Dear TEAS, PCE, IDR, LSR, BESS, BIER Spring Working Groups, I have noticed that after reviewing many drafts across many WGs it seems in the industry that the lines seem to be blurred between a PCE controller, ODL or Openflow SDN Controller and a Netconf/Yang NMS Controller ZTP & Day X provisioning.
As this is a software sitting on a server you can have a swiss army knife server that does everything from PCE path computation to Netconf/Yang ZTP & Day N provisioning as well as any SDN Controller ODL or Openflow controller type functions as well. How this comes into play and realization of the lines being blurred is the use of BGP-LS in building the IGP topological graph of the network which was designed for PCEP and PCE & PCC active & passive off line path computation for both RSVP-TE or SR-TE path instantiation. However now BGP-LS can also be used for other functions now such as usage as I am a Shepherd reviewing a draft for BGP-LS usage for BIER to use BGP-LS to gather the elements internals within BIER using the same BGP-LS data structures to populate with BIER specific information to graph the BIER topology. So here we are not doing any path computations as we are using in this use case for NMS type function to gather data for ZTP & Day N provisioning. Similarly other use cases such as with TEAS TS-Transport slice and being able to provision TS and capturing the TS Enhanced VPN RT & resource information and leveraging BGP-LS to do the same data gathering & ZTP like controller style provisioning. It does seem as though BGP-LS as its a means of "data gathering" "dump truck" of anything with the kitchen sink included to build any type of topological graph of literally anything under the sun. I see that is a nice to leverage but it does in fact blur the lines of NMS Netconf/Yang Controller based functionality and PCE path computation functionality and SDN controller based ZTP functionality into a single ubiquitous server that can do all of the above and use BGP-LS to accomplish the "kitchen sink" tasks. It does however transform BGP to be an NMS tool but a "tool" and not just the original function which it was intended NLRI network reachability. Am I off base and please let me know as its BGP-LS is being way over leveraged. There are pros & cons to everything but I thought I would bring up to the WG as an important discussion point. Lots of food for thought. Welcome all comments as well as concerns related to this topic. Kind Regards, <http://www.verizon.com/> *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD
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