Comment 25 for bug 1679198

Reviewed: https://review.opencontrail.org/34158
Committed: http://github.com/Juniper/contrail-controller/commit/0266efd10773a03334df74f92794911b44c8c5fa
Submitter: Zuul (<email address hidden>)
Branch: master

commit 0266efd10773a03334df74f92794911b44c8c5fa
Author: Sandeep Shah <email address hidden>
Date: Sun Jul 30 20:26:55 2017 -0500

Code changes to address an issue with RD Collision

In large Contrail deployments, compute IP addreses are often reused
across data centers, causing a RD Collision issue, when data centers
are inter-connected through a hierarchical BGP topology.

The implemented solution involves a configurable seeding parameter
at control nodes to make the generated RD unique. Specifically,
the operator configures a 2-byte route_distinguisher_cluster_seed
that is guaranteed to be unique across all managed clusters.

Change-Id: I4154f17cdbb74dc6269b07c265b24580b72d6b96
Closes-Bug: #1679198
Implements: blueprint user-defined-rd-range