Router Alert Option and Router Alert Label
IP packets can have a Router Alert option appended to the IP header. This option is an IP option indicating that the router should inspect the packet further when forwarding the packet, even though the packet is not directly addressed to that router. The transit router for the packet should not just forward the packet by doing an IP lookup, but the router should inspect it further before forwarding it. What this inspection means is not defined and is up to the software implementation on the router. The Router Alert option is an IP option like the Timestamp, Loose Source Route, and Strict Source Route options are. The Router Alert option is defined in RFC 2113. An IP option is encoded as a Type Length ...
Get MPLS Fundamentals now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
