Alcatel-Lucent 1643 AMS

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Determination of the root

For every switch a priority can be configured. The switch priority is a number between

0 (highest priority) and 61440 (lowest priority) in steps of 4096. The switch with the

highest priority will become root.

If there are two or more switches with the same highest priority, then the switch with

the lowest number for the MAC address will become root. This rule ensures that there

is always exactly one root, as MAC addresses are unique.

Determination of the root ports

Root ports are those ports that will be used to reach the root. For each switch the port

with the lowest root path cost is chosen, where the root path cost is determined by

adding the path costs to the root. In the example port 2b and 3b are root ports.

LAN

Root

Switch 1

Switch 2

Switch 3

LAN

Priority: 28072

Priority: 32768

Ethernet Overview

Spanning tree protocol (STP)

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365-312-801R7.2

Issue 3, May 2007

Alcatel-Lucent - Proprietary

See notice on first page

11-15

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