Multi-Instance EVPN: EVPN-VXLAN and EVPN-MPLS in the same VPLS/R-VPLS service

SR OS supports a maximum of two BGP instances in the same VPLS/R-VPLS, where the two instances can be:

• One EVPN-VXLAN instance and one EVPN-MPLS instance
• Two EVPN-VXLAN instances
• Two EVPN-MPLS instances

This section describes the configuration aspects of a VPLS/R-VPLS with EVPN-VXLAN and EVPN-MPLS.

In a service where EVPN-VXLAN and EVPN-MPLS are configured together, the configure service vpls bgp-evpn vxlan bgp 1 and configure service vpls bgp-evpn mpls bgp 2 commands allow the user to associate EVPN-MPLS to a different instance from that associated with EVPN-VXLAN, and have both encapsulations simultaneously enabled in the same service. At the control plane level, EVPN MAC/IP advertisement routes received in one instance are consumed and readvertised in the other instance as long as the route is the best route for a specific MAC. Inclusive multicast routes are independently generated for each BGP instance. In the data plane, the EVPN-MPLS and EVPN-VXLAN destinations are instantiated in different implicit Split Horizon Groups (SHGs) so that traffic can be forwarded between them.

The following example shows a VPLS service with two BGP instances and both VXLAN and MPLS encapsulations configured for the same BGP-EVPN service.

*A:PE-1>config>service>vpls# info 
----------------------------------------------
  description "evpn-mpls and evpn-vxlan in the same service"
  vxlan instance 1 vni 7000 create
  exit
  bgp 
    route-distinguisher 10:2
    route-target target:64500:1
  exit
  bgp 2 
    route-distinguisher 10:1
    route-target target:64500:1
  exit
  bgp-evpn
    evi 7000
    incl-mcast-orig-ip 10.12.12.12
    vxlan bgp 1 vxlan-instance 1
      no shutdown 
    mpls bgp 2
      control-word
      auto-bind-tunnel 
        resolution any
      exit
      force-vlan-vc-forwarding
      no shutdown
    exit
  exit
  no shutdown

The following list describes the preceding example:

• bgp 1 or bgp is the default BGP instance

• bgp 2 is the additional instance required when both bgp-evpn vxlan and bgp-evpn mpls are enabled in the service

• The commands supported in instance 1 are also available in instance 2 with the following considerations:

  • pw-template-binding

    The pw-template-binding can only exist in instance 1; it is not supported in instance 2.

  • route-distinguisher

    The operating route-distinguisher in both BGP instances must be different.

  • route-target

    The route target in both instances can be the same or different.

  • vsi-import and vsi-export

    Import and export policies can also be defined for either BGP instance.

• MPLS and VXLAN can use either BGP instance, and the instance is associated when bgp-evpn mpls or bgp-evpn vxlan is created. The bgp-evpn vxlan command must include not only the association to a BGP instance, but also to a vxlan-instance (because the VPLS services support two VXLAN instances).

  Note: The bgp-evpn vxlan no shutdown command is only allowed if bgp-evpn mpls shutdown is configured, or if the BGP instance associated with the MPLS has a different route distinguisher than the VXLAN instance.

The following features are not supported when two BGP instances are enabled on the same VPLS/R-VPLS service:

• SDP bindings

• M-VPLS, I-VPLS, B-VPLS, or E-Tree VPLS

• Proxy-ARP and proxy-ND

• BGP Multihoming

• IGMP, MLD, and PIM snooping

• BGP-VPLS or BGP-AD (SDP bindings are not created)

The service>vpls>bgp-evpn>ip-route-advertisement command is not supported on R-VPLS services with two BGP instances.