Alcatel-Lucent 6850-48 Network Guide

Configuring Spanning Tree Parameters

Spanning Tree Specifications

OmniSwitch AOS Release 6 Network Configuration Guide

page 13-3

IEEE Standards supported

802.1D–Media Access Control (MAC) Bridges
802.1w–Rapid Reconfiguration (802.1D Amendment 2)
802.1Q 2005–Virtual Bridged Local Area Networks
802.1Q 2005–Multiple Spanning Trees (MSTP)

Spanning Tree Protocols supported

802.1D Standard Spanning Tree Algorithm and Protocol 
(STP)
802.1w Rapid Spanning Tree Algorithm and Protocol (RSTP)
802.1Q 2005 Multiple Spanning Tree Protocol (MSTP)
Ring Rapid Spanning Tree Protocol (RRSTP)

Platforms Supported

STP, RSTP, MSTP
RRSTP
1x1 PVST+

OmniSwitch 6400, 6800, 6850, 6855, and 9000
OmniSwitch 6400, 6850, 6855, and 9000
OmniSwitch 6400, 6850, 6855, and 9000

Spanning Tree Operating Modes supported Flat mode - one spanning tree instance per switch

1x1 mode - one spanning tree instance per VLAN

Spanning Tree port eligibility

Fixed ports (non-mobile)
802.1Q tagged ports
Link aggregate of ports

Number of 1x1 Spanning Tree instances 
supported 

252

Number of Multiple Spanning Tree 
Instances (MSTI) supported 

16 MSTI, in addition to the Common and Internal Spanning 
Tree instance (also referred to as MSTI 0).

Number of Ring Rapid Spanning Tree 
(RRSTP) rings supported 

128
8 (OmniSwitch 6400)

CLI Command Prefix Recognition

All Spanning Tree commands support prefix recognition. See 
the “Using the CLI” chapter in the OmniSwitch AOS Release 
6 Switch Management Guide for more information.