Edge-Core ECS4660-28F, Management Manual, Page: 1259 / 2020

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35
L
OOPBACK
D
ETECTION
C
OMMANDS
The switch can be configured to detect general loopback conditions caused
by hardware problems or faulty protocol settings. When enabled, a control
frame is transmitted on the participating ports, and the switch monitors
inbound traffic to see if the frame is looped back.
U
SAGE
G
UIDELINES
◆
The default settings for the control frame transmit interval and recover
time may be adjusted to improve performance for your specific
environment. The shutdown mode may also need to be changed once
you determine what kind of packets are being looped back.
◆
General loopback detection provided by the command described in this
section and loopback detection provided by the spanning tree protocol
cannot both be enabled at the same time. If loopback detection is
enabled for the spanning tree protocol, general loopback detection
cannot be enabled on the same interface.
◆
When a loopback event is detected on an interface or when an interface
is released from a shutdown state caused by a loopback event, a trap
message is sent and the event recorded in the system log.
◆
Loopback detection must be enabled both globally and on an interface
for loopback detection to take effect.
Table 147: Loopback Detection Commands
Command Function Mode
loopback-detection Enables loopback detection globally on the
switch or on a specified interface
GC, IC
loopback-detection
action
Specifies the response to take for a detected
loopback condition
GC
loopback-detection
recover-time
Specifies the interval to wait before releasing an
interface from shutdown state
GC
loopback-detection
transmit-interval
Specifies the interval at which to transmit
loopback detection control frames
GC
loopback detection
trap
Configures the switch to send a trap when a
loopback condition is detected or the switch
recover from a loopback
GC
loopback-detection
release
Manually releases all interfaces currently shut
down by the loopback detection feature
PE
show loopback-
detection
Shows loopback detection configuration settings
for the switch or for a specified interface
PE