For single-hop BFD (Bidirectional Forwarding Detection), the configuration must include the local and remote discriminators to uniquely identify the session endpoints. Additionally, enabling BFD globally is a prerequisite for initiating BFD sessions. Configuring multicast IP addresses isunnecessary for single-hop BFD, as it operates over direct links. Huawei's configuration guidelines specify these requirements to ensure effective deployment and operation of BFD.
Understanding BFD (Bidirectional Forwarding Detection):
BFD is a protocol used to detect link faults quickly between two routers.
Single-hop BFD operates on directly connected links and is commonly used for fast fault detection in routing protocols like OSPF and BGP.
HCIP-Datacom-Core Technology Training Material (BFD Basics and Configuration).
Mandatory Configurations for Single-Hop BFD:
A. Configure the remote discriminator of a BFD session:The remote discriminator is used to uniquely identify the BFD session at the remote end. This is essential for session establishment.
B. Configure the local discriminator of a BFD session:The local discriminator uniquely identifies the BFD session at the local end. This is required to establish a BFD session.
D. Enable BFD globally:BFD must be enabled globally on the router for the protocol to operate and for session configurations to take effect.
Optional Configuration:
C. Configure a multicast IP address for BFD:This is not required for single-hop BFD, as it operates over direct links using unicast communication. Multicast is used in other scenarios, like multi-hop BFD.
Conclusion:The correct configurations for single-hop BFD areA,B, andD.
