http://tools.ietf.org/html/rfc6790 published in November 2012
entropy用完了, 生一個來用
LSR能用來hash的seed不足以引進變異
an ingress LSR (e.g., a PE router) has detailed knowledge of a packet's contents, typically through a priori configuration of the encapsulations that are expected at a given PE-CE interface, (e.g., IPv4, IPv6, VPLS, etc.)
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