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Example: Configuring Cross-Connect on NFX350 Devices

This example shows how to configure the cross-connect feature on NFX350 devices.

Requirements

This example uses an NFX350 device running Junos OS Release 19.4R1.

Overview

The cross-connect feature enables traffic switching between any two VNF interfaces. You can bidirectionally switch either all traffic or traffic belonging to a particular VLAN between any two VNF interfaces.

Note:

This feature does not support unidirectional traffic flow.

The cross-connect feature supports the following:

  • Port cross-connect between two VNF interfaces for all network traffic.

  • VLAN-based traffic forwarding between VNF interfaces that support the following functions:

    • Provides an option to switch traffic based on a VLAN ID.

    • Supports VLAN PUSH, POP, and SWAP operations.

    • Supports network traffic flow from trunk to access port through the POP operation.

    • Supports network traffic flow from access to trunk ports through the PUSH operation.

Topology

This example uses the topology shown in Figure 1.

Figure 1: Configuring Cross-ConnectConfiguring Cross-Connect

Configuration

Configure VLANs

Step-by-Step Procedure

  1. Configure VLANs for the LAN-side interfaces.

  2. Configure a VLAN for the WAN-side interface.

Configure the Layer 2 Datapath

Step-by-Step Procedure

  1. Configure the LAN-side front panel ports and add them to the LAN-side VLAN.

  2. Configure the internal-facing interfaces as trunk ports and add them to the WAN-side VLAN. The internal-facing interfaces are typically trunk ports as they must support traffic from multiple front panel ports and VLANs.

Configure the Layer 3 Datapath

Step-by-Step Procedure

  1. Configure VLAN tagging on ge-1/0/0:

  2. Configure VLAN tagging on ge-1/0/2:

Configure the VNF

Step-by-Step Procedure

  1. Launch the VNF:

  2. Specify the number of CPUs required for the VNF:

  3. Pin a virtual CPU to a physical CPU:

  4. Create host VLANs:

  5. Configure the VNF interfaces as trunk ports and add them to the LAN-side VLAN:

  6. Specify the memory allocation for the VNF:

Configure Cross-Connect

Step-by-Step Procedure

  1. Configure cross-connect:

Verify the Configuration

Verifying the Control Plane Configuration

Purpose

Verify the control plane configuration:

Action

  • Verify the VLANs configured.

  • Verify that the VLANs and VLAN memberships are correct by using the show vmhost vlans command.

  • Verify that the VNF is operational. The State field shows Running for VNFs that are up.

    The Liveliness field of the VNF indicates whether the internal management IP address of the VNF is accessible from the Junos Control Plane (JCP).

    To view more details of the VNF:

Verifying the Data Plane Configuration

Purpose

Verify the data plane configuration.

Action

  • Verify the status of the Layer 2 (ge-0/0/x) and Layer 3 (ge-1/0/x) interfaces.

    For example:

  • Verify the status of the OVS interfaces.