Monitoring DHCP Bindings (Displaying IP Address-to-MAC Address Bindings)

Purpose

Display the mapping between the assigned IP address and the MAC address of the subscriber’s computer.

Note: This command is deprecated and might be removed completely in a future release. The function provided by this command has been replaced by the show dhcp binding command.

Action

To display the DHCP IP address to MAC address bindings:

host1#show ip dhcp-external binding
                       Dhcp External Bindings                        
                       ----------------------                        
   Hardware       Giaddr    IpAddress    Server    Lease   Expire    Interface  
--------------   --------   ---------   --------   -----   ------   ------------
7000.0001.9365   91.3.0.1   91.3.0.2    10.1.2.1   3600    3175     ATM3/1.100.1

Meaning

Table 116 lists the show ip dhcp-external binding command output fields

Table 116: show ip dhcp-external binding Output Fields

Field Name

Field Description

Hardware

MAC address of subscriber’s computer

Giaddr

Gateway IP address (giaddr) in the DHCP packet received from a client

IpAddress

Subscriber client’s IP address

Server

DHCP server’s address

Lease

Time for which the IP address is available, in seconds

Expire

Time remaining on the current lease, in seconds

Interface

Interface that is associated with the subscriber’s computer

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