Weighted ECMP for IES or VPRN Layer 3 spoke SDP interfaces, Epipe and Ipipe services with SDPs, and VPLS services with spoke or mesh SDPs is enabled using the config>service>sdp>weighted-ecmp command. This command is applicable when the SDP has RSVP-TE LSPs configured using the config>service>sdp>lsp command or SR-TE LSPs configured using the config>service>sdp>sr-te-lsp command.
When weighted ECMP is enabled on an SDP, a path is selected based on the configured hash. Paths are then load-balanced across the LSPs used by the SDP according to the normalized LSP load-balancing weight configured using the load-balancing-weight command. This means that consecutive packets of a particular service use the same LSP, but the overall load handled by LSPs to the SDP far end is balanced according to the load-balancing weight if all services using the SDP send the same bandwidth and there are more services using the SDP than there are LSPs for the SDP.
If an LSP in the ECMP set has no load-balancing weight configured, ECMP is applied to packets based on the output of the hash for the service ID.