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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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• SNMP Traps <strong>for</strong> Root Elections and Topology Changes on page 395<br />

• Configure Spanning Trees as Hitless on page 396<br />

Important Points to Remember<br />

• Spanning Tree Protocol (STP) is disabled by default.<br />

• <strong>FTOS</strong> supports only one Spanning Tree instance (0). Refer to <strong>FTOS</strong> Command Line Interface<br />

Reference chapter MSTP <strong>for</strong> in<strong>for</strong>mation rearding multiple STP support.<br />

• All ports in VLANs and all enabled interfaces in Layer 2 mode are automatically added to <strong>the</strong><br />

Spanning Tree topology.<br />

• Any Layer 2 interfaces that are to be added to <strong>the</strong> Spanning Tree topology after STP has been enabled<br />

globally must be added manually.<br />

• The IEEE Standard 802.1D allows eight bits <strong>for</strong> port ID and eight bits <strong>for</strong> priority. However, <strong>the</strong> eight<br />

bits <strong>for</strong> port ID provide port IDs <strong>for</strong> only 256 ports and <strong>the</strong> C-<strong>Series</strong> can contain 336 ports. To<br />

accommodate <strong>the</strong> increased number of ports, <strong>FTOS</strong> uses four bits from priority field in <strong>the</strong> port ID<br />

field.This implementation affects <strong>the</strong> Bridge MIB (RFC 1493), and you must interpret objects such as<br />

dot1dStpPortDesignatedPort object by using <strong>the</strong> first four bits as <strong>the</strong> priority and <strong>the</strong> last 12 bits as <strong>the</strong><br />

port ID.<br />

386 Spanning Tree Protocol

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