Displaying Address Table Entries; Managing The Arp Table - Cisco WS-C3560-48PS-S Software Configuration Manual
Software configuration guide
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- Hardware installation manual (120 pages)
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Managing the ARP Table
Displaying Address Table Entries
You can display the MAC address table by using one or more of the privileged EXEC commands
described in
Table 6-4
Commands for Displaying the MAC Address Table
Command
show mac address-table address
show mac address-table aging-time
show mac address-table count
show mac address-table dynamic
show mac address-table interface
show mac address-table multicast
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 determine the 48-bit
MAC or the local data link address of that device. The process of determining 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. Taking an IP address as input, ARP determines the associated MAC
address. Once a MAC address is determined, 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, refer to the Cisco IOS Release 12.1 documentation on Cisco.com.
Catalyst 3560 Switch Software Configuration Guide
6-28
Table
6-4:
Description
Displays MAC address table information for the specified MAC address.
Displays the aging time in all VLANs or the specified VLAN.
Displays the number of addresses present in all VLANs or the specified VLAN.
Displays only dynamic MAC address table entries.
Displays the MAC address table information for the specified interface.
Displays the Layer 2 multicast entries for 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 6
Administering the Switch
78-16156-01
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