DHCP POOL EXHAUSTED - Cisco 2921 Version 15.0(1)M6

[v.petroff941]

Hi,

I had changed the network on a DHCP pool and the pool in not giving addresses. When I debug on the Cisco 2921 i see the following output:

000188: Jan 24 2018 12:35:28.223 EET: DHCPD: Sending notification of DISCOVER:
000189: Jan 24 2018 12:35:28.223 EET: DHCPD: htype 1 chaddr 0c11.6781.36f7
000190: Jan 24 2018 12:35:28.223 EET: DHCPD: remote id 020a00000a19700102000070
000191: Jan 24 2018 12:35:28.223 EET: DHCPD: circuit id 00000000
000192: Jan 24 2018 12:35:28.223 EET: DHCPD: Seeing if there is an internally specified pool class:
000193: Jan 24 2018 12:35:28.223 EET: DHCPD: htype 1 chaddr 0c11.6781.36f7
000194: Jan 24 2018 12:35:28.223 EET: DHCPD: remote id 020a00000a19700102000070
000195: Jan 24 2018 12:35:28.223 EET: DHCPD: circuit id 00000000
000196: Jan 24 2018 12:35:28.223 EET: DHCPD: subnet [10.25.112.1,10.25.112.254] in address pool MUN-VOIP-DHCP-POOL is empty.
000197: Jan 24 2018 12:35:28.223 EET: DHCPD: Sending notification of ASSIGNMENT FAILURE:
000198: Jan 24 2018 12:35:28.223 EET: DHCPD: htype 1 chaddr 0c11.6781.36f7
000199: Jan 24 2018 12:35:28.223 EET: DHCPD: remote id 020a00000a19700102000070
000200: Jan 24 2018 12:35:28.223 EET: DHCPD: circuit id 00000000
000201: Jan 24 2018 12:35:28.223 EET: DHCPD: Sending notification of ASSIGNMENT_FAILURE:
000202: Jan 24 2018 12:35:28.223 EET: DHCPD: due to: POOL EXHAUSTED
000203: Jan 24 2018 12:35:28.223 EET: DHCPD: htype 1 chaddr 0c11.6781.36f7
000204: Jan 24 2018 12:35:28.223 EET: DHCPD: remote id 020a00000a19700102000070
000205: Jan 24 2018 12:35:28.223 EET: DHCPD: circuit id 00000000
000206: Jan 24 2018 12:35:30.531 EET: DHCPD: Sending notification of DISCOVER:
000207: Jan 24 2018 12:35:30.531 EET: DHCPD: htype 1 chaddr 6400.f17e.5be0
000208: Jan 24 2018 12:35:30.531 EET: DHCPD: remote id 020a00000a19700102000070
000209: Jan 24 2018 12:35:30.531 EET: DHCPD: circuit id 00000000
000210: Jan 24 2018 12:35:30.531 EET: DHCPD: Seeing if there is an internally specified pool class:
000211: Jan 24 2018 12:35:30.531 EET: DHCPD: htype 1 chaddr 6400.f17e.5be0
000212: Jan 24 2018 12:35:30.531 EET: DHCPD: remote id 020a00000a19700102000070
000213: Jan 24 2018 12:35:30.531 EET: DHCPD: circuit id 00000000
000214: Jan 24 2018 12:35:30.531 EET: DHCPD: subnet [10.25.112.1,10.25.112.254] in address pool MUN-VOIP-DHCP-POOL is empty.
000215: Jan 24 2018 12:35:30.531 EET: DHCPD: Sending notification of ASSIGNMENT FAILURE:
000216: Jan 24 2018 12:35:30.531 EET: DHCPD: htype 1 chaddr 6400.f17e.5be0
000217: Jan 24 2018 12:35:30.531 EET: DHCPD: remote id 020a00000a19700102000070
000218: Jan 24 2018 12:35:30.531 EET: DHCPD: circuit id 00000000
000219: Jan 24 2018 12:35:30.531 EET: DHCPD: Sending notification of ASSIGNMENT_FAILURE:
000220: Jan 24 2018 12:35:30.531 EET: DHCPD: due to: POOL EXHAUSTED
000221: Jan 24 2018 12:35:30.531 EET: DHCPD: htype 1 chaddr 6400.f17e.5be0
000222: Jan 24 2018 12:35:30.531 EET: DHCPD: remote id 020a00000a19700102000070
000223: Jan 24 2018 12:35:30.531 EET: DHCPD: circuit id 00000000
000224: Jan 24 2018 12:35:30.843 EET: NTP Core (INFO): system event 'event_peer/strat_chg' (0x04) status 'sync_alarm, sync_ntp, 5 events, event_clock_reset' (0xC655)
000225: Jan 24 2018 12:35:30.843 EET: NTP Core (INFO): synchronized to 10.254.1.1, stratum 4
000226: Jan 24 2018 12:35:30.843 EET: NTP Core (INFO): system event 'event_sync_chg' (0x03) status 'leap_none, sync_ntp, 6 events, event_peer/strat_chg' (0x664)
000227: Jan 24 2018 12:35:30.843 EET: NTP Core (NOTICE): Clock is synchronized.
000228: Jan 24 2018 12:35:30.843 EET: NTP Core (INFO): system event 'event_peer/strat_chg' (0x04) status 'leap_none, sync_ntp, 7 events, event_sync_chg' (0x673)
000229: Jan 24 2018 12:35:31.287 EET: DHCPD: Sending notification of DISCOVER:
000230: Jan 24 2018 12:35:31.287 EET: DHCPD: htype 1 chaddr 6400.f1ab.2891
000231: Jan 24 2018 12:35:31.287 EET: DHCPD: remote id 020a00000a19700102000070
000232: Jan 24 2018 12:35:31.287 EET: DHCPD: circuit id 00000000
000233: Jan 24 2018 12:35:31.287 EET: DHCPD: Seeing if there is an internally specified pool class:
000234: Jan 24 2018 12:35:31.287 EET: DHCPD: htype 1 chaddr 6400.f1ab.2891

I will appreciate a little support :)

[Mark Malone]

Hi
Are you excluding anything in the range , do you have a screenshot of the DHCP pool setup
currently whats used in the pool , is it on a Cisco device or MS server or Linux

[v.petroff941]

Configurations:

ip dhcp excluded-address 10.25.112.1 10.25.112.10

!

ip dhcp pool MUN-VOIP-DHCP-POOL
network 10.25.112.0 255.255.255.0
option 150 ip 10.252.1.5 10.252.1.6
default-router 10.25.112.1
lease infinite

!

!
interface GigabitEthernet0/2.112
description ### LAN_DIST_VoIP ###
encapsulation dot1Q 112
ip address 10.25.112.1 255.255.255.0
no ip unreachables
no ip proxy-arp
no cdp enable
!

The pool is used as you can see for Cisco IP Phones.

[Leo Laohoo]

---

@v.petroff941 wrote:

lease infinite

---

Uhhhhh ... This is probably why your DHCP pool is exhausted.

[v.petroff941]

I had removed the "lease infinite", delete the pool and create it again but the result is the same...

[Leo Laohoo]

---

@v.petroff941 wrote:
I had removed the "lease infinite", delete the pool and create it again but the result is the same...

---

And how many phones are there total?

[Mark Malone]

Try re-add the whole pool and re-add exclude range and restart the the dhcp service on the router
service dhcp

[v.petroff941]

I did that but instead to restart the DHCP service I restarted the router :) ... didn't helped

[Leo Laohoo]

If you've changed the DHCP pool did you clear out the pool?

[v.petroff941]

Yes, I did but didn't helped.

[Mark Malone]

Incase any of the users are holding their ips check show ip dhcp conflict
i presume if you give them a static from same pool it works ok yes
if you create another pool as a test does it work or is it just isolated to this particular pool

[v.petroff941]

The IP Phones are taking their IP addresses dynamically from the pool. After I changed the network in the pool I did factory reset on the phones but didn't helped, also.
There are no conflicts... it is very strange. The router is without support, so I cannot open TAC case. I have searched for bugs but I could't find anything...

[Leo Laohoo]

How many phones are meant to be using this pool?

Download a free IP address "sweeper", like AngryIP.  Sweep the subnet range.  See how many responsd.

[v.petroff941]

No more than 10 IP Phones. At this point the phones are with static IP addresses from that pool and everything works. If I use the scan no one will reply from the old network.

[Mark Malone]

what happens if you reverse the change and put the old pool back does that work ?

just wondering if somethings been triggered in software as it sounds like you have tried everything , i dont even see your software available anymore looks like its from around 2013 so might be worth taking an upgrade anyway to a newer release that's suggested , if nothing else works