Problems Related To Arp; Communication Problems Due To Causes Other Than Dhcp And Arp - Alaxala AX6700S Troubleshooting Manual

3 Troubleshooting Functional Failures During Operation

3.26.3 Problems related to ARP

If ARP packets are discarded, IPv4 communication is not possible. A probable cause of
ARP packets being discarded is dynamic ARP inspection. Isolate the cause of the problem
according to the failure analysis method described in the following table.
Table 3-85 Failure analysis method for problems caused by dynamic ARP inspection
No. Items to check
1 Check the DHCP snooping configuration.
2 Execute the
show ip arp inspection
statistics
operation status of dynamic ARP inspection.
3 Execute the
show ip dhcp snooping
command, and make sure that the
binding
binding information is present for the device
on which communication is not possible.
4 Other cases

3.26.4 Communication problems due to causes other than DHCP and ARP

If terminal filters are enabled, all packets are discarded, except DHCP and ARP packets
from devices not in the binding information. Isolate the cause of the problem according to
the failure analysis method described in the following table.
Table 3-86 Failure analysis method for problems caused by terminal filters
No. Items to check
1 Check the DHCP snooping configuration.
2 Check whether the
configuration command is set for the target
port.
174
command to check the
ip verify source
Action
See 3.26.1 Problems related to DHCP, and make sure
DHCP snooping is operating normally.
If there is no problem, go to No. 2.
If a port is displayed as an untrusted port at which
dynamic ARP inspection is enabled and the port is the
one at which IPv4 communication is not possible, go
to No. 3.
If the target device is connected to another port,
dynamic ARP inspection is not enabled for the device.
Check the network configuration and the settings of
the device on which IPv4 communication is not
possible, and if there is no problem, go to No. 4.
If the binding information is not present and the target
device has a fixed IP address, set the
configuration command. If the binding
binding
information is not present and the target device
obtains an IP address by DHCP, obtain an IP address
again.
If any of the above actions do not resolve your
problem, check other functionality used in the device
according to this manual.
Action
See 3.26.1 Problems related to DHCP, and make sure
DHCP snooping is operating normally.
If there is no problem, go to No. 2.
If is set, packets from devices not
ip verify source
in the binding information are discarded. If there is no
problem, go to No. 3.
If is not set, go to No. 4.
ip verify source
ip source