3 Troubleshooting Functional Failures During Operation
51
(4) Identifying the range for a failure (from a customer's terminal)
To use the customer's terminal to identify the range for a failure so that you can determine
the fault location on the route with a remote device in an environment in which login to the
Switch is not possible, do the following:
1.
Make sure the customer's terminal has the
ping
functionality.
2.
Use the
ping
functionality to check whether communication between the customer's
terminal and the remote device is possible.
3.
If communication with the remote device cannot be verified by using the
ping
functionality, use the
ping
operation command to check communication with each of
the devices up to the remote device, beginning with the device closest to the
customer's terminal.
4.
If you are able to determine the range for the failure by using the
ping
functionality
and pinpoint the Switch that is likely to have the failure, log in to the Switch and
investigate the cause of the failure based on the failure analysis flowchart.
(5) Checking the ARP resolution information with a neighboring device
If the execution result of the
ping
operation command indicates that communication with a
neighboring device is impossible, the address might not have been resolved by ARP. To
check the status of address resolution between the Switch and the neighboring device, do
the following:
1.
Log in to the Switch.
2.
Use the
show
ip
arp
operation command to check the status of address resolution
(whether ARP entry information exists) between the Switch and the neighboring
device.
3.
If the address with the neighboring device has been resolved (ARP entry information
exists), see
(6) Checking the unicast routing information
.
4.
If the address has not been resolved (no ARP entry information exists), check
whether the IP network settings between the neighboring device and the Switch are
identical. Alternatively, see
3.4 Network interface communication failures
.
(6) Checking the unicast routing information
You need to check the routing information obtained by the Switch if (a) communication is
still disabled after address resolution with the neighboring device is completed, (b)
communication is disabled on the route to the remote device during IPv4 unicast
communication, or (c) the route to the remote device has a problem. To carry out the check,
do the following:
1.
Log in to the Switch.
2.
Execute the
show
ip
route
operation command to check the routing information
obtained by the Switch.
3.
If the displayed information contains routing information, check the settings of the
IPv4 network interface functionality.
4.
If the displayed information does not contain the routing information or contains an
incorrect address for the interface's next hop, check the Switch settings.
5.
If the routing information obtained by the Switch contains routing information about
the interface that caused the communication failure, the interface might have a
problem with the functionality shown below. That functionality must be checked.
DHCP server functionality
See
(7) Checking the DHCP server configuration information.
Filter functionality
Содержание AX2500S
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