Loop Detection - TRENDnet TI-PG1284i User Manual

TRENDnet User's Guide
Management
The neighbor's management address.
Address
Time To Live The hold time for the neighbor's information.

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
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.
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.
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itch detects that probe
00:0b:04:AA:AA:AB
The loop detection on the Switch is disabled.
Loop Detection Destination MAC=00:0b:04:aa:aa:ab
Recovery
Port State Status State Time Port State Status State Time
---- -------- ------- -------- ---- ---- -------- ------- -------- ----
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
CLI Configuration
Node Command
enable show loop-detection
configure loop-detection (disable |
enable)
configure loop-detection address
MACADDR
configure no loop-detection
address
interface loop-detection (disable |
enable)
interface no shutdown
interface loop-detection recovery
(disable | enable)
TI-PG1284i
Recovery
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
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.
This command configures the destination
MAC to default (00:0b:04:AA:AA:AB).
This command disables / enables the loop
detection on the port.
This command enables the port. It can
unblock port blocked by loop detection.
This command enables / disables the
recovery function on the port.
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