Alaxala AX2500S, Руководство по устранению неисправностей

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3 Troubleshooting Functional Failures During Operation
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to determine the fault location on the route, do the following:

Log in to the Switch.

If there are devices such as an L3 switch between the client and the server, use the
ping operation command to check the communication between the L3 switch and the
remote device (DHCP client). If the communication with the remote device cannot be
verified by using the
ping operation command, execute the ping operation command
again to check communication with each of the devices up to the client, beginning with
the device closest to the Switch. For details about examples of using the
ping
operation command and how to interpret the execution result, see the Configuration
Guides .

If the server and the client are directly connected, check the hub and cable
connections.
(d) Checking the filtering and QoS control configuration information
If communication is not possible even when there is no physical failure on the Switch,
certain packets might have been discarded by the filter functionality or packets might have
been discarded by the QoS functionality shaper. Therefore, on the Switch and the relay
device between the client and server, check in the system configuration whether the setting
conditions for the filter functionality and QoS control in the configuration are correct and
whether the shaper is used appropriately. For details about the procedure, see
3.15.1
Checking the filtering and QoS control configuration information .
(e) Checking the Layer 2 network
If you do not find any incorrect settings or a failure in the steps (a) to (e), there might be a
problem with the Layer 2 network. Check the Layer 2 network according to
3.5 Layer 2
network communication failures .