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Configuring FAT Pseudowire Support for BGP VPLS to Load-Balance MPLS Traffic

 

The flow-aware transport (FAT) or flow label is supported for BGP-signaled pseudowires such as VPLS and is to be configured only on the label edge routers (LERs). This enables the transit routers or the label-switching routers (LSRs) to perform load balancing of MPLS packets across equal-cost multipath (ECMP) or link aggregation groups (LAGs) without the need for deep packet inspection of the payload. FAT pseudowires or flow label can be used with LDP-signaled VPLS with forwarding equivalence class (FEC128 and FEC129), and the support for flow label is extended for BGP-signaled pseudowires for point-to-point or point-to-multipoint Layer 2 services.

Before you configure FAT pseudowire support for BGP VPLS to load-balance MPLS traffic:

  • Configure the device interfaces and enable MPLS on all the interfaces.

  • Configure RSVP.

  • Configure MPLS and an LSP to the remote PE router.

  • Configure BGP and OSPF.

To configure FAT pseudowire support for BGP VPLS to load-balance MPLS traffic, you must do the following:

  1. Configure the sites connected to the provider equipment for a given routing instance for the VPLS protocols.
  2. Configure the VPLS protocol for the routing instance to provide advertising capability to pop the flow label in the receive direction to the remote PE.
  3. Configure the VPLS protocol to provide advertising capability to push the flow label in the transmit direction to the remote PE.