In this example the ghost server is on IP address 172.27.5.73/24 and is in vlan 205.
The ghostcasting clients (i.e. a workstation I want to re-ghost) is in vlan 240 on IP address: 172.27.240.10.
There are two DHCP servers also in vlan 205 on IP addresses 172.27.5.131 and 172.27.5.132.
We want the ghostcast client in vlan 240 to be able to be use both uni-cast and multi-cast (ghostcasting) sessions to the ghost server in vlan 205.
To do this the following is required on a cisco 6509 switch, however it should be the same for any other type of cisco switch running IOS.
interface vlan 1 ip igmp snooping querier ! interface Vlan205 ip pim sparse-dense-mode ! interface Vlan240 ip helper-address 172.27.5.73 ip helper-address 172.27.5.131 ip helper-address 172.27.5.132 ip pim sparse-dense-mode !
Where 172.27.5.73 is the ip address of the ghost server.
The ip pim spare-dense-mode needs to go on each VLAN that ghostcasting will be used on.
Its also worth noting that the “ip helper-address” command is used to forward the broadcasts for DHCP addresses to the DHCP servers (131 and 132), but is also required if you want the ghost session to automatically detect where the ghost server is without you needing to enter the IP address manually.