What Could Go Wrong - ZyXEL Communications GS2210 series Handbook

3.1.5 What Could Go Wrong

1 The stacking ports are usually the last 2 ports of the switch. If
you connect the two switches using a non-stacking port, you
will find that the two switches will not form a stacking system.
2 Remember to save the configuration before doing the test. If
you forget to save the configuration, after rebooting, all the
configurations will be lost. Therefore, the Link Aggregation will
disappear.
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