Anycast-based internet protocol redirection to alleviate partial routing tables

摘要

Systems and methods are described that instruct routers having constrained hardware/memory to redirect all outbound traffic to a helper router. The helper router contains a full routing table that can forward any packet to its destination. In a large service provider network, helper routers may be distributed at multiple locations across the network. Since packets must detour through the helper router, the distributed helper routers minimize latency.

主权项

1. A method for configuring a data communications network, the data communications network including a plurality of interconnected routers with one or more helper routers and one or more non-helper routers, each helper router having a full routing table, the method comprising:
by a non-helper router, receiving an announcement of a default route of a helper router via anycast-prefix addressing over a routing protocol; by the non-helper router, receiving instructions to delete a full routing table of the non-helper router, the instructions being based on a determination that the non-helper router is a constrained router; and by the non-helper router, in response to the instructions to delete the full routing, deleting the full routing table of the non-helper router.