1. DetNet Data Plane Protection Implementation Report
DetNet Data Plane Protection Implementation Report
János Farkas, Balázs Varga, István Moldován
IETF 99

2. Reliability on the Spot
DetNet Data Plane Protection
Reliability on the Spot
Deterministic Packet Transport
Synchronization
Resource Mgmt
Reliability
Latency
Bounded low latency
Time sync
Zero congestion loss
Dedicated resources & API
Packet / Frame Replication and Elimination
Guaranteed data transport with bounded low latency, low delay variation, and extremely low loss
Time sync
Ultra Reliability
Synchronization
Reliability
Latency
Resource Mgmt
Bounded low latency
Dedicated resources & API
Zero congestion loss
Guaranteed data transport with bounded low latency, low delay variation, and extremely low loss

3. Reliability at Packet Level
DetNet Data Plane Protection
Reliability at Packet Level
FRER: Frame Replication and Elimination for Reliability
802.1CB: mechanism, pseudo code, L2 data plane
PREF: Packet Replication and Elimination Function
draft-dt-detnet-dp-sol-01: L3 data plane, i.e., IPv6 and PW over MPLS
Per-packet 1+1 (or 1+n) redundancy
Send packets on two (or more) disjoint paths, then combine and delete extras 16 15 14 N1 N2
disjoint paths
packet flow 16 15 14
Replication
Elimination

4. DetNet Data Plane Protection
Demo Setup
Remote control of a balancing robot
Control loop through a packet network
PREF / FRER implemented in Ericsson Research software switch on PCs
Reference: 50ms protection switching
CN1
EN1
EN2
CN2
Balancer Robot
Controller
packet network

5. PW MPLS Data Plane for TSN Service
DetNet Data Plane Protection
PW MPLS Data Plane for TSN Service
MPLS T-Label
PW Label
DetNet CW
D-MAC
S-MAC
EtherType
VID
Payload
DetNet Payload
D-MAC
S-MAC
EtherType
VID
Payload
Figure 2 in draft-dt-detnet-dp-sol-01
CN1
CN2
EN1
EN2
Balancer Robot
Controller

6. PW MPLS Data Plane Example
DetNet Data Plane Protection
PW MPLS Data Plane Example
Wireshark:
CN1
CN2
EN1
EN2
Balancer Robot
Controller

7. Demo Scenario 1: Link Failure
DetNet Data Plane Protection
Demo Scenario 1: Link Failure
Protection switching
Triggered by the failure
50ms outage on working path (the protection path is 2ms longer)
Impacts the application
PREF / FRER eliminate packet loss caused by outage
50ms
time
Failure location
CN1
EN1
EN2
CN2
Balancer Robot
Controller

8. DetNet Data Plane Protection
packet network
CN1
CN2
DetNet Data Plane Protection

9. DetNet Data Plane Protection
EN2
EN1
packet network
CN1
CN2
DetNet Data Plane Protection

10. Demo Scenario 2: Link Flapping
DetNet Data Plane Protection
Demo Scenario 2: Link Flapping
Link Flapping
Typical L1 problem caused by faulty cable or HW
Protection switching does not react
Multiple 20ms loss periods impact the application
PREF / FRER eliminate packet loss caused by outages
20ms
time
CN1
CN2
EN1
EN2
Balancer Robot
Controller
Failure location

11. DetNet Data Plane Protection
packet network
CN1
CN2
DetNet Data Plane Protection

12. DetNet Data Plane Protection
EN2
EN1
packet network
CN1
CN2

13. DetNet Data Plane Protection
Summary
PREF provides extremely low packet loss
Hitless failover because there is no switchover
Protection against failure events that are not even noticed in some environments
Implemented the Packet Replication and Elimination Function on PW over MPLS data plane as described in draft-dt-detnet-dp-sol-01
It works fine
No caveats found
Demo: today during the coffee break starting 15:30 in Tyrolka, Mezzanine Level

14. DetNet Data Plane Protection
DetNet Data Plane Protection