Comnet CWGE24MS2, Инструкция по установке и эксплуатации

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INS_CWGE24MS2_REV–
10/05/16 PAGE 155
INSTALLATION AND OPERATION MANUAL CWGE24MS2
TECH SUPPORT: 1.888.678.9427
Loop Detection
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 Switch 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 00:22:3b: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=00:22:3b: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
9 Disabled Normal Enabled 1 10 Disabled Normal Enabled 1
11 Disabled Normal Enabled 1 12 Disabled Normal Enabled 1
13 Disabled Normal Enabled 1 14 Disabled Normal Enabled 1
15 Disabled Normal Enabled 1 16 Disabled Normal Enabled 1
17 Disabled Normal Enabled 1 18 Disabled Normal Enabled 1
19 Disabled Normal Enabled 1 20 Disabled Normal Enabled 1
21 Disabled Normal Enabled 1 22 Disabled Normal Enabled 1
23 Disabled Normal Enabled 1 24 Disabled Normal Enabled 1