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Configuring EVPN with Support for Virtual Switch

 

You can configure an Ethernet VPN (EVPN) with virtual switch support to enable multiple tenants with independent VLAN and subnet space within an EVPN instance. Virtual switch provides the ability to extend Ethernet VLANs over a WAN using a single EVPN instance while maintaining data-plane separation between the various VLANs associated with that instance. A single EVPN instance can stretch up to 4094 bridge domains defined in a virtual switch to remote sites.

When configuring virtual switch for EVPN, be aware of the following considerations:

  • Due to default ARP policing, some of the ARP packets not destined for the device can be missed. This can lead to delayed ARP learning and synchronization.

  • Clearing ARP for an EVPN can lead to inconsistency between the ARP table and the EVPN ARP table. To avoid this situation, clear both ARP and EVPN ARP tables.

  • The vlan-tag can be configured for local switching. However, vlan-tagged VLANs should not be extended over the EVPN cloud.

This task explains how to configure one Virtual Switch instance that includes one VLAN.

  1. Configure the virtual switch routing instance.
  2. Configure the interface names for the virtual switch routing instance.
  3. Configure the route distinguisher for the virtual switch routing instance.
  4. Configure the VPN routing and forwarding (VRF) target community for the virtual switch routing instance.
  5. List the VLAN identifiers that are to be EVPN extended.
  6. Configure the VLAN and VLAN ID for the virtual switch routing instance.
  7. Configure VXLAN encapsulation and Virtual Network Identifier for the virtual switch routing instance.
  8. Configure the virtual tunnel endpoint source interface for the virtual switch routing instance.
  9. Verify and commit the configuration.