C
HAPTER
34
| Spanning Tree Commands
– 1084 –
spanning-tree
loopback-detection
trap
This command enables SNMP trap notification for Spanning Tree loopback
BPDU detections. Use the no form to restore the default.
SYNTAX
[no] spanning-tree loopback-detection trap
DEFAULT SETTING
Disabled
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
EXAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection trap
spanning-tree
mst cost
This command configures the path cost on a spanning instance in the
Multiple Spanning Tree. Use the no form to restore the default auto-
configuration mode.
SYNTAX
spanning-tree mst instance-id cost cost
no spanning-tree mst instance-id cost
instance-id - Instance identifier of the spanning tree.
(Range: 0-4094)
cost - Path cost for an interface. (Range: 0 for auto-configuration,
1-65535 for short path cost method
24
, 1-200,000,000 for long path
cost method)
The recommended path cost range is listed in Table 1 2 6 on
page 1079.
DEFAULT SETTING
By default, the system automatically detects the speed and duplex mode
used on each port, and configures the path cost according to the values
shown below. Path cost “0” is used to indicate auto-configuration mode.
When the short path cost method is selected and the default path cost
recommended by the IEEE 8021w standard exceeds 65,535, the default is
set to 65,535. The default path costs are listed in Table 127 on page 1079.
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
◆ Each spanning-tree instance is associated with a unique set of VLAN
IDs.
24. Use the spanning-tree pathcost method command to set the path cost method.
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