Command:

show ip arp

Mode:

Router#


Syntax:

show ip arp [ip-address] [hostname] [mac-address] [type number]


Syntax Description:

ip-address

(Optional) ARP entries matching this IP address are displayed.

hostname

(Optional) Host name.

mac-address

(Optional) 48-bit MAC address.

type number

(Optional) ARP entries learned via this interface type and number are displayed.

 


Command Description:

To display the Address Resolution Protocol (ARP) cache, where SLIP addresses appear as permanent ARP table entries, use the show ip arp EXEC command.

ARP establishes correspondences between network addresses (an IP address, for example) and LAN hardware addresses (Ethernet addresses). A record of each correspondence is kept in a cache for a predetermined amount of time and then discarded.

 


Example:

The following is a sample of output from the show ip arp command:

Router#show ip arp


Protocol  Address       Age(min)  Hardware Addr  Type   Interface
Internet  171.69.233.22 9       0000.0c59.f892 ARPA   Ethernet0/0
Internet  171.69.233.21 8       0000.0c07.ac00 ARPA   Ethernet0/0
Internet  171.69.233.19 -       0000.0c63.1300 ARPA   Ethernet0/0
Internet  171.69.233.30 9       0000.0c36.6965 ARPA   Ethernet0/0
Internet  172.19.168.11 -       0000.0c63.1300 ARPA   Ethernet0/0
Internet  172.19.168.254        9       0000.0c36.6965 ARPA   Ethernet0/0
 

The table describes significant fields shown in the display.

Table: show ip arp Field Descriptions

Field Description

Protocol

Protocol for network address in the Address field

Address

The network address that corresponds to Hardware Address

Age (min)

Age, in minutes, of the cache entry. A hyphen (-) means the address is local

Hardware Addr

LAN hardware address a MAC address that corresponds to network address

Type

Type of encapsulation:

  •  

  • ARPA�Ethernet
  • SNAP�RFC 1042
  • SAP�IEEE 802.3

     

Interface

Interface to which this address mapping has been assigned


Misconceptions:

None

Related commands:
None

� Cisco Systems, Inc. 2001, 2002, 2003
World Wide Education

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