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In addition to the basic MSTP functions, 3com Switch 4500 also provides the following functions for
users to manage their switches.
z Root bridge hold
z Root bridge backup
z Root guard
z BPDU guard
z Loop guard
z TC-BPDU attack guard
Protocols and Standards
MSTP is documented in:
z IEEE 802.1D: spanning tree protocol
z IEEE 802.1w: rapid spanning tree protocol
z IEEE 802.1s: multiple spanning tree protocol
MSTP Configuration Task List
Before configuring MSTP, you need to know the position of each device in each MSTI: root bridge or
leave node. In each MSTI, one, and only one device acts as the root bridge, while all others as leaf
nodes.
Complete these tasks to configure MSTP:
Task Remarks
Enabling MSTP
Required
To prevent network topology jitter
caused by other related configurations,
you are recommended to enable MSTP
after other related configurations are
performed.
Configuring an MST Region Required
Specifying the Current Switch as a Root
Bridge/Secondary Root Bridge
Required
Configuring the Bridge Priority of the
Current Switch
Optional
The priority of a switch cannot be
changed after the switch is specified as
the root bridge or a secondary root
bridge.
Configuring How a Port Recognizes and
Sends MSTP Packets
Optional
Configuring the MSTP Operation Mode Optional
Configuring the Maximum Hop Count of an
MST Region
Optional
Configuring the Network Diameter of the
Switched Network
Optional
The default value is recommended.
Configuring the MSTP Time-related
Parameters
Optional
The default values are recommended.
Configuring
Root Bridge
Configuring the Timeout Time Factor Optional