1# SPDX-License-Identifier: GPL-2.0-only 2# 3# IEC 62439-3 High-availability Seamless Redundancy 4# 5 6config HSR 7 tristate "High-availability Seamless Redundancy (HSR & PRP)" 8 help 9 This enables IEC 62439 defined High-availability Seamless 10 Redundancy (HSR) and Parallel Redundancy Protocol (PRP). 11 12 If you say Y here, then your Linux box will be able to act as a 13 DANH ("Doubly attached node implementing HSR") or DANP ("Doubly 14 attached node implementing PRP"). For this to work, your Linux box 15 needs (at least) two physical Ethernet interfaces. 16 17 For DANH, it must be connected as a node in a ring network together 18 with other HSR capable nodes. All Ethernet frames sent over the HSR 19 device will be sent in both directions on the ring (over both slave 20 ports), giving a redundant, instant fail-over network. Each HSR node 21 in the ring acts like a bridge for HSR frames, but filters frames 22 that have been forwarded earlier. 23 24 For DANP, it must be connected as a node connecting to two 25 separate networks over the two slave interfaces. Like HSR, Ethernet 26 frames sent over the PRP device will be sent to both networks giving 27 a redundant, instant fail-over network. Unlike HSR, PRP networks 28 can have Singly Attached Nodes (SAN) such as PC, printer, bridges 29 etc and will be able to communicate with DANP nodes. 30 31 This code is a "best effort" to comply with the HSR standard as 32 described in IEC 62439-3:2010 (HSRv0) and IEC 62439-3:2012 (HSRv1), 33 and PRP standard described in IEC 62439-4:2012 (PRP), but no 34 compliancy tests have been made. Use iproute2 to select the protocol 35 you would like to use. 36 37 You need to perform any and all necessary tests yourself before 38 relying on this code in a safety critical system! 39 40 If unsure, say N. 41