Understanding Stack Resiliency; Understanding Advanced Stacking; Unit Ids - Cisco SGE2000 Administration Manual

Adding Units to a Running Stack
1. Reset the units to be added by restoring them to the factory default mode.
2. Connect the units physically to the stack.
3. Power the units on. After a short interval, they will become stack members, but will have
automatically-assigned Unit IDs. Assign each such unit its desired Unit ID (using the
Stack Management Interface through the console port, by Telnet, or by using the
graphical user interface (GUI).
4. Reset the units to make this assignment permanent.
NOTE: We recommended that if you manually assign a
Unit ID to one unit, you manually assign Unit IDs to all
units. Using a mix of both system-assigned and manually-
assigned IDs in your network can impact system
performance.
5. The unit that is assigned the Unit ID 1 is the Stack Master, and its front panel "MST" LED
lights green. The unit assigned the Unit ID 2 is the Backup Master.

Understanding Stack Resiliency

Stacks can be configured in ring or chain topologies. We recommend configuring the stack
in ring topology, due to the high resiliency in case of unit failure or stacking links failure.
Additionally, if a redundant power supply is present, we recommend connecting the Stack
Master and Backup Master units to the redundant power supply.

Understanding Advanced Stacking

To understand advanced stacking, you must understand Unit IDs and how they are
allocated, and the stack unit startup process.

Unit IDs

Each unit in a stack has an assigned unique Unit ID number. The following sections describe
the Unit IDs and their characteristics.
15
Linksys One Ready Communications Solution
Chapter 3: Connecting the Switch
Understanding Stack Resiliency
3