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FACT Protocol: Forwarding and Control Element Protocol

FACT Protocol is a robust and reliable protocol for interconnecting network elements. It uses TCP as the transport protocol and TLS for secure communication. It supports scalability, multihop networks, and prioritization. FACT provides features like redundancy, topology exchange, packet redirection, command bundling, and protection against DoS attacks.

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FACT Protocol: Forwarding and Control Element Protocol

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  1. Forwarding and Control Element Protocol (FACT) by Ram Gopal, Alex Audu, Chaoping Wu, Hormuzd Khosravi <draft-gopal-forces-fact-05.txt>

  2. FACT Protocol Updates • Incorporated feedback from last IETF meeting • Reduced mandatory implementation options for transport, security to help with Interoperability – design principles in RFC 1958, 2360 • FACT uses TCP as transport protocol for control channel over IP interconnection • FACT may use DCCP as transport for data channel • FACT uses TLS for security over IP interconnection • FACT will use single encapsulation scheme for payload, depending on the data model discussions • Increased priority bit filed to 3 , i.e. 8 priority levels • Made other fixes to the text

  3. Protocol Requirements Compliance(1) • Configuration of Modeled Elements • Capability and Control Message Class -> Configure Request/Response, Capability Request/Response messages • Support for secure communication • FACT uses TLS for communication in un trusted environment • For physically secure environment, protocol security functions can be turned off • FACT recommends rate limiting mechanisms on FE for protection against DoS attacks • Scalability • FACT uses 16-bit addressing for CEs, FEs that allows 64K CEs, FEs – Minimize the message updates • FACT uses congestion aware transport which helps scalability of network element

  4. Protocol Requirements Compliance (2) • Multihop • FACT uses TCP which is congestion aware and meets transport requirements for multi-hop IP networks • Message Priority • FACT supports 8 levels of message priority using 3 priority bits in common header • Reliability • FACT uses reliable transport protocol • For IP interconnection, FACT uses TCP for the control channel to provide reliability • FACT also has Response/Ack messages that provide application/protocol level responses

  5. Protocol Requirements Compliance (3) • Interconnect Independence • FACT uses interconnect independent addressing in its common header (CE Tag, FE Id) • For non-IP interconnects, an interconnect specific encapsulation will have to be defined • For IP interconnects, FACT uses TCP as transport • CE Redundancy or Failover • FACT uses heartbeat messages to determine loss of association between protocol elements • FACT provides mechanisms for CE failover (strong consistency, weak consistency) • Topology Exchange • Capability and Control Message Class -> Topology Request/Response messages

  6. Protocol Requirements Compliance (4) • Packet Redirection/Mirroring • Traffic Maintenance Message Class -> CP Redirect, CP Forward messages sent over Data Channel • Event Register/Deregister messages used to specify which packets to be redirected • Dynamic Association • Connection and Association Message Class -> Join Request/Response, Leave Request/Response messages • Command bundling • FACT uses multiple TLVs in its message payload to support command bundling • FACT also supports 2-phase commit operations

  7. Protocol Requirements Compliance (5) • Asynchronous Event Notification • Event Notification Message Class -> Asynchronous FE Event Notification message • Query Statistics • Capability and Control Message Class -> Query Request/Response message • Protection against Denial of Service (DoS) attacks • FACT uses separate Control and Data channels to provide robustness against DoS attacks • FACT’s configure Request/Response messages can be used to configure rate-limiting mechanisms on FE

  8. Summary • FACT protocol meets all ForCES Requirements • FACT reuse protocols that are widely available • Some of the key features • Separation of data and control for robustness • Reliability with congestion control over IP interconnection • Scalability, Grouping e.g.., FE and CE identifiers • PE state messages to determine state of protocol elements • FACT enables protocol interoperability over IP by reducing the mandatory implementation options for transport, security and payload encapsulation

  9. Questions

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