3com WX1200 3CRWX120695A User Manual

C

HAPTER

 6: C

ONFIGURING

 

AND

 M

ANAGING

 IP I

NTERFACES

 

AND

 S

ERVICES

The Address Resolution Protocol (ARP) table maps IP addresses to MAC 
addresses. An ARP entry enters the table in one of the following ways:

„

Added automatically by the WX switch. A switch adds an entry for its 
own MAC address and adds entries for addresses learned from traffic 
received by the WX switch. When the WX switch receives an IP 
packet, the switch adds the packet’s source MAC address and source 
IP address to the ARP table. 

„

Added by the system administrator. You can add dynamic, static, and 
permanent entries to the ARP table. 

ARP is enabled by default on a WX switch and cannot be disabled. 

To display ARP table entries, use the following command:

display arp [ip-addr]

Here is an example:

WX1200# display arp
ARP aging time: 1200 seconds

Host

HW Address

  VLAN  Type

 State

------------------------------ ----------------- ----- ------- --------
10.5.4.51

 00:0b:0e:02:76:f5

  1 DYNAMIC RESOLVED

10.5.4.53

 00:0b:0e:02:76:f7

  1 LOCAL

RESOLVED

This example shows two entries. The local entry (with LOCAL in the Type 
field) is for the WX switch itself. The MAC address of the local entry is the 
switch’s MAC address. The ARP table contains one local entry for each 
VLAN configured on the switch. The dynamic entry is learned from traffic 
received by the switch. The ARP table can also contain static and 
permanent entries, which are added by an administrator. The State field 
indicates whether an entry is resolved (RESOLVED) or whether MSS has 
sent an ARP request for the entry and is waiting for the reply 
(RESOLVING).