Client timeout for Cisco IOS Static DHCP Pool

answer

When configuring a static DHCP pool on a Cisco IOS device, it is important to consider the client timeout value. This value dictates how long a DHCP lease will remain in effect before being released and available to another client. Setting the timeout value too short can lead to IP address exhaustion, while setting it too long can lead to stale leases and unused IP addresses.

The client timeout value is configured as part of the DHCP pool configuration. The syntax is as follows:

ip dhcp pool [pool name]

client-timeout [time in minutes]

The time is set in minutes, with a default of 30 minutes. The time can range from 0 to 1440 minutes (24 hours).

The client timeout value determines the amount of time a client is allowed to keep an IP address before the lease is released. When the timeout value is reached, the client is sent a DHCP release packet and the IP address is freed up for another client to use. This ensures that IP address exhaustion does not occur due to clients holding on to IP addresses for too long.

However, setting the timeout value too low can lead to DHCP exhaustion as well. This is because the IP addresses in the pool are constantly being released and reassigned. If the timeout value is set too low, clients may not have enough time to request an IP address before it is released and reassigned to another client. In this case, the client will not be able to obtain an IP address and will be unable to access the network.

On the other hand, setting the timeout value too high can lead to stale leases and unused IP addresses. This is because clients may request an IP address but not use it, causing the IP address to remain in use but not actively being used. This will lead to IP address exhaustion in the long run as the pool of available IP addresses slowly dwindles.

Therefore, it is important to set the client timeout value to an appropriate value that ensures IP address exhaustion is avoided in both the short and long term. Generally, a client timeout value of 60 minutes is a good balance between avoiding IP address exhaustion and allowing clients enough time to request and use IP addresses.

In summary, when configuring a static DHCP pool on a Cisco IOS device, it is important to consider the client timeout value. This value dictates how long a DHCP lease will remain in effect before being released and available to another client. Setting the timeout value too short can lead to IP address exhaustion, while setting it too long can lead to stale leases and unused IP addresses. It is important to set the client timeout value to an appropriate value that ensures IP address exhaustion is avoided in both the short and long term. Generally, a client timeout value of 60 minutes is a good balance between avoiding IP address exhaustion and allowing clients enough time to request and use IP addresses.

Inquire Now

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Find your next full or part-time role here

ScaleDesk can either help you find your next full time gig or a part time side gig where you can create extra income!

Onboard with us once
Skip HR screening and go to the final interview with with only your resume and a video interview you never have to redo
Get paid electronically every month for the hours you work
We will be your reference even if you work for us once

IT Teams: Use ScaleDesk to augment your team

Schedule Demo