical switch (domain) has area IDs ranging from 16 to 79. Port
numbers higher than 128 are mapped directly to the core PID.
For details about port area IDs in Extended-edge PID mode, refer to “Changing to Extended Edge
PID Format” on page A-10.
• If you perform a port swap operation, the port number and area ID no longer match.
To determine the area ID of a particular port, enter the switchShow command. This command displays
all ports on the current (logical) switch and their corresponding area IDs.
switch:admin> portenable 2/4