Spanning-Tree Loopback-Detection Release-Mode - Edge-Core ECS4810-12M Layer 2 Management Manual

spanning-tree
loopback-detection
release-mode
This command configures the release mode for a port that was placed in
the discarding state because a loopback BPDU was received. Use the no
form to restore the default.
S
YNTAX

spanning-tree loopback-detection release-mode

{auto | manual}
no spanning-tree loopback-detection release-mode
auto - Allows a port to automatically be released from the
discarding state when the loopback state ends.
manual - The port can only be released from the discarding state
manually.
D S
EFAULT ETTING
auto
C M
OMMAND ODE
Interface Configuration (Ethernet, Port Channel)
C U
OMMAND SAGE
◆ If the port is configured for automatic loopback release, then the port
will only be returned to the forwarding state if one of the following
conditions is satisfied:
The port receives any other BPDU except for it's own, or;
■
The port's link status changes to link down and then link up again,
■
or;
The port ceases to receive it's own BPDUs in a forward delay
■
interval.
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)#
– 1057 –
| Spanning Tree Commands
C 34
HAPTER
command.