Hash Label

The hash label is supported on VLL, VPRN, or VPLS services bound to any MPLS type encapsulated SDPs, as well as to a VPRN service using auto-bind-tunnel with the resolution-filter set to any MPLS tunnel type. When enabled, the ingress data path is modified such that the result of the hash on the payload packet header is communicated to the egress data path for use as the value of the label field of the hash label. The egress data path appends the hash label to the bottom of the stack (BoS) and sets the S-bit to 1. The user enables the signaling of the hash-label capability under a VLL spoke SDP, a VPLS spoke SDP or mesh SDP, or an IES or VPRN spoke SDP interface by adding the signal-capability option. When this capability is enabled, the decision to insert the hash label on the user and control plane packets by the local PE is determined by the outcome of the signaling process and may override the local PE configuration.