RSVP-TE daemon for DiffServ over MPLS under Linux Features, Components and Architecture

First of all the daemon supports the set up of Label Switched Paths (LSPs) in the network according to the IP routing tables or by explicitly specifying the hops to be traversed (shortest path LSPs and Explicitly Routed-LSPs respectively). There’s an RSVP API (RAPI), an API to aid developers to build custom applications that interact with the RSVP daemon. There is support for DiffServ allowing to differentiate the forwarding behavior based on the value in the EXP field of the MPLS header. There is also support for IntServ where resources are explicitly allocated on a per-LSP level. Traffic can be mapped on the LSPs very flexibly based on the destination address, protocol, destination ports and port ranges of the IP packets. There is also the ability to trace an LSP, comparable to IP’s traceroute. It checks the route taken by an LSP by probing the routers along the path. Resilience is also supported with LSP rerouting and LSP protection switching.