IEEE 802.1ah-2008

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Provider Backbone Bridging ( PBB , also known as mac-in-mac ) is a technology specified in the IEEE 802.1ah-2008 standard for the transport of data from a customer network via a provider network. IEEE 802.1ah has been integrated into the IEEE 802.1Q-2011 standard.

PBB enables a complete separation of customer and provider domains. A new Ethernet header was defined for this. This header can take several different forms, but the main components of the header are:

  • Backbone component with:
    • Backbone destination address (B-DA) (six bytes)
    • Backbone Source Address (B-SA) (six bytes)
    • EtherType 0x88A8 "Service / Backbone VLAN" (two bytes)
    • B-TAG / B-VID as backbone VLAN indicator (two bytes)
  • Service encapsulation with:
    • EtherType 0x88E7 "Backbone Service Instance" (two bytes)
    • Flags for priority included, Drop Eligible Indicator (DEI) and No Customer Address (NCA) indication (e.g. OAM frame).
    • I-SID, the service ID (three bytes)
  • Original customer frame
    • Customer target address (six bytes)
    • Customer source address (six bytes)
    • EtherType 0x8100 "Customer VLAN" (two bytes)
    • Customer VLAN ID (two bytes)
    • EtherType of the user data (e.g. 0x0800 for IPv4 or 0x86DD for IPv6)
    • Payload

literature

  • Tyson T. Brooks: Cyber-Assurance for the Internet of Things. John Wiley & Sons Inc, New Jersey 2017, ISBN 978-1-119-19386-9 .

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