4 arp troubleshooting, 1 commands for monitor and debug, 1 debug arp – Accton Technology ES4626 User Manual
Page 317: 2 show arp
317
route table to determine whether the destination network is reachable before responding
to the ARP request; ARP request will only be responded if the destination is reachable.
Note: the ARP request matching default route will not use proxy.
Example:
Enabling proxy ARP for VLAN 1.
Switch(Config-If-Vlan1)#ip proxy-arp
9.5.3.4 ARP Troubleshooting
If ping from the switch to directly connected network devices fails, the following can be
used to check the possible cause and create a solution.
z
Check whether the corresponding ARP has been learned by the switch.
z
If ARP has not learned, then enabled ARP debugging information and view
sending/receiving condition of ARP packets.
Defective cable is a common cause of ARP problems and may disable ARP learning.
Command
9.5.3.4.1 Commands for Monitor And Debug
9.5.3.4.1.1 debug arp
Command: debug arp
no debug arp
Function:
Enables the ARP debugging function; the “no debug arp” command disables
this debugging function.
Default:
ARP debug is disabled by default.
Command mode:
Admin Mode
Usage Guide:
Display contents for ARP packets received/sent, including type, source
and destination address, etc.
Example:
Enabling ARP debugging
Switch#debug arp
ip arp debug is on
Switch#Apr 19 15:59:42 2005 IP ARP: rcvd, type 1, src 192.168.2.100, 000A.EB5B.
780C, dst 192.168.2.1, 0000.0000.0000 flag 0x0.
Apr 19 15:59:42 2005 IP ARP: sent, type 2, src 192.168.2.1, 0003.0F02.310A, dst
192.168.2.100, 000A.EB5B.780C.
9.5.3.4.1.2 show arp
Command: show arp [<ip-addr>][<vlan-id>][<hw-addr>][type
{static|dynamic}][count] }
Function:
Displays the ARP table.
Parameters: