Explore the role of Bidirectional Forwarding Detection (BFD) in dynamic routing protocols. Learn how OSPF, BGP, and RIP leverage BFD for fast failover in high availability networks.
Table of Contents
Question
An engineer manages a high availability network and requires fast failover of the routing protocols. The engineer decides to implement BFD.
Which three dynamic routing protocols support BFD? (Choose three.)
A. OSPF
B. IGRP
C. OSPFv3 virtual link
D. BGP
E. RIP
Answer
A. OSPF
D. BGP
E. RIP
Explanation
Bidirectional Forwarding Detection (BFD) is a network protocol used to detect faults between two forwarding engines connected by a link. It provides low-overhead detection of faults even on physical media that doesn’t support failure detection of any kind, such as Ethernet, virtual circuits, tunnels and MPLS Label Switched Paths.
The three dynamic routing protocols that support BFD are:
- OSPF (Open Shortest Path First): OSPF is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing algorithm and falls into the group of interior gateway protocols, operating within a single autonomous system (AS).
- BGP (Border Gateway Protocol): BGP is a routing protocol used to exchange routing information across autonomous systems in the Internet. It is classified as a path-vector protocol.
- RIP (Routing Information Protocol): RIP is one of the oldest distance-vector routing protocols which employ the hop count as a routing metric. RIP prevents routing loops by implementing a limit on the number of hops allowed in a path from source to destination.
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