Lead Report / History

The Switch Could Not Decrement TTL. The Ingress Paid the Hop Count Up Front: RFC 3034
A Frame Relay switch could replace a DLCI at line rate yet lack the operation that routers performed on every packet: subtract one from time to live. RFC 3034 preserved MPLS loop and scope accounting by charging a propagated segment length at the boundary. The control plane supplied the number; the ingress performed the subtraction; neither fact alone proved the path a packet actually took.











