3Com WX1200 3CRWX120695A manual Managing the ARP, IP address to the ARP table, Entries

130CHAPTER 6: CONFIGURING AND MANAGING IP INTERFACES AND SERVICES

Managing the ARP	The Address Resolution Protocol (ARP) table maps IP addresses to MAC
Table	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.

Displaying ARP Table To display ARP table entries, use the following command:

Entries	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).