tree a52a4dd0750467845f237ee5e4e88aa95ea11bab
parent 4a7e58bf481adb843707eec4a81213776a6d5212
author Neale Ranns <nranns@cisco.com> 1475496348 +0100
committer Damjan Marion <dmarion.lists@gmail.com> 1475875944 +0000

unicast RPF for FIB2.0

In a heirarchical FIB performing a unicast RPF check would require the traversal of the data-plane graph to seek out all the adjacency objects and then read those to find their interface. This is not efficient. Instead, for each path-list we construct a list of unique input interfaces and link this uRPF-list against the entry in the prefix table. In the data-plane the uRPF list can be retrieved from the load-balance lookup result and the RPF check is a simple and efficient walk across the minimal interface list. The uRPF-list is maintained as the routing heirarchy changes, in a similar way to the data-plane object graph.
We also provide a knob to allow an arbitrary prefix to pass the loose check.

Change-Id: Ie7c0ae3c4483ef467cfd5b136ee0315ff98ec15b
Signed-off-by: Neale Ranns <nranns@cisco.com>