Supermicro SSE-G2252, Руководство пользователя

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Chapter 34: Spanning Tree Commands
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the incoming protocol messages and dynamically adjusting the type of
protocol messages the RSTP node transmits, as described below:
•
STP Mode – If the switch receives an 802.1D BPDU after a port’s
migration delay timer expires, the switch assumes it is connected to
an 802.1D bridge and starts using only 802.1D BPDUs.
•
RSTP Mode – If RSTP is using 802.1D BPDUs on a port and receives
an RSTP BPDU after the migration delay expires, RSTP restarts the
migration delay timer and begins using RSTP BPDUs on that port.
•
Multiple Spanning Tree Protocol
•
To allow multiple spanning trees to operate over the network, you
must configure a related set of bridges with the same MSTP
configuration, allowing them to participate in a specific set of
spanning tree instances.
•
A spanning tree instance can exist only on bridges that have
compatible VLAN instance assignments.
•
Be careful when switching between spanning tree modes. Changing
modes stops all spanning-tree instances for the previous mode and
restarts the system in the new mode, temporarily disrupting user
traffic.
E
XAMPLE
The following example configures the switch to use Rapid Spanning Tree:
Console(config)#spanning-tree mode rstp
Console(config)#
spanning-tree
pathcost method
This command configures the path cost method used for Rapid Spanning
Tree and Multiple Spanning Tree. Use the no form to restore the default.
S
YNTAX
spanning-tree pathcost method { long | short }
no spanning-tree pathcost method
long - Specifies 32-bit based values that range from
1-200,000,000. This method is based on the IEEE 802.1w Rapid
Spanning Tree Protocol.
short - Specifies 16-bit based values that range from 1-65535.
This method is based on the IEEE 802.1 Spanning Tree Protocol.
D
EFAULT
S
ETTING
Long method
C
OMMAND
M
ODE
Global Configuration