Abstract
A payload-aware extension to route target constrained route distribution lets a router advertise both the route target it wants routes for and a descriptor of the payload it needs, such as one Internet Protocol version, the other, or both. The descriptor travels inside the route target membership advertisement, so it propagates as a route rather than a session capability and reaches distant originating routers across any number of route reflector tiers. A route reflector merges the descriptors of its clients by bitwise union into one request advertised upstream, and applies each client's descriptor as an outbound filter on routes sent downstream, classifying an Ethernet VPN prefix route by its reachability information length. Unwanted routes are suppressed at the topological fork nearest the originator, or never originated. A negotiated capability gates the encoding, and advertisements without a descriptor request every payload class, so upgraded and legacy routers interoperate without route loss.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Anonymous, "Payload-Aware Constrained Route Distribution for Ethernet VPN IP Prefix Routes", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/11834