Arista devices that function as a router support various dynamic routing protocols like BGP, OSPF. Customers can configure local or static routes as well. The routing subsystem is responsible for creating the forwarding information base (FIB) from routing information received by customer configuration or dynamic routing protocols. The FIB has the complete details about all the routes that are active in the system and will be used for data forwarding. In the context of this MIB, we specifically refer to the unicast FIB. This MIB provides useful statistics about the FIB. Arista devices support routing function for IPv4 and IPv6 address families. Arista devices also support the concept of virtual routing and forwarding (VRF), with a single device providing multiple routing instances. This allows customers to isolate network traffic and use overlapping addresses. A VRF instance is identified by a customer configured string. Arista devices maintain independent FIB for each address family and VRF instance. This MIB provides access to FIB summary of all address families within a specific VRF instance. Network Management Stations can obtain FIB summary for every VRF instance by specifying the VRF instance as a context, when using SNMPv3; or by including the VRF instance in the community string (format is <community>@<vrf instance>) when using SNMPv2.