Label%20Switched%20Ethernet%20(LSE)%20Architecture

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Label Switched Ethernet (LSE) Architecture

• 2005. Nov. 8
• Jaihyung Cho
• Jaihyung_at_etri.re.kr
• draft-jaihyung-ccamp-lse-architecture-00.txt

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Proposed Label Structure

• ONE of the Solutions Presented to GELS BoF so far
• Use Lower 24bit of MAC Address for Ethernet Label
• Obtain 24bit of OUI Number from IEEE
• Bi-directional Label (Includes Up/Down Stream
  Label)
• - Simple to send FEEDBACK to Ingress if something
  wrong
• May use with 802.1Q (VLAN)

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Straightforward Implementation

• Ingress Encapsulates IP Packets in GMPLS-Ethernet
  Frames
• GMPLS Core Bridges Forward Ethernet Frames to
  Egress Edge
• Edges Must Divide 224(16,777,216) Label Space
  (Address Block)
• Label is NOT Swapped in This Model

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Label Swapping at Edge
Invariant Region
Label Swapping Edge
Label Swapping Edge

• MAC Address Label May be Invariant in Local Range
• It Needs to be Swapped at Different
  Administrative Domain
• e.g.) Between Provider Network
• MAC Address is NOT Unique
• Label Swapping Improves Scalability (Global
  Scale)
• Label Swapping Allows Local Assignment

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MAC-in-MAC Tunneling

• User Frame can be Encapsulated by Provider MAC
• MAC-in-MAC performs better than Q-in-Q
• - No MAC Explosion Problem
• Edge Bridge Requires Encapsulation Capability

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Why LSE is Good ?

• Does Not Change Ethernet Behavior
• MAC Learning, Spanning Tree, Broadcasting, VLAN,
  
• Non-GMPLS Frame Flows are NOT Affected At All
• Ethernet, GMPLS are Bi-directional ? So is LSE
• Semantic Change of MAC address ? ? no side-effect
• Backward Compatible with 802.1D/Q Bridges
• NO-Homogeneous Deployment !!!
• LSE only Controls GMPLS prefixed Frames
• Smooth Transition from Ethernet ? GMPLS
• Good to apply in Aggregation/Core Network
• Considering Future Extension to Local/Access