Communication%20within%20Clouds:%20Open%20Standards%20and%20Proprietary%20Protocols%20for%20Data%20Center%20Networking

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Communication within Clouds Open Standards and
ProprietaryProtocols for Data Center Networking

• IEEE Communications Magazine,  (Volume50 , 
  Issue 9 ) Authors Sher Decusatis, C.J.
  Carranza, A. Decusatis, C.M.

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Introduction
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Spanning Tree Protocol

• Spanning Tree Protocol (STP)
• layer 2 switching protocol used by classical
  Ethernet that ensures loop-free network
  topologies by always creating a single path tree
  structure through the network.
• Bridge

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Spanning Tree Protocol(cont.)
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TRILL

• TRILL is the Transparent Interconnection of Lots
  of Links.
• A protocol to perform Layer 2 bridging using
  Intermediate System to Intermediate System(IS-IS)
  link state routing.
• Routing Bridge(RBridge)

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TRILL(cont.)

• TRILL Header
• V (Version) 2-bit
• R (Reserved) 2 bit
• M (Multi-destination) 1 bit
• Op-Lng (Options Length) 5-bit
• Hop Count 6-bit
• Egress RBridge Nickname 16-bit identifier
• Ingress RBridge Nickname 16-bit identifier

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TRILL(cont.)
MAC Dst MAC src payload
RB5 MAC RB2 MAC RB5 MAC RB2 MAC MAC Dst MAC src payload
L2 L3 payload
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Ethernet Fabric

• ? Layer 2 ??????? Layer 3 ????????,????????????,??
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• Ethernet Fabric ?????????????? 

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Ethernet Fabric(cont.)
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Ethernet Fabric(cont.)
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Ethernet Fabric(cont.)
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SOFTWARE-DEFINED NETWORKINGAND OPENFLOW

• The OpenFlow standard moves the network control
  plane into software running on an attached server
  or network controller. The flow of network
  traffic can then be controlled dynamically,
  without the need to rewire the data center
  network.
• In cloud computing environments, OpenFlow
  improves scalability and enables multi-tenancy
  and resources pooling, and will likely co-exist
  with other Layer 2/3 protocols and network
  overlays for some time.

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Conclusion

• In this article, we have presented an overview of
  layer 2 and 3 protocols that may be used to
  address the unique requirements of a highly
  virtualized cloud data center.
• That enhance features of a flattened layer 2
  network (TRILL) or have the potential to enhance
  future systems (SDN).

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Reference

• RFC 6325