26 Nov
2015
26 Nov
'15
12:34 a.m.
Well the requesting router could announce the route. ISC's client has hooks that allow this to be done. That is, after all, how routing is designed to work. The DHCP server usually is sitting in a data center on the other side of the country with zero ability to inject approptiate routes.
The DHCP relay could also have injected routes but that is a second class solution.
A CPE announcing the route is fine as long as the ISP controls the CPE. If the CPE is controled by the customer, then the ISP's problems are similar. They need to find a way to filter the CPE's announcement so that it can announce only the prefixes delegated to it. András