DHCP Lease on 3750

[yogesh1]

I have  multiple ip pools in dhcp. we are having 10 hours lease time in every pool please help me i want to dic lease time in every pool.

please help. how to change lease time in already runnig dhcp

[Francesco Molino]

Hi

To change the lease time, go to your dhcp scope on your switch.

If needed, you can issue the command "clear ip dhcp binding *" to force the switch to clear its binding table, but this wouldn't trigger any release/renew on the client side. You need to wait that DHCP packets are sent by clients (half time of the actual lease) to get updated with new lease timer.
You want to manually force clients getting the new DHCP lease tine, you'll need to force a manual release/renew on the client device.

[yogesh1]

thanks Francesco,

But I already have pools I just want to dic the lease time from 10 hr to 8 hr .

suppose I have a pool with name AC soo in config mode what command should I write to dic the pool lease time in this particular pool.

I think I go to confg mode and write

ip dhcp pool ac

no lease 0 10

lease 0 8

is this write if not please suggest me the actual command

[Francesco Molino]

Hi

The command is the right one. If you want 8 his then just issues the command "lease 0 8", no need to do no lease before.

[yogesh1]

.????

[Meheretab Mengistu · Accepted solution]

Your command is correct with one correction: there is no need to run "no lease 0 10" to remove 10 hours lease time. Simply run the new value "lease 0 8" and the lease time will be changed to 8 hours.

ip dhcp pool ac
lease 0 8
!

Remember that the existing leases will not be renewed automatically unless you do "release/renew" on end users (as Francesco mentioned above).

HTH,
Meheretab