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168 CHAPTER 13: MSTP CONFIGURATION
MSTP Implementation
on Switches
MSTP is compatible with both STP and RSTP. That is, switches running MSTP can
recognize STP and RSTP packets and use them to calculate spanning trees. In addition
to the basic MSTP functions, a S5500 series switch also provides many special
functions for ease of management to further meet the needs of users, as listed in the
following.
■ Root bridge retaining
■ Root bridge backup
■ Root protection
■ BPDU protection
■ Loop prevention
Root Bridge
Configuration
Table 141 lists the MSTP configuration tasks for root bridges.
With both GVRP and MSTP enabled on switches, GVRP packets will be forwarded
along the CIST. If you want to broadcast packets of a specific VLAN through GVRP, be
sure to map the VLAN to the CIST when configuring the MSTP VLAN mapping table.
The CIST of a network is the spanning tree instance numbered 0.
Table 141 Root bridge configuration
Operation Description Related section
Enable MSTP Required
Normally, to reduce network
topology jitters caused by
configuration, you are
recommended to enable MSTP
after completing other related
configurations.
Enabling MSTP
Configure an MST region Required Configuring an MST Region
Set the switch as the
root/secondary root bridge
Required Setting a switch as the root bridge
of a spanning tree
Configure the bridge
priority of the switch
Optional
The priority of a switch cannot
be changed after the switch is
specified as the root bridge or
a secondary root bridge.
Setting a switch as a secondary
root bridge of a spanning tree
Configure MSTP operation
mode
Optional Configuring MSTP Operation Mode
Configure the maximum
hop count of an MST region
Optional Configuring the Maximum Hop
Count of an MST Region
Configure the diameter of a
switched network
Optional
The default is recommended.
Configuring the Diameter of a
Switched Network
Configure MSTP time
parameters
Optional
The defaults are
recommended.
Configuring MSTP Time Parameters
Configure the timeout time
factor
Optional Configuring the Timeout Time
Factor
Configure the maximum
transmission speed of a port
Optional
The default is recommended.
Configuring the Maximum
Transmission Speed of a Port
Set a port as an edge port Optional Setting a Port as an Edge Port
Specify whether a port
connect to point-to-point
link
Optional Specifying whether a Port Connect
to Point-to-Point Link