EVPN for MPLS Tunnels in E-Tree Services

EVPN E-Tree services are modeled as VPLS services configured as E-Trees with the bgp-evpn mpls context enabled.

The following example shows a CLI configuration of a VPLS E-Tree service with EVPN E-Tree service enabled.

*A:PE1>config>service>system>bgp-evpn#
  evpn-etree-leaf-label
*A:PE1>config>service# vpls 1 customer 1 etree create 
*A:PE1>config>service>vpls(etree)# info 
----------------------------------------------
  description "ETREE-enabled evpn-mpls-service"
  bgp-evpn
    evi 10
    mpls bgp 1
      no shutdown
      ecmp 2
      auto-bind-tunnel resolution any
      ingress-replication-bum-label
  sap lag-1:1 leaf-ac create 
  exit
  sap 2/1/1:1 leaf-ac create 
  exit
  sap 2/2/2:1 create 
  exit
  spoke-sdp 3:1 leaf-ac create 
  exit

The following configuration guidelines apply to the EVPN E-Tree service.

• Before configuring an EVPN E-Tree service, the user must first run the evpn-etree-leaf-label <value> command. This is relevant for EVPN E-Tree services only. The command allocates an E-Tree leaf label on the system and, when a specific value is configured, the leaf label must match on all other PE nodes attached to the same EVPN service.

  Optionally, the evpn-etree-leaf-label <value> command may be configured with a static label value (within the static label range configured in the system using the config>router>mpls>mpls-label>static-label-range context). The static label is used when global leaf labels are needed in the network. For example, the case where at least one 7250 IXR Gen 1 router is attached to the EVPN E-Tree service.

• The configure service vpls create etree command is compatible with the bgp-evpn mpls context.

• As in VPLS E-Tree services, an AC that is not configured as a leaf AC is treated as root AC.

• MAC addresses learned over a leaf AC SAP or SDP binding are advertised as leaf MAC addresses.

• Any PE with one or more bgp-evpn enabled VPLS E-Tree service advertises an AD per-ES per-PE route with the leaf indication and leaf label used for BUM egress filtering.

• Any leaf AC SAP or SDP binding defined in an ES triggers the advertisement of an AD per-EVI route with the leaf indication.

• EVPN E-Tree services use the following CLI commands:

  • sap sap-id leaf-ac create command using the configure service vpls context

  • mesh-sdp sdp-id:vc-id create leaf-ac command using the configure service vpls context

  • spoke-sdp sdp-id:vc-id create leaf-ac command using the configure service vpls context

• The root-leaf-tag command is blocked in VPLS E-Tree services where bgp-evpn mpls context is enabled.