> +IEC 62439-3 (HSR/PRP)
> +---------------------
> +
> +The Parallel Redundancy Protocol (PRP) is a network redundancy protocol which
> +works by duplicating and sequence numbering packets through two independent
> L2
> +networks (which are unaware of the PRP tail tags carried in the packets), and
> +eliminating the duplicates at the receiver. The High-availability Seamless
> +Redundancy (HSR) protocol is similar in concept, except all nodes that carry
> +the redundant traffic are aware of the fact that it is HSR-tagged (because
> HSR
> +uses a header with an EtherType of 0x892f) and are physically connected in a
> +ring topology. Both HSR and PRP use supervision frames for monitoring the
I don't know HSR/PRP terms. Should it be supervisory instead of
supervision?
> +health of the network and for discovering the other nodes.
Either "discovering other nodes" or "discovery of other nodes".
> +
> +In Linux, both HSR and PRP are implemented in the hsr driver, which
> +instantiates a virtual, stackable network interface with two member ports.
> +The driver only implements the basic roles of DANH (Doubly Attached Node
> +implementing HSR) and DANP (Doubly Attached Node implementing PRP); the roles
> +of RedBox and QuadBox aren't (therefore, bridging a hsr network interface
> with
In colloquial English, you can get away with just 'aren't'. But in
Queens English, you should follow it with something, in this case
'supported'.
Andrew
