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Configuring EVPN with IRB Solution

 

You can configure an Ethernet VPN (EVPN) with IRB solution to enable Layer 2 switching and Layer 3 routing operations within a single node, thus avoiding extra hops for inter-subnet traffic. The EVPN IRB solution eliminates the default gateway problem using the gateway MAC and IP synchronization, and avoids the triangular routing problem with Layer 3 interworking by creating IP host routes for virtual machines (VMs) in the tenant virtual routing and forwarding (VRF) routing instances.

Before you begin:

  1. Configure the router interfaces.

  2. Configure the router ID and autonomous system number for the device.

  3. Enable chained composite next hop for EVPN.

  4. Configure OSPF or any other IGP protocol.

  5. Configure a BGP internal group.

  6. Include the EVPN signaling network layer reachability information (NLRI) to the internal BGP group.

  7. Configure RSVP or LDP.

  8. Configure MPLS.

  9. Create a label-switched path between the provider edge (PE) devices.

To configure the PE device:

  1. Configure the EVPN routing instance.
  2. Set the VLAN identifier for the bridging domain in the EVPN routing instance.
  3. Configure the interface name for the EVPN routing instance.
  4. Configure the IRB interface as the routing interface for the EVPN routing instance.
  5. Configure the route distinguisher for the EVPN routing instance.
  6. Configure the VPN routing and forwarding (VRF) target community for the EVPN routing instance.
  7. Assign the interface name that connects the PE device site to the VPN.
  8. Configure the VRF routing instance.
  9. Configure the IRB interface as the routing interface for the VRF routing instance.
  10. Configure the route distinguisher for the VRF routing instance.
  11. Configure the VRF label for the VRF routing instance.
  12. Verify and commit the configuration.

    For example: