Edge-Core ECS4660-28F, Management Manual, Page: 1282 / 2020

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HAPTER
38
| Spanning Tree Commands
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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
C
OMMAND
U
SAGE
◆
The path cost method is used to determine the best path between
devices. Therefore, lower values should be assigned to ports attached
to faster media, and higher values assigned to ports with slower media.
Note that path cost ( page 1290 ) takes precedence over port priority
( page 1298 ).
◆
The path cost methods apply to all spanning tree modes (STP, RSTP
and MSTP). Specifically, the long method can be applied to STP since
this mode is supported by a backward compatible mode of RSTP.
E
XAMPLE
Console(config)#spanning-tree pathcost method long
Console(config)#