Table Of Contents
Table Of Contents

Frame Replication with Time-Aware Shaping

Goals

In this example we demonstrate how to automatically configure time-aware shaping in the presence of frame replication.

INET version: 4.4

The Model

The network contains a source and a destination node and five switches.

Here is the network:

../../../../../_images/Network11.png

Here is the configuration:

[General]
description = "Combining frame replication with time-aware shaping"
network = FrerAndTasShowcase

# disable automatic MAC forwarding table configuration
*.macForwardingTableConfigurator.typename = ""

# disable all non frame replication related TSN features in all network nodes
*.*.hasTimeSynchronization = false
*.*.hasIngressTrafficFiltering = false
*.*.hasEgressTrafficShaping = false
*.*.hasOutgoingStreams = false

# all Ethernet interfaces have 100 Mbps speed
*.*.eth[*].bitrate = 100Mbps

# packet error rate of all links is 20%
**.channel.per = 0.2

# enable frame replication and elimination
*.*.hasStreamRedundancy = true

# source application
*.source.numApps = 1
*.source.app[0].typename = "UdpSourceApp"
*.source.app[0].io.destAddress = "destination"
*.source.app[0].io.destPort = 1000
*.source.app[0].source.displayStringTextFormat = "sent %p pk (%l)"

# deterministic application traffic configuration
*.source.app[0].source.packetLength = 100B
*.source.app[0].source.productionInterval = 5ms

# destination application
*.destination.numApps = 1
*.destination.app[0].typename = "UdpSinkApp"
*.destination.app[0].io.localPort = 1000

# all interfaces must have the same address to accept packets from all streams
*.destination.eth[*].address = "0A-AA-12-34-56-78"

# visualizer
*.visualizer.infoVisualizer.modules = "*.source.app[0].source or *.destination.app[0].sink"

# enable all automatic configurators
*.gateScheduleConfigurator.typename = "EagerGateScheduleConfigurator"
*.streamRedundancyConfigurator.typename = "StreamRedundancyConfigurator"
*.failureProtectionConfigurator.typename = "FailureProtectionConfigurator"

# gate scheduling visualizer
*.visualizer.gateScheduleVisualizer.displayGateSchedules = true
*.visualizer.gateScheduleVisualizer.displayDuration = 100us
*.visualizer.gateScheduleVisualizer.gateFilter = "*.source.eth[0].** or *.s1.eth[0..1].** or *.s2*.eth[0..1].** or *.s3*.eth[0].** "
*.visualizer.gateScheduleVisualizer.height = 16

# gating configuration
*.*.eth[*].macLayer.queue.typename = "GatingPriorityQueue"
*.*.eth[*].macLayer.queue.numQueues = 1
*.*.eth[*].macLayer.queue.classifier.typename = "ContentBasedClassifier"
*.*.eth[*].macLayer.queue.classifier.packetFilters = ["*"]
*.*.eth[*].macLayer.queue.queue[*].typename = "DropTailQueue"
*.*.eth[*].macLayer.queue.gate[*].bitrate = 100Mbps

# enable stream policing in layer 2
*.*.bridging.streamRelay.typename = "StreamRelayLayer"
*.*.bridging.streamCoder.typename = "StreamCoderLayer"

# gate scheduling configuration
*.gateScheduleConfigurator.gateCycleDuration = 20ms

# TSN configuration
# 64B = 8B (UDP) + 20B (IP) + 4B (802.1R) + 6B (802.1Q) + 14B + 4B (ETH MAC) + 8B (ETH PHY)
*.failureProtectionConfigurator.configuration = [{name: "S1", application: "app[0]", source: "source", destination: "destination",
                                                  pcp: 0, gateIndex: 0, packetFilter: "*",
                                                  packetLength: 100B + 64B, packetInterval: 5ms, maxLatency: 100us,
                                                  nodeFailureProtection: [{any: 1, of: "s2a or s2b or s3a or s3b"}],
                                                  # this link failure protection is somewhat redundant for demonstration purposes
                                                  linkFailureProtection: [{any: 1, of: "*->* and not source->s1"},
                                                                          {any: 2, of: "s1->s2a or s2a->s2b or s2b->s3b"},
                                                                          {any: 2, of: "s1->s2b or s2b->s2a or s2a->s3a"}]}]

# visualizer
*.visualizer.failureProtectionConfigurationVisualizer.displayTrees = true
*.visualizer.failureProtectionConfigurationVisualizer.lineStyle = "dashed"
*.visualizer.streamRedundancyConfigurationVisualizer.displayTrees = true
*.visualizer.streamRedundancyConfigurationVisualizer.lineColor = "black"

Results

Here is the number of packets received and sent:

../../../../../_images/packetsreceivedsent.svg

Here is the ratio of received and sent packets:

../../../../../_images/packetratio.png

Sources: omnetpp.ini, FrerAndTasShowcase.ned

Discussion

Use this page in the GitHub issue tracker for commenting on this showcase.