topic Re: 7921 not getting ip in Wireless

7921 not getting ip

mirehteshamali — Sun, 04 Jul 2021 07:30:12 GMT

Hi team ,

we have cisco 1240 AP's managed via wlc's but our cisco 7921 phones are not getting any ip ..it says configuring ip ..dhcp timeout . i am not sure how i can troubleshoot this issue . our dhcp server is configured on core switch itself. now i know the problem i just need to know how to proceed .

Re: 7921 not getting ip

Scott Fella — Wed, 24 Jul 2013 11:14:54 GMT

If you connect a laptop to the same SSID, do you get an IP address?

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Re: 7921 not getting ip

Viten Patel — Wed, 24 Jul 2013 18:56:04 GMT

Whats the config like? Who is the dhcp server? Just the phone not getting an ip?

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Re: 7921 not getting ip

mmangat — Thu, 25 Jul 2013 04:10:15 GMT

Hello,

It could be that DHCP failed because the encryption between the access point and phone do not match.

For more clarity please refer to the troubleshooting guide for 7921:

http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7921g/6_0/english/administration/guide/7921trb.pdf

Re: 7921 not getting ip

mirehteshamali — Thu, 25 Jul 2013 08:09:00 GMT

we are using wcs to manage 4404 controllers . we have three 4404 at our main site and a separate controller at branch offices.

when i tried to make configs in controllers via wcs and restart them , individually via wcs we loose our PSK. and wireless network goes down.

ie from wcs --> configure -->controller--> select controller ip --> .... and make configs

i have to go to DataCenter and do a hard reboot . and use " template " utility to restore our PSK.

is this a known issue , wcs is having 6.x .

Dhcp server is on core switch . AP's are connected to access layer sw. i can ping from controller to core switch

i will try the following .. use template config utility and change VOICE ssid to broadcast , then set auth to none and try with my laptops.

Re: 7921 not getting ip

Scott Fella — Thu, 25 Jul 2013 21:58:07 GMT

I don't like to push templates out. There are some templates that I would push out, but sending a template with preshared key or shared secrets have had issues. Make the changes manually on each WLC.

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Re: 7921 not getting ip

mirehteshamali — Sat, 27 Jul 2013 12:36:20 GMT

Certainly i am making some mistake. my laptops also dont get ip address. When i give static ip to 7291 every thing works.

i have configured " interface " as wireless-telephony .

associated it with SSID.

Under the interface i have assigned correct dhcp server ip address . it is our hsrp ip address .

under core switches i did make a pool , with DG , DNS , tftp server ip address. etc

applied and saved the configs

controller can ping , DHCP server .

i am not sure what else i have to do ... your help will be appreciated

Re: 7921 not getting ip

Scott Fella — Sat, 27 Jul 2013 12:42:29 GMT

Try to remove the dhcp proxy from the WLC and see if that helps. You need to be able to get dhcp from a wired client first before you can get the wireless to work. Makes sure you set an IP helper also. Maybe it's an issue with using the hsrp address. Try using the management of the switch.

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Re: 7921 not getting ip

Scott Fella — Sat, 27 Jul 2013 12:45:20 GMT

Also make sure that the core has a split scope. This will prevent duplicate address.

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