Configuring E-PW APS

This chapter applies only to the NetEngine 8000 F1A.

Context

E-PW APS applies to 3PE scenarios in which two CEs asymmetrically access three PEs over PWs. On the two PEs to which a CE is dual-homed, E-Trunk is used to determine the AC-side active/standby status.

The PWs can be either SS-PWs or MS-PWs. When PW OAM detects a fault on the active PW, it immediately notifies E-PW APS of the fault, which is then triggered to perform an active/standby PW switchover. See Figure 1 and Figure 2.

Figure 1 E-PW APS networking for MS-PWs

Figure 2 E-PW APS networking for SS-PWs

Pre-configuration Tasks

Before configuring PW protection, complete the following tasks:

• Configure IP addresses and an IGP on PEs.

• Establish public network tunnels between PEs. The public network tunnels can be:

  • LDP tunnel: To establish an LDP tunnel, you must enable MPLS and MPLS LDP both globally and per interface on each public network node along the tunnel. If two PEs are indirectly connected, establish a remote LDP session between them.

  • TE tunnel: To establish a TE tunnel, you must enable MPLS, MPLS TE, and RSVP-TE both globally and per interface on each public network node along the tunnel, and enable CSPF in the MPLS view of the tunnel ingress.

• Enable MPLS L2VPN on PEs.