PBB
PBB 802.1ah PBB or MAC-in-MAC)
graph LR
CE1([CE]) ---|UNI .1ad| PEB1[PEB]
CE2([CE]) ---|UNI .1ad| PEB2[PEB]
subgraph AL["Access Network · 802.1ad"]
PEB1 --- PBa1[PB]
PEB2 --- PBa1
PBa1 --- PBa3[PB]
PBa1 --- PBa2
PBa2[PB] --- PBa3[PB]
end
PBa3 ---|UNI .1ah| BEB1
PBa3 ---|UNI .1ah| BEB2
subgraph CORE["Core Network · 802.1ah"]
BEB1[BEB] --- BCB1[BCB]
BEB2[BEB] --- BCB1
BCB1 --- BCB2[BCB]
BCB2 --- BCB3
BCB1 --- BCB3[BCB]
BCB3 --- BEB3[BEB]
end
BEB3 ---|UNI .1ah| PBb1
subgraph AR["Access Network · 802.1ad"]
PBb1[PB] --- PBb3[PB]
PBb1 --- PBb2
PBb2[PB] --- PBb3
PBb3 --- PEB3[PEB]
end
PEB3 ---|UNI .1ad| CE3([CE])
Terms
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PB: Provider Bridge.
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PEB: Provider Edge Bridge.
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B-Component: A bridging component contained in a BEB that bridges in provider space (Backbone MAC addresses, B-VLAN).
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BCB: Backbone Core Bridge, An S-VLAN bridge used within the core of a PBBN.
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BEB: Backbone Edge Bridge, A backbone edge bridge positioned at the edge of PBBN that encapsulates customer frames for transmission across a PBBN.
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B-MAC: Backbone MAC Address. An individual MAC address associated with a Provider Instance Port (PIP) and used in creating the MAC header of I-tagged frames transmitted across a PBBN.
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Backbone Service Instance: An instance of the MAC service in a PBBN provided between two or more Virtual Instance Ports (VIPs) in BEBs.
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I-SID: Backbone Service Instance Identifier. A 24-bit field of the backbone service instance tag (I-TAG) that identifies the backbone service instance of a frame. The I-SID defines the service instance that the frame should be “mapped to”.
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I-TAG Backbone Service Instance Tag. A tag with a Ethertype value allocated for IEEE 802.1q backbone service instance tag type.
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B-TAG: Backbone VLAN Tag. A field defined in IEEE 802.1ah provider MAC encapsulation header that conveys the backbone VLAN ID information. The format of the B-TAG is same as that of an IEEE 802.1ad S-TAG field.
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CBP: Customer Backbone Port. A BEB port that can receive and transmit I-tagged frames for multiple customers,
and can assign B-VIDs (backbone VLAN IDs) and translate I-SID on the basis of the received I-SID.
- I-Component: A bridging component contained in a BEB that bridges in the Customer space (Customer MAC addresses, S-VLAN).
- PIP: Provider Instance Port. The set of Virtual Instance Ports (VIPs) that are supported by a single instance.
- Service frame: A frame exchanged between a provider and a customer.
- VIP: Virtual Instance Port. A bridge port on an I-Component in BEB that provides access to a single backbone service instance.