2.5.2 - Force10 Networks

Port Naming Convention
SFTOS supports stacking (one virtual switch made by connecting several switches) with the port naming
convention “unit/slot/port”. For example, in show interface 1/0/11, 1/0/11 represents unit 1 in the stack,
slot 0, port 11. If the port were in unit 2 of the stack, the command should be show interface 2/0/11.
In more detail, the physical entities that define this convention are as follows:
• Unit—The switch ID in a stack of switches (begins with the number 1, so the ports of a standalone
switch are numbered 1/slot/port).
• Slot—slot numbers for modular entities within the switch. Although S-Series switches have optional
port modules that might qualify for a slot number, S-Series switches currently always list the slot
number as 0 (listing all physical ports as unit/0/port) unless representing a logical entity, such as a
port channel.
• Port—physical interface (port numbers are sequential starting at 1).
Logical interface identifiers are automatically generated by SFTOS. They also use the unit/slot/port
convention, but:
• Logical unit numbers are always 0.
• Logical slot numbers are sequential and start with a 1.
• Logical interface numbers (in the third position) are also sequential starting at 1 for each slot.
VLAN routing interfaces and port channels (LAGs) are logical entities. Logical interface identifiers are
defined by the system upon creation.
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