Alcatel-Lucent 6850-48 Network Guide

Spanning Tree Specifications

Using 802.1Q 2005 Multiple Spanning Tree

page 12-2

OmniSwitch AOS Release 6 Network Configuration Guide

IEEE Standards supported

802.1D–Media Access Control (MAC) Bridges
802.1w–Rapid Reconfiguration (802.1D Amendment 2)
802.1Q 2005–

 

Spanning Tree Protocols supported

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

Platforms Supported

OmniSwitch 6400, 6800, 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

Maximum 1x1 Spanning Tree instances 
per switch

252

Maximum flat mode Multiple Spanning 
Tree Instances (MSTI) per switch

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.

Spanning Tree operating mode

1x1 (a separate Spanning Tree 
instance for each VLAN)

Spanning Tree protocol

RSTP (802.1w)

Priority value for a Multiple Spanning 
Tree Instance (MSTI).

32768

Hello time interval between each BPDU 
transmission.

2 seconds

Maximum aging time allowed for Span-
ning Tree information learned from the 
network.

20 seconds

Spanning Tree port state transition time.

15 seconds

BPDU switching status.

Disabled

Path cost mode

AUTO (16-bit in 1x1 mode, 32-
bit in flat mode)