optimize ethernet communication using prp and hsr redundancy protocols
TRANSCRIPT
Schneider Electric 2- Energy – HSR & PRP – Henri Grasset 22/08/2014
HSR or PRP or a mix of?
Single ring HSR is preferred to connect a small amount of IEDs*● HSR is using single ring topology thus no need of additional switches● Plug & Play● It is not possible to connect a laptop to this network but using a Red Box● The communication bandwidth used is “multiplied” thus the number of IEDs is limited*
● Double (or multiple) rings can not help as the bottleneck(s) would be in the rings interconnection (red/quad box)
*: Around 20 for 100Mbit/s
Optional RedBox
Ring A Ring B
Schneider Electric 3- Energy – HSR & PRP – Henri Grasset 22/08/2014
HSR or PRP or a mix of?
PRP is preferred to connect a big amount of IEDs sharing the same application and with no need of either physical network or sub application segregation*
● It is possible to directly connect a laptop to this network● Plug & Play● The communication bandwidth used is “normal” thus the number of IEDs is “not limited”● PRP is usually using star topology thus additional switches are needed
*: during test for example
PRP
Network 1 Network 2
PRP PRP
PRP SwitchPRP Switch
Schneider Electric 4- Energy – HSR & PRP – Henri Grasset 22/08/2014
HSR or PRP or a mix of?
Mix of single rings HSR and PRP is preferred to connect a big amount of IEDs not sharing the same applications or with a need of either network or sub application segregation
● Plug & Play● It is possible to directly connect a laptop to the PRP network and communicate with all the
IEDs
1. HSR Rings● HSR is using ring topology thus no need of additional switches● The amount of IED is small* thus no bandwidth issue
2. PRP network● The amount of IEDs is “not limited”● The amount of switches is optimized
3. HSR/PRP interconnections● Made with 2 Red Boxes per connection
*: Around 20 for 100Mbit/s
Schneider Electric 5- Energy – HSR & PRP – Henri Grasset 22/08/2014
Optimised Network Topology
RedBox RedBox
Network 1
Ring A
HSR HSR
Ring B
Control
Switch
Schneider Electric 6- Energy – HSR & PRP – Henri Grasset 22/08/2014
Optimised Network Topology
RedBox 1 RedBox 2 RedBox 3 RedBox 4PRP
Network 1
Ring A
Network 2
HSR HSR
Ring B
PRP Switch
PRP Switch
Schneider Electric 7- Energy – HSR & PRP – Henri Grasset 22/08/2014
HSR or PRP or a mix of?
Conclusion:
● There is no “fit for all” or “Best” solution
● For small amount of IEDs*:● Single ring HSR is preferred
● For big amount of IEDs:● If there is no need of either physical network or sub application segregation
– PRP is preferred
● If there is a need of either physical network or sub application segregation– Mix of single rings HSR and PRP is preferred
*: Around 20 for 100Mbit/s
Schneider Electric 8- Energy – HSR & PRP – Henri Grasset 22/08/2014
Future Optimised Network Topology?
“SmartQuadBox 1
SQuadBox 2
“Smart” QuadBox 3
“Smart“ QuadBox 4
1Gbit HSRWith Multicastfiltering
Ring A
100 Mbit HSR 100 Mbit HSR
Ring B
Schneider Electric 12- Energy – HSR & PRP – Henri Grasset 22/08/2014
PRP (IEC 62439-3 Clause 4)● Differences (with HSR)
● Allows● Mixing single and double network attachment devices on the same LAN (not
redundant and redundant devices)● Thus connect laptops and workstations to the network with standard Ethernet
adapters (not redundant devices)
● Uses off-the shelf components (network interfaces, controllers, switches…)
● HSR:● Ethernet redundancy method DEPENDENT of the HSR Ethernet protocol● DOES NOT Allow Mixing single and double network attachment devices on the
same LAN (not redundant and redundant devices)● Thus connect laptops and workstations to the network with standard Ethernet
adapters must be done by RedBox
● Uses HSR components (network interfaces, controllers, switches…)
Schneider Electric 13- Energy – HSR & PRP – Henri Grasset 22/08/2014
PRP Network Architecture
switch
DANP
switch
Local Area Network B
DANP
switchswitch
switch
SAN
switch
DANP DANP
Local Area Network A
DANPDANP
Two Ethernet networks (LANs) , completely separated, operate in parallel. Each doubly attached node with PRP (=DANP) has an interface to each LAN.A DANP source sends a frame simultaneously on both LANs.attentionA DANP destination receives in normal operation both frames and discards the duplicate.A singly attached destination only receives one.If a LAN fails, a DANP destination operates with the frames from the other LAN.
= Doubly Attached Node(PRP)
DANP SAN
PRP “A” framesPRP “B” framesstandard frames
= SinglyAttachedNode
SAN
SAN
source
destinations destinations
Schneider Electric 14- Energy – HSR & PRP – Henri Grasset 22/08/2014
PRP Network Architecture
switch
DANP
switch
Local Area Network B
DANP
switchswitch
switch
SAN
switch
DANP DANP
Local Area Network A
DANPDANP
Two Ethernet networks (LANs) , completely separated, operate in parallel. Each doubly attached node with PRP (=DANP) has an interface to each LAN.A DANP source sends a frame simultaneously on both LANs.attentionA DANP destination receives in normal operation both frames and discards the duplicate.A singly attached destination only receives one.If a LAN fails, a DANP destination operates with the frames from the other LAN.
= Doubly Attached Node(PRP)
DANP SAN
PRP “A” framesPRP “B” framesstandard frames
= SinglyAttachedNode
SAN
SAN
source
destinations destinations
Schneider Electric 15- Energy – HSR & PRP – Henri Grasset 22/08/2014
PRP Network Architecture
switch
DANP
switch
Local Area Network B
DANP
switchswitch
switch
SAN
switch
DANP DANP
Local Area Network A
DANPDANP
Two Ethernet networks (LANs) , completely separated, operate in parallel. Each doubly attached node with PRP (=DANP) has an interface to each LAN.A DANP source sends a frame simultaneously on both LANs.attentionA DANP destination receives in normal operation both frames and discards the duplicate.A singly attached destination only receives one.If a LAN fails, a DANP destination operates with the frames from the other LAN.
= Doubly Attached Node(PRP)
DANP SAN
PRP “A” framesPRP “B” framesstandard frames
= SinglyAttachedNode
SAN
SAN
source
destinations destinations
= RedBox(SAN / PRP)
Schneider Electric 16- Energy – HSR & PRP – Henri Grasset 22/08/2014
Px40 Network Topology example
LAN B of any typeLAN A of any type
Px4x Px4x Px4x
Schneider Electric 17- Energy – HSR & PRP – Henri Grasset 22/08/2014
Frame identification
●PRP● PRP “tag” is at the end of the frame in order to be interoperable with today’s (not PRP) switches
●HSR● HSR “tag” is at the beginning of the frame in order to transmit further without delay
Schneider Electric 19- Energy – HSR & PRP – Henri Grasset 22/08/2014
HSR (IEC 62439-3 Clause 4)● Differences with PRP
● DOES NOT Allow Mixing single and double network attachment devices on the same LAN (not redundant and redundant devices)
● Thus connect laptops and workstations to the network with standard Ethernet adapters must be done by RedBox
● Uses HSR components (network interfaces, controllers, switches…)
● PRP:● Ethernet redundancy method independent of any Ethernet protocol● Allows
● Mixing single and double network attachment devices on the same LAN (not redundant and redundant devices)
● Thus connect laptops and workstations to the network with standard Ethernet adapters (not redundant devices)
● Uses off-the shelf components (network interfaces, controllers, switches…)
Schneider Electric 20- Energy – HSR & PRP – Henri Grasset 22/08/2014
HSR Network Architecture
“An” Ethernet network Ring(s) connecting each doubly attached node with HSR (=DANH).A DANH source sends a frame simultaneously on both ports and blocks the sent messages.All DANH receive in normal operation both frames and instantaneously forwards them.A DANH destination receives in normal operation both frames, forwards them and discards the duplicate.A singly attached destination only receives one via a RedBox.If a link fails, a DANH destination operates with the frames from the other path.
PRP “A” framesPRP “B” framesstandard frames
Schneider Electric 21- Energy – HSR & PRP – Henri Grasset 22/08/2014
HSR Network Architecture
“An” Ethernet network Ring(s) connecting each doubly attached node with HSR (=DANH).A DANH source sends a frame simultaneously on both ports and blocks the sent messages.All DANH receive in normal operation both frames and instantaneously forwards them.A DANH destination receives in normal operation both frames, forwards them and discards the duplicate.A singly attached destination only receives one via a RedBox.If a link fails, a DANH destination operates with the frames from the other path.
PRP “A” framesPRP “B” framesstandard frames
Schneider Electric 22- Energy – HSR & PRP – Henri Grasset 22/08/2014
Px40 Network Topology example
Px4x Px4x Px4x