SimpleFabric application is built to replace legacy leaf networks where lP subnets are collocated with each leaf L2 switches and do simple IP routing to upper gateway to Internet

Features

L2 Forwarding

• L2 Unicast Forwarding: Intra-Subnet is handled by Destination MAC matching Intents; based on HostService information
• L2 Broadcast Forwarding: Intra-Subnet broadcast is handles by Destination MAC matching Intents; base on L2Network configuration

L3 Forwarding

• L3 Unicast Inter-Subnet Forwarding: Inter-Subnet IP Traffic forwarding by Destination IP matching Intents; Reactive Routing
• L3 Unicast Upper Route Forwarding: Subnet to Outer Gateway IP Traffic forwarding by Destination IP matching Intents; Reactive Routing

Neighbour Handling

• ARP Forwarding: ARP messages are forwarded by IP-Subnet and L2Network configuration
• ARP and ICMP Echo Handling on Virtual Gateway IP: ARP and Ping requests on Virtual Gateway IP are handled

Fault Tolerance

• All forwarding are activated by Intents Framework which auto reconfigures on link failures

Configurations

L2Networks

• name: name of L2Network to be used by IpSubnets
• interfaces: interfaces names of ports of this L2Network
• l2Forward: yes to enable L2 Destination MAC based forwarding

IpSubnets

• ipPrefix: IP subnet range
• gatewayIp: Virtual Gateway IP address
• gatewayMac: Virtual Gateway Mac address
• l2NetworkName: L2Network this IpSubnet is collocated

BorderRoutes

• ipPrefix: route prefix
• nextHop: outer gateway IP

Example network-cfg.json file:

{

  "devices":{

    ... list of devices ...

    "of:0000000000000011":{ "basic":{ "name":"LS1", "latitude":35, "longitude":-100 } },

    "of:0000000000000012":{ "basic":{ "name":"LS2", "latitude":35, "longitude":-90  } },

    "of:0000000000000021":{ "basic":{ "name":"SS1", "latitude":40, "longitude":-100 } },

    "of:0000000000000022":{ "basic":{ "name":"SS2", "latitude":40, "longitude":-90  } }

  },

  "ports" : {

    ... list of port/interfaces ...

    "of:0000000000000011/1" : { "interfaces" : [ { "name" : "h11" } ] },

    "of:0000000000000011/2" : { "interfaces" : [ { "name" : "h12" } ] },

    "of:0000000000000011/3" : { "interfaces" : [ { "name" : "h13" } ] },

    "of:0000000000000011/4" : { "interfaces" : [ { "name" : "h14" } ] },

    "of:0000000000000011/5" : { "interfaces" : [ { "name" : "d11" } ] },

    "of:0000000000000011/6" : { "interfaces" : [ { "name" : "d12" } ] },

    "of:0000000000000011/7" : { "interfaces" : [ { "name" : "LS1_SS1" } ] },

    "of:0000000000000011/8" : { "interfaces" : [ { "name" : "LS1_SS2" } ] },

    "of:0000000000000012/1" : { "interfaces" : [ { "name" : "h21" } ] } ,

    "of:0000000000000012/2" : { "interfaces" : [ { "name" : "h22" } ] },

    "of:0000000000000012/3" : { "interfaces" : [ { "name" : "h23" } ] },

    "of:0000000000000012/4" : { "interfaces" : [ { "name" : "h24" } ] },

    "of:0000000000000012/5" : { "interfaces" : [ { "name" : "d21" } ] },

    "of:0000000000000012/6" : { "interfaces" : [ { "name" : "d22" } ] },

    "of:0000000000000012/7" : { "interfaces" : [ { "name" : "LS2_SS1" } ] },

    "of:0000000000000012/8" : { "interfaces" : [ { "name" : "LS2_SS2" } ] },

    "of:0000000000000021/1" : { "interfaces" : [ { "name" : "SS1_LS1" } ] },

    "of:0000000000000021/2" : { "interfaces" : [ { "name" : "SS1_LS2" } ] },

    "of:0000000000000022/1" : { "interfaces" : [ { "name" : "SS2_LS1" } ] },

    "of:0000000000000022/2" : { "interfaces" : [ { "name" : "SS2_LS2" } ] }

  },

  "apps" : {

    "org.onosproject.simplefabric" : {

      "simpleFabric" : {

        "l2Networks" : [

          { "name" : "LEAF1", "interfaces" : ["h11", "h12", "h13", "h14", "d11", "d12" ], "l2Forward" : true },

          { "name" : "LEAF2", "interfaces" : ["h21", "h22", "h23", "h24", "d21", "d22" ], "l2Forward" : true }

        ],

        "ipSubnets" : [

           { "ipPrefix" : "10.0.1.0/24", "gatewayIp" : "10.0.1.1", "gatewayMac" : "00:00:10:00:01:01", "l2NetworkName" : "LEAF1" },

           { "ipPrefix" : "10.0.2.0/24", "gatewayIp" : "10.0.2.1", "gatewayMac" : "00:00:10:00:02:01", "l2NetworkName" : "LEAF2" }

        ],

        "borderRoutes" : [

           { "ipPrefix" : "0.0.0.0/0", "nextHop" : "10.0.1.2" }

        ]

      }

    }

  }

}

Modules

Topology configurations and events are all maintained by SimpleFabricManager and notified to sub modules to apply updates status.

Reactive Routing is handled by SimpleFabricReactiveRouting module and ARPs are forwarded by SimpleFabricNeighbour module.