This document describes the on_nexthop_group_programmed event within the context of both the EOS SDK and the EOS SDK RPC agent. This event is triggered when there is an update to the state of a watched nexthop group.   These state updates include both the hardware programming of the group itself, as well as the hardware status of any counters associated with the group.

This document describes the prefix counter feature and is intended for customers who are familiar with and are using VRF selection policies (see linked TOI for details). In short, the prefix counter feature enables traffic matching a VRF selection policy to be counted on a per-prefix/per-route basis. This is limited to IPv4 traffic and prefixes of length 32.