115
System Capabilities
The neighbor’s capability.
Management
Address
The neighbor’s management address.
Time To Live
The hold time for the neighbor’s information.
6.9.
Loop Detection
6.9.1.
Introduction
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
itch detects 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.
The default Loop Detection Destination MAC is
00:0b:04:AA:AA:AB
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
Recovery Recovery
Port State Status State Time Port State Status State Time
---- -------- ------- -------- ---- ---- -------- ------- -------- ----
1 Disabled Normal Enabled 1 2 Disabled Normal Enabled 1
3 Disabled Normal Enabled 1 4 Disabled Normal Enabled 1
5 Disabled Normal Enabled 1 6 Disabled Normal Enabled 1
7 Disabled Normal Enabled 1 8 Disabled Normal Enabled 1
