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Configuring EVPN Active-Standby Multihoming to a Single PE Device

 

You can configure EVPN active-standby multihoming on a single PE device by configuring a standby (protect) interface to provide redundancy to an active (protected) interface. Figure 1 illustrates an EVPN topology with active-standby multihoming to a single PE device. A protect interface provides the benefit of a backup for the protected primary interface in case of failure. The PE device uses the primary interface for network traffic while the primary interface is functioning. If the primary interface fails, the protect interface becomes active and traffic switches to the protect interface. When the primary interface returns, the primary interface becomes the active interface once again.

Note

If connectivity fault management (CFM) is enabled, the protect interface will trigger CFM to send Type, Length, and Value (TLV) or Remote Defect Indication (RDI) interface status to the customer edge device

Junos OS does not support the protect interface in the following cases:

  • EVPN-VXLAN

  • PBB-EVPN

  • On an interface that has been configured as an ESI in EVPN multihoming

Figure 1: EVPN Active-Standby Multihoming on a Single PE Device
EVPN Active-Standby Multihoming
on a Single PE Device

To configure the protect interface in a routing instance, configure both the protect interface and the primary interface in the routing instance for EVPN and include the protect-interface statement in the primary interface hierarchy.

To configure the protect interface in a routing instance, configure both the protect interface and the primary interface in the routing instance for EVPN-VPWS and include the protect-interface statement in the evpn protocol hierarchy.

To configure the protect interface in a bridge domain, configure both the protect interface and the primary interface in the bridge domain and include the protect-interface statement in the primary interface hierarchy.

To display the protect interface, use the show evpn instance extensive operational command.

user@PE1> show evpn instance extensive

The show interfaces detail command shows that the protect interface has a CCC-DOWN status

user@PE1> show interfaces ae0.0 detail

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