Managing The Arp Table - Cisco Catalyst 2960 Software Configuration Manual
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- Configuration manual (2288 pages) ,
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Managing the ARP Table
Table 5-3
Commands for Displaying the MAC Address Table (continued)
Command
show mac address-table dynamic
show mac address-table interface
show mac address-table learning
show mac address-table notification
show mac address-table static
show mac address-table vlan
Managing the ARP Table
To communicate with a device (over Ethernet, for example), the software first must learn the 48-bit MAC
address or the local data link address of that device. The process of learning the local data link address
from an IP address is called address resolution.
The Address Resolution Protocol (ARP) associates a host IP address with the corresponding media or
MAC addresses and the VLAN ID. Using an IP address, ARP finds the associated MAC address. When
a MAC address is found, the IP-MAC address association is stored in an ARP cache for rapid retrieval.
Then the IP datagram is encapsulated in a link-layer frame and sent over the network. Encapsulation of
IP datagrams and ARP requests and replies on IEEE 802 networks other than Ethernet is specified by
the Subnetwork Access Protocol (SNAP). By default, standard Ethernet-style ARP encapsulation
(represented by the arpa keyword) is enabled on the IP interface.
ARP entries added manually to the table do not age and must be manually removed.
For CLI procedures, see the Cisco IOS Release 12.4 documentation on Cisco.com.
Note
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
5-24
Description
Displays only dynamic MAC address table entries.
Displays the MAC address table information for the specified interface.
Displays MAC address learning status of all VLANs or the specified VLAN.
Displays the MAC notification parameters and history table.
Displays only static MAC address table entries.
Displays the MAC address table information for the specified VLAN.
Chapter 5
Administering the Switch
OL-26520-01
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