Which instance type is used when configuring filter-based forwarding?

A.
vrf

B.
forwarding

C.
virtual-router

D.
fbf

Explanation:
You can create a filter to classify packets to determine their forwarding path within a router. Use filter-based forwarding to redirect traffic for analysis.

Filter-based forwarding is supported for Internet Protocol version 4 (IPv4) and Internet Protocol version 6 (IPv6).

Use filter-based forwarding for service provider selection when customers have Internet connectivity provided by different ISPs yet share a common access layer. When a shared media (such as a cable modem) is used, a mechanism on the common access layer looks at Layer2 or Layer3 addresses and distinguishes between customers. You can use filter-based forwarding when the common access layer is implemented using a combination of Layer2 switches and a single router.

With filter-based forwarding, all packets received on an interface are considered. Each packet passes through a filter that has match conditions. If the match conditions are met for a filter and you have created a routing instance, filter-based forwarding is applied to a packet. The packet is forwarded based on the next hop specified in the routing instance. For static routes, the next hop can be a specific LSP. For more information about configuring LSPs.

Note: Source-class usage filter matching and unicast reverse-path forwarding checks are not supported on an interface configured with filter-based forwarding (FBF).