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Create Logical Routers

A logical router replicates the functions of a physical router. It connects multiple virtual networks. A logical router performs a set of tasks that can be handled by a physical router, and contains multiple routing instances and routing tables.

Follow these steps to create a logical router (LR).

  1. Navigate to Overlay>Logical Routers and click Create.

    The Create Logical Routers page is displayed.

  2. Enter the following information as given in Table 1.
    Table 1: Create a Logical Router

    Field

    Action

    Name

    Enter a name for the Logical Router.

    Admin State

    Select the administrative state that you want the device to be in when the router is activated.

    Up is selected by default.

    Logical Router Type

    Select SNAT Routing or VXLAN Routing from the list.

    Choose Fabric

    Select the fabric that you are associating this logical router to.

    Connected Networks

    Select the networks that you want to connect this logical router to.

    Extend to Physical Router

    Select the physical router(s) to which you want to extend virtual networks or routed virtual networks to, from the Extend to Physical Router list.

    A physical router provides routing capability to the logical router.

    Reconfigure Physical Routers

    This link is enabled when you select a routed virtual network from the Connected networks list. Click Reconfigure Physical Router to reconfigure a physical router that you want to extend a virtual network to.

    For more information, refer to the Create Logical Routers section of the Using Static, eBGP, PIM, and OSPF Protocols to Connect to Third-Party Network Devices topic.

    Public Logical Router

    (Optional) Select this check box if you want the logical router to function as a public logical router.

    NAT

    Select this check box to enable Network Address Translation (NAT).

    This check box is disabled by default.

    VxLAN Network Identifier

    Enter VXLAN network identifier in the range from 1 through 16,777,215.

    This field is disabled by default.

    DHCP IP Address

    Enter DHCP relay server IP address.

    You can add more than one IP address. To add another address, clicl +Add.

    Route Target(s)

    Click +Add to add route targets.

    Enter Autonomous System (AS) number in the ASN field.

    • Enter ASN in the range of 1-4,294,967,295, when 4 Byte ASN is enabled in Global Config.

    • Enter ASN in the range of 1-65,535, when 4 Byte ASN is disabled.

    • You can also add suffix L or l (lower-case L) at the end of a value in the ASN field to assign an AS number in 4-byte range. Even if the value provided in the ASN field is in the range of 1-65,535, adding L or l (lower-case L) at the end of the value assigns the AS number in 4-byte range. If you assign the ASN field a value in the 4-byte range, you must enter a value in the range of 0-65,535 in the Target field.

    Enter route target in the Target field.

    • Enter route target in the range of 0-65,535, when 4 Byte ASN is enabled and ASN field is assigned a 4-byte value.

    • Enter route target in the range of 0-4,294,967,295, when the ASN field is assigned a 2-byte value.
  3. Click Create to create the logical router.

    The Logical Routers page is displayed.

Note:

The router_interface object (Virtual Port) is created as part of the LR creation and VN extension to Spines workflow. While planning the IP address for spines, you must be aware that an extra one IP address is required for the router_interface object which gets created automatically.