RPL stands for “Routing Protocol for Low-Power and Lossy Networks.” It is a routing protocol specifically designed for challenging, noise-prone environments such as the Internet of Things (IoT).
What is an LLN?
LLNs (Low-Power and Lossy Networks) are a class of networks characterized by the following:
- They consist of a large number of nodes with limited processing power, memory, and energy constraints.
- Nodes are connected by noisy links that typically cannot support high data rates and have low stability due to a low packet delivery rate.
- Traffic patterns in LLNs are rarely point-to-point; they are most often point-to-multipoint or multipoint-to-point.
- These networks can consist of thousands of nodes, which imposes significant requirements on routing protocols.
Key Terminology in RPL
To understand how RPL operates, it is essential to be familiar with the following terms:
- DAG: Directed Acyclic Graph.
- DODAG: Destination-Oriented DAG.
- DIO: DODAG Information Object.
- DAO: Destination Advertisement Object.
- DIS: DODAG Information Solicitation.
- CC: Consistency Check.
- RPL Instance: A set of one or more DODAGs that share a
RPLInstanceID. - RPLInstanceID: A unique identifier within a network.
- Objective Function (OF): An OF defines how routing metrics, optimization objectives, and related functions are used to compute the Rank.
- DODAGs with the same
RPLInstanceIDshare the same Objective Function.
- DODAGs with the same
Tags:
#RPL #IoT #LLN #Networking #RoutingProtocols #WirelessSensorNetworks #EmbeddedSystems #SmartGrid
