I need to disable DHCP propagation in 2 connected sites and i have this scenario.
I have Site Q and Site A.in each we have DHCP Server.
Site Q has subnet 197.169.1.0 255.255.255.0
Site A has subnet 192.168.0.0 255.255.255.0
in Site A we have DHCP Server 192.168.0.50
in Site Q we have DHCP Server 197.169.1.220
these 2 sites are connected together in this way:
SiteQ(3com Switch) is connected to port gi0/20 on core switch(3650) with this configuration on the port of core switch:
interface GigabitEthernet0/20
switchport access vlan 197
switchport mode access
spanning-tree portfast
we have different Vlans:
vlan 197 with these configuration
interface Vlan197
ip address 197.169.1.237 255.255.255.0
ip helper-address 197.169.1.220
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi0/24, Gi0/25, Gi0/37, Gi0/49
Gi0/51, Gi0/52
2 Management active
3 Servers active
4 Voice active Gi0/1, Gi0/2, Gi0/4, Gi0/5
Gi0/6, Gi0/7, Gi0/8, Gi0/9
Gi0/10, Gi0/11, Gi0/12, Gi0/13
Gi0/14, Gi0/16, Gi0/17, Gi0/18
Gi0/19, Gi0/21, Gi0/22, Gi0/23
Gi0/28, Gi0/29, Gi0/30, Gi0/31
Gi0/32, Gi0/33, Gi0/34, Gi0/35
Gi0/36, Gi0/40, Gi0/41, Gi0/42
Gi0/43, Gi0/46
5 Data active
10 Video active
100 Wireless_Staff active
101 Wireless_Guest active
102 Wireless_Voice active
197 Old_Servers active Gi0/1, Gi0/2, Gi0/4, Gi0/5
Gi0/6, Gi0/7, Gi0/8, Gi0/9
Gi0/10, Gi0/11, Gi0/12, Gi0/13
Gi0/14, Gi0/16, Gi0/17, Gi0/18
Gi0/19, Gi0/20, Gi0/21, Gi0/22
Gi0/23, Gi0/26, Gi0/28, Gi0/29
Gi0/30, Gi0/31, Gi0/32, Gi0/33
Gi0/34, Gi0/35, Gi0/36, Gi0/40
Gi0/41, Gi0/42, Gi0/43
now what is happening that some computers on subnet 197.169.1.0 getting 192.168.0.0 ip address which means it is taking ip address from other site.we dont need that scenario keeping into attention that 2 sites still need to see each other but DHCP must not be active from site to site.
what can we do to solve this issue.if you need more details about configuration i can offer it.
