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Presentation: https://1drv.ms/p/s!ApCTkcuWhXSaii481vihnF43Sssz?e=95ptJQ

RFC 1142: OSI IS-IS Intra-domain Routing Protocol - https://tools.ietf.org/html/rfc1142

RFC 5880: Bidirectional Forwarding Detection (BFD) - https://tools.ietf.org/html/rfc5880