In some cases, a 7750 SR can sit behind a Layer 3 device (such as an CMTS), where the router does not participate in client’s DHCP process. Such a use case is different from a normal WPP use case where the routers rely on getting client’s DHCP request to create an initial ESM host.
This feature allows the system to create an ESM host upon successful WPP authentication without creating an initial host.
In the above use case (behind a Layer 3 device) the user also needs to configure one or more default hosts on the SAP to allow HTTP redirection without an ESM host. The default-host subnet is the user’s source subnet and the next hop address is the Layer 3 device’s interface address that connect to the SAP. Users also need to configure the lease-populate l2-header command in the grp-if>dhcp context to make HTTP redirection with default-host work. The grp-if>dhcp context could be shut down in the meantime.
This feature does not work with wholesale/retail.