Loop Detection - TRENDnet TI-RG262i User Manual

TRENDnet User's Guide
Internal Information
Port Priority The port priority of the LACP member port.
Admin Key The Admin key of the LACP member port.
Oper Key The Oper key of the LACP member port.
Port State The port state of the LACP member port.

Loop Detection

Loop detection is designed to handle loop problems on the edge of your network. This
can occur when a port is connected to a Switch that is in a loop state. Loop state occurs
as a result of human error. It happens when two ports on a switch are connected with
the same cable. When a switch in loop state sends out broadcast messages the
messages loop back to the switch and are re-broadcast again and again causing a
broadcast storm.
The loop detection function sends probe packets periodically to detect if the port
connect to a network in loop state. The Switch shuts down a port if the Sw
that probe packets loop back to the same port of the Switch.
Loop Recovery:
When the loop detection is enabled, the Switch will send one probe packets every two
seconds and then listen this packet. If it receives the packet at the same port, the
Switch will disable this port. After the time period, recovery time, the Switch will
enable this port and do loop detection again.
The Switch generates syslog, internal log messages as well as SNMP traps when it shuts
down a port via the loop detection feature.
Default Settings
The default global Loop-Detection state is disabled.
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The default Loop Detection Destination MAC is
The default Port Loop-Detection state is disabled for all ports.
The default Port Loop-Detection status is unblocked for all ports.
The loop detection on the Switch is disabled.
Loop Detection Destination MAC=00:0b:04:aa:aa:ab
Port State Status
---- --------
1 Disabled Normal Enabled 1
3 Disabled Normal Enabled 1
5 Disabled Normal Enabled 1
7 Disabled Normal Enabled 1
9 Disabled Normal Enabled 1
11 Disabled Normal Enabled 1
13 Disabled Normal Enabled 1
itch detects
15 Disabled Normal Enabled 1
CLI Configuration
Node
enable
configure
configure
Managed Industrial L2 Switch
Recovery Recovery
State Time Port State Status
------- -------- ---- ---- --------
2 Disabled Normal Enabled 1
4 Disabled Normal Enabled 1
6 Disabled Normal Enabled 1
8 Disabled Normal Enabled 1
10 Disabled Normal Enabled 1
12 Disabled Normal Enabled 1
14 Disabled Normal Enabled 1
16 Disabled Normal Enabled 1
Command
show loop-detection
loop-detection (disable | enable)
loop-detection address
MACADDR
00:0b:04:AA:AA:AB
State Time
------- -------- ----
Description
This command displays the current
loop detection configurations.
This command disables / enables
the loop detection on the switch.
This command configures the
destination MAC for the loop
detection special packets.
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