Technical information

AX Series L2 Loop Detection Configuration Guide (Edition 2)
Copyright © 2008, 2010, ALAXALA Networks Corporation. All rights reserved.
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A loop is created by connecting two ports on an intermediate device (such as a hub) belonging to the switch
device.
In this case, using the show loop-detection command results in the following display:
This indicates that port 0/5 is in the inact status because port 0/5 received an L2 loop detection frame from port
0/5 itself.
(c) Loop with another switch device (via upstream network):
- A loop is created by connecting a switch device to another switch device via an upstream network in the
same segment.
- A loop is created by connecting an intermediate device (such as a hub) under a switch device to another
switch device via an upstream network in the same segment.
- A loop is created by connecting an intermediate device (such as a hub) under a switch device to an
intermediate device (such as a hub) under another switch device via an upstream network in the same
segment.
In these cases, using the show loop-detection command results in the following display:
(When port 0/1 is set as an uplink port)
This indicates that port 0/5 as a source port is in the inact status because port 0/1 as an uplink port received an
L2 loop detection frame from port 0/5.
As shown above, you can investigate ports in the loop status based on the messages by the operation command
by referring to the network configuration diagram.
0/5
- Connecting ports on a hub
under the device
>show loop-detection
...
Port Information
Port Status Type DetectCnt RestoringTimer SourcePort Vlan
0/5 Down(loop) send-inact 1 - 0/5 10
0/5
0/1
0/1
0/5
0/5
0/1
- Connecting a hub under the device
and a hub under another device
- Connecting a hub under the
device and another device
- Connecting the device and
another device
>show loop-detection
...
Port Information
Port Status Type DetectCnt RestoringTimer SourcePort Vlan
0/1 Up uplink - - 0/5 10
0/5 Down(loop) send-inact 1 - 0/1(U) 10