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Let us review one less known option: use distributed inter-domain SR-TE and leverage BGP-LS to populate Traffic-Engineering Databases (TED). Why BGP-LS? Some networking people would know BGP-LS as a means for sending TE information from a network to a controller like Paragon Pathfinder
See matching posts in thread - Link information export from TED database to Par...
Is there any integration of SPRING with BGP-LS, which can enable BGP-LS to carry SPRING updates and in turn enable an SDN controller to take approproate decisions? SPRING and BGP-LS are orthogonal (note that other - non "-LS" extensions to BGP exist to carry SPRING labels). BGP-LS is used by an SDN controller to collect the TE database from the network, whereas RSVP or SPRING might be used by the router to establish TE tunnels in the network, as instructed by the SDN controller through the Path Computation Element Protocol (PCEP). The current implementation of Juniper Networks SDN WAN controller (that is, NorthStar) supports the combination of BGP-LS (to collect the TE database) and PCEP with RSVP extensions (to administer TE tunnels), whereas the new release coming out this year (2016) will support combinations of BGP-LS, PCEP with RSVP extensions, and PCEP with SPRING extensions
This could also could be any file. 'ls -l' says the file is writeable
For example, if the routing instance RI is configured within the logical system LS, that routing instance must be encoded within a community string as LS/RI@public
87EC0384-120A-4299-8738-40CF0EE15192-1-Customer-LS-Configuration.txt