06-15-2014 09:13 AM - edited 03-04-2019 11:09 PM
Hi Friends,
I am facing an issue with DHCP.
I have configured dhcp on my distribution switch.(4507), for Access Points.
I have configured the interface as below;
interface fa5/35
description to AP
switchport mode trunk
switchport trunk native vlan 777
no shutdown
Now my switch is leasing ip address to the APs, but it is continuously renewing the IP addresses every 20 to 30 seconds.
I checked the interfaces, they are stable.
My DHCP configuration is as below;
Ip dhcp pool AP_MGMT
Network 192.168.77.0 255.255.255.0
Default-network 192.168.77.100
option 43 ip 10.1.2.60
Please advice.
06-15-2014 10:35 AM
Is it a new request from the AP that is causing the frequent renew of the lease?
HTH
Rick
06-15-2014 09:53 PM
I suppose that the AP is sending a new request. Coz, I have three dhcp pools there and none of them is having this problem.
And the interfaces where APs are connected are also consistent.
I din't get a chance for debug. Once I get it, I will update you.
Thank you for the reply.
10-19-2014 04:32 AM
Sorry for the late update.
The controller was not reachable from the AP's IP address. Had to change the Firewall rule to get it work.
10-19-2014 06:07 PM
Thanks for posting back to the forum to tell us that you have resolved the problem and that it required a change in the firewall rules to get it to work.
HTH
Rick
06-16-2014 04:25 AM
Most likely has nothing to do with the problem but why do you use VLAN tagging (trunk mode) on a port to an AP. Seems even stranger when seeing that you provide a native VLAN thus indicating that the device on that port is not able to understand the tagged packets.
I would suggest to change the config of the port to:
description AP
switchport mode access
switchport access vlan 777
06-16-2014 04:41 AM
I am sorry that I din't mention I am using flexconnect mode.
The APs are in my branch offices.
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