QTECH QSW-8300 Инструкция по настройке - Manual (Page 160)

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22.4 Kepalive Gteway Troubleshooting
If there is any problem happens when using keepalive gateway function, please check whether
the problem is caused by the following reasons:
Make sure the device is layer 3 switch, layer 2 switch does not support keepalive gateway
The detection method is used to point-to-point topology mode only
Detect IPv4 accessibility by the method, so the detection result only affects IPv4 traffic, other
traffic such as IPv6 is not affected
Physical state of interface only controlled by physical signal
Interface can’t run IPv4 after determine gateway is not reachable, so all relative IPv4 routes
are deleted and IPv4 route protocol can’t establish the neighbor on the interface