show ip arp
show ip arp [ip-address] [hostname] [mac-address] [type number]
(Optional) ARP entries matching this IP address are displayed.
(Optional) Host name.
(Optional) 48-bit MAC address.
(Optional) ARP entries learned via this interface type and number are displayed.
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.
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 22.214.171.124 9 0000.0c59.f892 ARPA Ethernet0/0 Internet 126.96.36.199 8 0000.0c07.ac00 ARPA Ethernet0/0 Internet 188.8.131.52 - 0000.0c63.1300 ARPA Ethernet0/0 Internet 184.108.40.206 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
Protocol for network address in the Address field
The network address that corresponds to Hardware Address
Age, in minutes, of the cache entry. A hyphen (-) means the address is local
LAN hardware address a MAC address that corresponds to network address
Type of encapsulation:
- SNAP�RFC 1042
- SAP�IEEE 802.3
Interface to which this address mapping has been assigned
� Cisco Systems, Inc. 2001, 2002, 2003
World Wide Education
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