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 @)
when using SNMPv2.