MST Specifications Using 802.1Q 2005 Multiple Spanning Tree
page 2-2 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
MST Specifications
Spanning Tree Bridge Parameter Defaults
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
Spanning Tree Operating Modes supported Flat mode - one spanning tree instance per switch
1x1 mode - one spanning tree instance per VLAN
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)
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).
CLI Command Prefix Recognition All Spanning Tree commands support prefix recognition. See
the “Using the CLI” chapter in the OmniSwitch 6800/6850/
9000 Switch Management Guide for more information.
Parameter Description Command Default
Spanning Tree operating mode bridge mode 1x1 (a separate Spanning Tree
instance for each VLAN)
Spanning Tree protocol bridge protocol STP (802.1D) on OmniSwitch
9000
RSTP (802.1w) on OmniSwitch
6800 and 6850
BPDU switching status. bridge bpdu-switching Disabled
Priority value for the Spanning Tree
instance.
bridge priority 32768
Hello time interval between each BPDU
transmission.
bridge hello time 2 seconds
Maximum aging time allowed for Span-
ning Tree information learned from the
network.
bridge max age 20 seconds
Spanning Tree port state transition time. bridge forward delay 15 seconds
Automatic VLAN Containment bridge auto-vlan-contain-
ment
Disabled
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