Table of Contents
Advertisement
Chapter 34: Spanning Tree Commands
spanning-tree
loopback-detection
trap
spanning-tree
mst cost
If Port Loopback Detection is not enabled and a port receives it's own
•
BPDU, then the port will drop the loopback BPDU according to IEEE
Standard 802.1W-2001 9.3.4 (Note 1).
•
Port Loopback Detection will not be active if Spanning Tree is disabled
on the switch.
When configured for manual release mode, then a link down / up event
•
will not release the port from the discarding state. It can only be
released using the
spanning-tree loopback-detection release
E
XAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection release-mode manual
Console(config-if)#
This command enables SNMP trap notification for Spanning Tree loopback
BPDU detections. Use the no form to restore the default.
S
YNTAX
[no] spanning-tree loopback-detection trap
D
S
EFAULT
ETTING
Disabled
C
M
OMMAND
ODE
Interface Configuration (Ethernet, Port Channel)
E
XAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection trap
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.
S
YNTAX
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
cost method)
spanning-tree pathcost method
2. Use the
– 1039 –
2
, 1-200,000,000 for long path
command to set the path cost method.
command.
Advertisement
Table of Contents
