Re: uPRF strict more

On 9/29/21 02:47, Randy Bush wrote:

do folk use uPRF strict mode? i always worried about the multi-homed customer sending packets out the other way which loop back to me; see RFC 8704 §2.2

We do loose-mode for BGP customers, regardless of whether they are single- or multi-homed. We do loose-mode on transit routers, as they hold a full table. We do strict-mode for stub DIA customers. We do loose-mode for multi-homed DIA customers. We don't do uRPF on peering routers, as they don't hold a full table.

do vendors implement the complexity of 8704; and, if so, do operators use it?

Juniper support Feasible Paths, and we use it with no issue. We don't use Cisco in this role anymore, so not sure. Mark.