Alcatel OS6850-48 User Guide - Page 185

Managing OmniSwitch 6850/6850E Series Stacks Slot Numbering Dynamic Slot Number Assignment Dynamic slot number assignment occurs when there are no boot.slot.cfg files present in the switches' /flash directories. This is the case for new, "out of the box," switches that have not been previously booted. When a brand new stack (or stack with no boot.slot.cfg files) is booted, the system software automatically detects the module with the lowest MAC address. This module is assigned the primary management role (see page 6-5) and, by default, is given the slot number 1. The module connected to the primary's stacking port A is automatically assigned the secondary management role and given the slot number 2. As the other modules in the stack become operational, they are assigned idle roles and are automatically assigned unique slot numbers (3-8, depending on the number of switches in the stack). The slot numbering for idle modules is determined by each module's physical location in the stack. Refer to the diagrams below for more information on dynamic slot numbering. Note. As the slot numbers are dynamically assigned, boot.slot.cfg files are auto-generated in the /flash directory of each switch. When modules are subsequently booted, each switch reads its slot number assignment from this file and comes up accordingly. Slot 6 - Idle Slot 7 - Idle Slot 8 - Idle Slot 1 - Primary Slot 2 - Secondary Slot 3 - Idle Slot 4 - Idle Slot 5 - Idle In this example, the fourth switch from the top is elected the primary management module for the stack. (It can be assumed that this switch has the lowest MAC address in the stack.) This switch is automatically assigned slot number 1. The switch immediately below is connected to the primary switch's stacking port A and, as a result, is assigned the secondary management role and given slot number 2. The system software allows the switch immediately below slot 2 to have the next slot number preference. It is assigned an idle role and given the slot number 3. The switch immediately below slot 3 is given the slot number 4, and so on. When the bottom of the stack is reached, the slot numbering sequence resumes at the top of the stack, as shown. This helps ensure a more ordered and manageable stack topology. Dynamic Slot Numbering Example 1 OmniSwitch 6850/6850E Series Hardware Users Guide June 2011 page 6-23