03-17-2010 12:58 AM - edited 03-06-2019 10:10 AM
Hello Guys,
I have Two routers are configured with HSRP and have DHCP POOL configured on Both Rotuer1 and Router2 .
All the user clients are getting ip from DHCP from same network.
Rotuer1:
ip dhcp excluded-address 10.120.101.141 10.120.101.254
ip dhcp excluded-address 10.120.102.141 10.120.102.254
ip dhcp excluded-address 10.120.201.141 10.120.201.254
ip dhcp excluded-address 10.120.251.141 10.120.251.254
ip dhcp excluded-address 10.120.101.1 10.120.101.10
ip dhcp excluded-address 10.120.102.1 10.120.102.10
ip dhcp excluded-address 10.120.201.1 10.120.201.10
!
ip dhcp pool voice
network 10.120.201.0 255.255.255.0
default-router 10.120.201.1 255.255.255.0
dns-server 10.1.200.22 10.1.200.23
option 150 ip 10.120.201.2
domain-name wr
!
ip dhcp pool data
network 10.120.101.0 255.255.255.0
default-router 10.120.101.1
dns-server 10.1.200.22 10.1.200.23
netbios-name-server 10.1.200.22 10.1.200.23
domain-name ***
netbios-node-type h-node
lease 10
ip dhcp pool data-vlan102
network 10.120.102.0 255.255.255.0
default-router 10.120.102.1 255.255.255.0
dns-server 10.1.200.22 10.1.200.23
netbios-name-server 10.1.200.22 10.1.200.23
domain-name ***
netbios-node-type h-node
lease 7
!
Router2:-
ip dhcp excluded-address 10.120.101.1 10.120.101.140
ip dhcp excluded-address 10.120.102.1 10.120.102.140
ip dhcp excluded-address 10.120.201.1 10.120.201.140
ip dhcp excluded-address 10.120.251.1 10.120.251.140
!
ip dhcp pool voice
network 10.120.201.0 255.255.255.0
default-router 10.120.201.1 255.255.255.0
option 150 ip 10.120.201.2
dns-server 10.1.200.22 10.1.200.23
domain-name wr
!
ip dhcp pool data
network 10.120.101.0 255.255.255.0
default-router 10.120.101.1 255.255.255.0
dns-server 10.1.200.22 10.1.200.23
netbios-name-server 10.1.200.22 10.1.200.23
domain-name ***
netbios-node-type h-node
lease 7
ip dhcp pool data-vlan102
network 10.120.102.0 255.255.255.0
default-router 10.120.102.1 255.255.255.0
dns-server 10.1.200.22 10.1.200.23
netbios-name-server 10.1.200.22 10.1.200.23
domain-name ***
netbios-node-type h-node
lease 7
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Router1 DHCP error messages:-
Mar 12 06:07:58.494: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict: client 0100.1e90.3718.55 declined 10.120.101.72.
Mar 15 03:48:38.191: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.74.
Mar 15 04:11:27.029: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict: client 0100.123f.ab84.dc declined 10.120.101.59.
Mar 15 04:48:04.047: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.101.
Mar 15 04:48:05.047: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.105.
Mar 15 04:48:06.083: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.115.
Mar 15 04:48:07.083: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.116.
Mar 15 04:48:08.083: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.117.
Mar 16 03:20:48.220: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict: client 0100.2197.3b50.e4 declined 10.120.101.37.
Mar 16 04:20:08.907: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.123.
Mar 16 04:20:09.907: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.126.
Mar 16 04:44:36.990: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.101.134.
Mar 16 21:37:46.021: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.201.69.
Mar 16 21:37:47.021: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.201.70.
Router1 -DHCP BINDINGS:-
sh ip dhc binding
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
Hardware address/
User name
10.120.101.11 0100.1e68.5fe9.50 Mar 27 2010 10:59 AM Automatic
10.120.101.13 0100.1e90.3718.55 Mar 24 2010 09:54 AM Automatic
10.120.101.14 0100.1f3b.4c28.5f Mar 27 2010 10:59 AM Automatic
10.120.101.16 0100.1bd4.0c34.de Mar 27 2010 06:42 AM Automatic
10.120.101.21 0100.1372.d191.a4 Mar 27 2010 06:42 AM Automatic
10.120.101.36 0100.2163.2570.c1 Mar 27 2010 10:49 AM Automatic
10.120.101.40 0100.16ea.dc12.06 Mar 25 2010 08:12 AM Automatic
10.120.101.43 0100.13e8.ef6a.a9 Mar 27 2010 07:32 AM Automatic
10.120.101.46 0100.1e68.bfb5.34 Mar 25 2010 06:33 PM Automatic
10.120.101.59 0100.1de0.0f91.1b Mar 27 2010 09:54 AM Automatic
10.120.101.76 0100.16ea.dc27.1a Mar 27 2010 10:09 AM Automatic
10.120.101.81 0100.123f.ab84.dc Mar 26 2010 11:46 AM Automatic
10.120.101.98 0100.1302.cd03.22 Mar 27 2010 10:14 AM Automatic
10.120.101.121 0100.1921.3c3b.c4 Mar 26 2010 03:07 AM Automatic
10.120.101.122 0100.2197.3b50.e4 Mar 26 2010 07:21 AM Automatic
10.120.101.133 0100.2197.3b50.d2 Mar 26 2010 08:20 AM Automatic
10.120.101.140 0100.123f.abad.ff Mar 27 2010 07:15 AM Automatic
10.120.102.71 0100.1185.ef5b.b8 Mar 22 2010 05:32 AM Automatic
10.120.201.27 0100.1bd4.0c3a.93 Mar 18 2010 09:58 AM Automatic
10.120.201.67 0100.1c58.5758.61 Mar 18 2010 05:28 AM Automatic
10.120.201.91 0100.1bd4.329e.20 Mar 18 2010 02:32 AM Automatic
10.120.201.101 0100.1bd4.0c41.e3 Mar 18 2010 04:10 AM Automatic
10.120.201.106 0100.1ebe.90e6.74 Mar 18 2010 04:14 AM Automatic
10.120.201.107 0100.1bd4.0c40.7d Mar 18 2010 04:14 AM Automatic
10.120.201.111 0100.1bd4.329e.dd Mar 18 2010 04:18 AM Automatic
10.120.201.127 0100.1c58.5758.e9 Mar 18 2010 09:40 AM Automatic
10.120.201.132 0100.1bd4.32ab.1a Mar 18 2010 02:02 AM Automatic
10.120.201.133 0100.1bd4.0c41.09 Mar 18 2010 02:02 AM Automatic
10.120.201.134 0100.1bd4.0c40.b4 Mar 18 2010 09:42 AM Automatic
Router 2 DHCP Error message:-
Feb 24 08:12:14.825 UAE: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.120.102.56.
Feb 28 06:53:46.795 UAE: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict: client 0100.1185.ef5b.b8 declined 10.120.102.171.
Feb 28 07:13:27.999 UAE: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict: client 0100.a0d1.2025.74 declined 10.120.101.33.
Mar 11 12:41:29.390 UAE: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict: client 0100.123f.cc8d.ab declined 10.120.102.173.
Mar 12 09:57:53.889 UAE: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict: client 0100.123f.ab84.dc declined 10.120.101.209.
Mar 13 12:18:38.204 UAE: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict: client 0100.1921.3c33.0e declined 10.120.102.176.
Router2 IP DHCP Bindings:
h ip dhcp binding
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
Hardware address/
User name
10.120.101.5 0100.1279.6875.2e Mar 23 2010 08:35 AM Automatic
10.120.101.38 0100.1372.d61c.33 Mar 23 2010 08:28 AM Automatic
10.120.101.62 0100.1e90.3719.0d Mar 22 2010 02:47 PM Automatic
10.120.101.67 0100.1921.3c37.bb Mar 22 2010 07:32 AM Automatic
10.120.101.145 0100.1921.3c78.fe Mar 24 2010 07:26 AM Automatic
10.120.101.150 0100.1e90.3a90.11 Mar 22 2010 04:17 PM Automatic
10.120.101.176 0100.1c7e.936d.23 Mar 21 2010 07:25 AM Automatic
10.120.101.190 0100.1c7e.eb40.20 Mar 24 2010 07:32 AM Automatic
10.120.101.192 0100.1921.3c74.d9 Mar 21 2010 07:26 AM Automatic
10.120.101.193 0100.1c7e.e840.20 Mar 24 2010 07:05 AM Automatic
10.120.101.199 0100.1921.3c37.4d Mar 23 2010 01:51 PM Automatic
10.120.101.200 0100.1921.3c00.28 Mar 21 2010 02:59 PM Automatic
10.120.101.201 0100.1921.3c3c.1a Mar 24 2010 06:54 AM Automatic
10.120.101.210 0100.1279.6878.fe Mar 21 2010 07:38 AM Automatic
10.120.101.219 0100.2197.253a.70 Mar 22 2010 09:51 AM Automatic
10.120.101.226 0100.1921.3c35.a5 Mar 21 2010 02:05 AM Automatic
10.120.101.230 0100.15b7.f515.54 Mar 22 2010 06:17 AM Automatic
10.120.101.235 0100.2197.224e.f7 Mar 24 2010 07:17 AM Automatic
10.120.101.237 0100.1c7e.8c2b.20 Mar 24 2010 09:54 AM Automatic
10.120.102.89 0100.1195.e259.46 Mar 22 2010 01:22 PM Automatic
10.120.102.177 0100.123f.cc8d.ab Mar 22 2010 12:41 AM Automatic
10.120.102.178 0100.1921.3c33.0e Mar 24 2010 12:18 AM Automatic
10.120.102.181 0100.0fb0.ddd7.35 Mar 23 2010 01:30 PM Automatic
10.120.201.4 0100.1d45.2c80.9a Mar 17 2010 01:32 PM Automatic
10.120.201.39 0100.1bd4.32b5.77 Mar 17 2010 11:31 AM Automatic
10.120.201.43 0100.1e7a.c4e0.df Mar 17 2010 11:33 AM Automatic
10.120.201.45 0100.1c58.1c8d.d3 Mar 17 2010 11:31 AM Automatic
10.120.201.51 0100.1bd4.330d.fd Mar 17 2010 12:20 PM Automatic
10.120.201.52 0100.1bd4.0c41.96 Mar 17 2010 11:35 AM Automatic
10.120.201.55 0100.1bd4.0c37.2e Mar 17 2010 11:31 AM Automatic
10.120.201.62 0100.1bd4.0c3a.d0 Mar 17 2010 11:32 AM Automatic
10.120.201.63 0100.1bd4.32bb.a5 Mar 17 2010 11:32 AM Automatic
10.120.201.64 0100.1bd4.0c4d.23 Mar 17 2010 11:32 AM Automatic
10.120.201.73 0100.1c58.5752.1d Mar 17 2010 01:15 PM Automatic
10.120.201.86 0100.1bd4.0c4b.33 Mar 17 2010 11:35 AM Automatic
10.120.201.87 0100.1c58.575d.b8 Mar 17 2010 11:31 AM Automatic
10.120.201.92 0100.1bd4.0c4f.28 Mar 17 2010 11:33 AM Automatic
10.120.201.94 0100.1bd4.0c4f.0a Mar 17 2010 11:32 AM Automatic
10.120.201.144 0100.1bd4.329b.f3 Mar 18 2010 03:34 AM Automatic
If you look at Router 2 IP DHCP bindings it is releasing ip address even of the excluse list of R2 DHCP Scope.
R1 - EXCLUDE SCOPE :- 10.120.101.141 - 10.120.101.254
R2 EXCLUDE SCOPE :- 10.120.101.1-140 .....but still R2 is giving ip's from excluse list.
Also I am not sure why these DHCP Conflicts and PING Conflict are keeping popping up, due to these my SCOPE is gettign fulled and my few client failed get IP address.
IS this some thing to do with this command no ip dhcp conflict logging needeedto resolve this issue?
Apprecaite all your efforts!
Regards,
KA.
03-17-2010 09:39 AM
Hello KA,
the following can be of help :
clear ip dhcp conflict ?
* Clear all address conflicts
A.B.C.D Clear a specific conflict
Hope to help
Giuseppe
03-17-2010 03:23 PM
Hello Giuslar,
Thanks for your posts!
I had tried the clear IP dhcp conflict ..command ..but its not resolving my issue permanantly.
Regards,
KA.
05-26-2014 02:17 AM
Try to divide pool on two parts /25. One part is one one router, second on the second router. The pool will be two times smaller but you can try to avoid conflicts between routers.
09-01-2015 02:27 AM
Hi what is best practice to have dhcp in core switch? are we just configure in 1 core? or we like you say this have to be make both core hold smaller segment of pool.
09-01-2015 02:53 AM
Hello
Try decreasing your DHCP lease values for voice and Data
res
Paul
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