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In Trellis, we run every switch as router, each router needs a mac address and multiple interface configurations.

Interface config:

"Device-id/port-number" : {
    "interfaces" : [
        {
            "name": "interface name",
            "ips" : [ "10.0.1.254/24" ],
            "vlan-untagged": 10
        }
    ]
}

• Name: Interface name, can be empty or unset;

• ips: List of IP addresses for this interface, it can be the default gateway of the host;

• VLAN config, it can be: vlan-untagged only, vlan-tagged only or vlan-tagged + vlan-native.

• vlan-untagged (integer): this interface consumes untagged packet only and it belongs to a specific vlan;

• vlan-tagged (integer array): this interface can consumes specific tagged vlans;

• vlan-native (integer): if an untagged consumes by this port, and this is an interface with vlan-tagged setup, device will use this vlan for internal use;

Example of Segment Routing device settingsSegment routing device setting:

"Device-id" : {
    "segmentrouting" : {
        "name" : "Device name",
        "ipv4NodeSid" : 123,
        "ipv4Loopback" : "192.168.0.123",
        "ipv6NodeSid" : 223,
        "ipv6Loopback" : "2000::c0a8:0223",
        "routerMac" : "00:00:00:00:01:23",
        "isEdgeRouter" : true,
        "adjacencySids" : []
     }
}

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• Name:

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• Name

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• for segment routing device;

• ipv4(6)NodeSid:

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• Global unique id for IP loopback,

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• it is used

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• as MPLS

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• label in forwarding;

• ipv4(6)Loopback: Router loopback IP address, it should not be part of same same subnet defined on

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• dataplane interface;

• routerMac: Globally unique

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• Mac address. It will be used to reply ARP

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• requests for router IP or interface IP;

• isEdgeRouter: true if this device is edge/leaf, otherwise false;

• adjacencySids: Reserved, put empty array for now

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Interface config:

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In interface config:

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ips: IP address for this interface, can be the default gateway of the host

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VLAN config:

• vlan-untagged (integer): this interface consumes untagged packet only, and this interface belongs to specific vlan

• vlan-tagged (integer array): this interface can consumes specific tagged vlans

• vlan-native (integer): if an untagged consumes by this port, and this is an interface with vlan-tagged setup, device will use this vlan for internal use

• vlan config can be: vlan-untagged only, vlan-tagged only or vlan-tagged + vlan-native

Topology:

Host view:

In demo mininet topology, we set IP from interface as default gateway of hoststhe gateway of the hosts to the IP of the interface of the leaf switch.

Steps:

In this tutorial, we need to create 3 terminal window for:

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