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Configuring EVPN Active-Standby Multihoming

You can configure an Ethernet VPN (EVPN) with multihoming support to provide multihoming functionality with active-standby redundancy mode of operation in the EVPN and virtual switch routing instance. This mode enables autodiscovery of Ethernet segments, Ethernet segment route construction, and Ethernet segment identifier (ESI) label assignment.

When configuring active-standby EVPN multihoming, be aware of the following limitations:

  • An interface or ESI can be attached to more than one EVPN instance (EVI), with a maximum limit of 200 EVIs per ESI.

  • For an EVPN routing instance, only one logical interface per physical interface or ESI can be attached to an EVI.

  • For a virtual switch routing instance, only one logical interface per physical interface or ESI can be configured under a bridge domain.

  • All the PE routers in the network topology should be running Junos OS Release 14.1 or later releases, which are based on the EVPN draft-ietf-l2vpn-evpn-03. Junos OS releases prior to 14.1 support the older version of the EVPN draft, causing interoperability issues when Junos OS Release 14.1 and a previous release are running.

Before you begin:

  1. Configure the router interfaces.

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

  3. Configure OSPF or any other IGP protocol.

  4. Configure a BGP internal group.

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

  6. Configure LDP.

  7. Configure MPLS.

  8. Configure RSVP MPLS LSP or GRE tunnels.

To configure the PE device:

  1. Enable EVPN active-standby multihoming on the multihomed interfaces.

    For example:

  2. Configure the routing instance for the active-standby mode of redundancy.

    The active-standby multihoming can be configured under any EVPN routing-instance. Both evpn and virtual-switch instance types are supported in active-standby EVPN multihoming. The vrf routing-instance is configured to illustrate the EVPN IRB functionality, in addition to multihoming, and is not mandatory for the active-standby EVPN multihoming feature to work. For example:



  3. Verify and commit the configuration.

    For example: