Is the loop symptom relieved?
Confirm loop *
If the loop symptom relieved when the port is disable, we can know the port has
loop.
Why the port has loop, but loop guard doesn’t active?
A: Zyxel loop guard feature is use the loop-guard packet to discover where the loop
is. It is a multicast packet. But some features (ex. Unknown packet drop) will drop the
loop-guard packet. If there are any clients (devices) which have those feature. The
loop-guard will not be active. So that we suggest that the loop guard should be
enabled in the end device.
Others
1. There is no loop we can find in the topology, please go to the next process of
trouble shooting.
How to setup Loop Guard auto-recovery
1. WebGUI
Figure 14 Advanced Application > Errdisable > Errdisable Recovery
2. CLI: (config)# errdisable recovery cause loopguard interval <seconds>
Figure 15
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