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14-23
Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 14 Completing Interface Configuration (Routed Mode)
Monitoring Interfaces
• Lease Expiration—Shows the date that the DHCP lease expires. The lease indicates how long the
client can use the assigned IP address. Remaining time is also specified in the number of seconds
and is based on the timestamp in the Last Updated display-only field.
• Number of Active Leases—Shows the total number of DHCP leases.
• Refresh—Refreshes the information from the ASA.
• Last Updated—Shows when the data in the table was last updated.
DHCP Client Lease Information
If you obtain the ASA interface IP address from a DHCP server, the Monitoring > Interfaces > DHCP >
DHCP Server Table > DHCP Client Lease Information pane shows information about the DHCP lease.
Fields
• Select an interface—Lists the ASA interfaces. Choose the interface for which you want to view the
DHCP lease. If an interface has multiple DHCP leases, then choose the interface and IP address pair
you want to view.
• Attribute and Value—Lists the attributes and values of the interface DHCP lease.
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Temp IP addr—Display only. The IP address assigned to the interface.
–
Temp sub net mask—Display only. The subnet mask assigned to the interface.
–
DHCP lease server—Display only. The DHCP server address.
–
state—Display only. The state of the DHCP lease, as follows:
Initial—The initialization state, where the ASA begins the process of acquiring a lease. This
state is also shown when a lease ends or when a lease negotiation fails.
Selecting—The ASA is waiting to receive DHCPOFFER messages from one or more DHCP
servers, so it can choose one.
Requesting—The ASA is waiting to hear back from the server to which it sent its request.
Purging—The ASA is removing the lease because of an error.
Bound—The ASA has a valid lease and is operating normally.
Renewing—The ASA is trying to renew the lease. It regularly sends DHCPREQUEST messages
to the current DHCP server, and waits for a reply.
Rebinding—The ASA failed to renew the lease with the original server, and now sends
DHCPREQUEST messages until it gets a reply from any server or the lease ends.
Holddown—The ASA started the process to remove the lease.
Releasing—The ASA sends release messages to the server indicating that the IP address is no
longer needed.
–
Lease—Display only. The length of time, specified by the DHCP server, that the interface can
use this IP address.
–
Renewal—Display only. The length of time until the interface automatically attempts to renew
this lease.
–
Rebind—Display only. The length of time until the ASA attempts to rebind to a DHCP server.
Rebinding occurs if the ASA cannot communicate with the original DHCP server, and 87.5
percent of the lease time has expired. The ASA then attempts to contact any available DHCP
server by broadcasting DHCP requests.