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Cisco 2921 seems to be excluding addresses from DHCP pool?

Posted on 2014-08-21
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Last Modified: 2014-09-10
I have a cisco 2921 with several DHCP pools that seems to be giving me a hard time.  I recently started having issues without it not handing out addressses.  I assumed it had run out of addresses as had handed out some of them.  When I checked the bindings there were plenty of addresses left, say 20 out of 50 for a particular pool.  I added on to the pool by excluding fewer addresses and it immediately starting handing out from that range.

ip multicast-routing
ip dhcp excluded-address 172.30.22.200 172.30.22.254
ip dhcp excluded-address 172.30.23.200 172.30.23.254
ip dhcp excluded-address 192.168.4.1 192.168.4.50
ip dhcp excluded-address 192.168.4.100 192.168.4.255
ip dhcp excluded-address 192.168.3.1 192.168.3.50
ip dhcp excluded-address 192.168.3.100 192.168.3.170
ip dhcp excluded-address 192.168.3.195 192.168.3.255
!
ip dhcp pool Ewald_Chev_Phones
 network 172.30.22.0 255.255.255.0
 option 150 ip 206.22.225.225
 default-router 172.30.22.254
!
ip dhcp pool Ewald_Chrysler_Phones
 network 172.30.23.0 255.255.255.0
 option 150 ip 206.22.225.225
 default-router 172.30.23.254
!
ip dhcp pool CLIENT-Chev
 network 192.168.3.0 255.255.255.0
 default-router 192.168.3.1
 netbios-name-server 192.168.1.26
 dns-server 69.130.45.228
!
ip dhcp pool CLIENT-Chry
 network 192.168.4.0 255.255.255.0
 default-router 192.168.4.1
 netbios-name-server 192.168.1.26
 dns-server 69.130.45.228
!
ip dhcp pool STATIC1
 host 192.168.3.51 255.255.255.0
 client-identifier 018c.a982.3dfb.e6
!
ip dhcp pool STATIC2
 host 192.168.3.52 255.255.255.0
 client-identifier 0160.eb69.fc35.a6
!

Is the relevant DHCP portion of my config.  I turned on DHCP debugging in hopes of finding out why it wasnt handing out addresses and I am getting a lot of the below.

Aug 21 17:10:53.082 CST: DHCPD: excluded address: 172.30.23.24
Aug 21 17:10:53.082 CST: DHCPD: Seeing if there is an internally specified pool class:
Aug 21 17:10:53.082 CST:   DHCPD: htype 1 chaddr 000e.d748.5108
Aug 21 17:10:53.086 CST:   DHCPD: remote id 020a0000ac1e17fe000000c9
Aug 21 17:10:53.086 CST:   DHCPD: circuit id 00000000
 --More--
Aug 21 17:11:00.906 CST: DHCPD: excluded address: 172.30.22.78
Aug 21 17:11:00.906 CST: DHCPD: Seeing if there is an internally specified pool class:
Aug 21 17:11:00.906 CST:   DHCPD: htype 1 chaddr 000d.bc04.7b07
Aug 21 17:11:00.906 CST:   DHCPD: remote id 020a0000ac1e16fe000000c8
Aug 21 17:11:00.906 CST:   DHCPD: circuit id 00000000
 --More--
Aug 21 17:11:02.490 CST: DHCPD: excluded address: 172.30.23.22
Aug 21 17:11:02.490 CST: DHCPD: Seeing if there is an internally specified pool class:
Aug 21 17:11:02.490 CST:   DHCPD: htype 1 chaddr 000d.bdd6.aa45
Aug 21 17:11:02.490 CST:   DHCPD: remote id 020a0000ac1e17fe000000c9
Aug 21 17:11:02.490 CST:   DHCPD: circuit id 00000000
 --More--
Aug 21 17:11:09.358 CST: DHCPD: excluded address: 172.30.23.25
Aug 21 17:11:09.358 CST: DHCPD: Seeing if there is an internally specified pool class:
Aug 21 17:11:09.358 CST:   DHCPD: htype 1 chaddr 000e.d74c.f76b
Aug 21 17:11:09.358 CST:   DHCPD: remote id 020a0000ac1e17fe000000c9
Aug 21 17:11:09.358 CST:   DHCPD: circuit id 00000000
Aug 21 17:11:09.906 CST: DHCPD: excluded address: 172.30.23.29
Aug 21 17:11:09.906 CST: DHCPD: Seeing if there is an internally specified pool class:
Aug 21 17:11:09.906 CST:   DHCPD: htype 1 chaddr 000e.3833.9db5
Aug 21 17:11:09.906 CST:   DHCPD: remote id 020a0000ac1e17fe000000c9
Aug 21 17:11:09.906 CST:   DHCPD: circuit id 00000000
 --More--
Aug 21 17:11:18.122 CST: DHCPD: excluded address: 172.30.22.75
Aug 21 17:11:18.122 CST: DHCPD: Seeing if there is an internally specified pool class:
Aug 21 17:11:18.122 CST:   DHCPD: htype 1 chaddr 000e.d759.0f66
Aug 21 17:11:18.122 CST:   DHCPD: remote id 020a0000ac1e16fe000000c8
Aug 21 17:11:18.122 CST:   DHCPD: circuit id 00000000


The pool that was the issues was the 192.168.3.0/24
The messages are from one of the other pools and I am not sure if they are related but I am confused as to why messages similar to the ones above are constantly showing up as the addresses are not exculded from the pools by the config?
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Question by:joshparker
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Expert Comment

by:eeRoot
ID: 40279970
Are these two pools in the same subnet?  Are they both being used?

ip dhcp pool STATIC1
 host 192.168.3.51 255.255.255.0
 client-identifier 018c.a982.3dfb.e6
!
ip dhcp pool STATIC2
 host 192.168.3.52 255.255.255.0
 client-identifier 0160.eb69.fc35.a6
0
 

Author Comment

by:joshparker
ID: 40282887
Yes those are two reservations I have setup.
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LVL 22

Accepted Solution

by:
eeRoot earned 1000 total points
ID: 40284749
At this point, you'll want to use the "show ip dhcp pool? command to see how many IP address have been handed out and how many are still available.  It sounds like one or more of the DHCP scopes have are being used up.
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Author Closing Comment

by:joshparker
ID: 40314347
Didn't solve my issue but I appreciate the help.
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