IEEE 802.1BR-2012 pdf download IEEE Standard for Local and metropolitan area networks- Virtual Bridged Local Area Networks- Bridge Port Extension
3. Definitions
For the purposes of this document, the definitions in Clause 3 of IEEE Std 802.10 and the following termsand definitions apply.’The IEEE Standards Dictionary Online should be consulted for terms not defined inthis clause.0
Aggregating Port Extender: A Bridge Port Extender that supports the full E-channel Identifier (E-CID)space and is capable of aggregating base Port Extenders.
Base Port Extender: A Bridge Port Extender that supports a subset of the E-channel ldentifier (E-CID)space.
Bridge Port Extender: A device used to extend the MAC service of a C-VLAN component to form aControlling Bridge and to extend the MAC service of a Controlling Bridge to form an Extended Bridge.
Cascade Port: A Port of a Controlling Bridge or Bridge Port Extender that connects to an Upstream Port, lnthe case of the connection belween two Bridge Port Extenders, the Cascade Port is the Port closest to theControlling Bridge.
Controlling Bridge: A Bridge that supports one or more Bridge Port Extenders.
E-channel: An instance of the MAC service supported by a set of two E-paths forming a bidirectionalservice. An E-channel is point-to-point or point-to-multipoint.
E-channel Identifier (E-CID): A value conveyed in a E-TAG that identifies an E-channel
E-path:Aconfigured unidirectional connectivity path between an internal Extended Port and one or moreexternal Extended Ports and/or Upstream Ports. E-paths originating from the Internal Bridge Port Extendercan be point-to-point or point-to-multipoint. E-paths originating from an External Bridge Port Extender canbe point-to-point or multipoint-to-point.
E-TAG: A tag header with a Tag Protocol ldentification value allocated for “IEEE 802.1BR E-Tag Type.
Extended Bridge: A Controlling Bridge and at least one Bridge Port Extender under the ControllingBridge’s control.
Extended Port: A Port ofa Bridge Port Extender that is not operating as a Cascade Port or Upstream PortThis includes the Ports of a Bridge Port Extender connected via internal LANs to the Port of a C-VLANcomponent within a Controlling Bridge.
External Bridge Port Extender: A Bridge Port Extender that is not physically part of a Controlling Bridgebut is controlled by the Controlling Bridge.
external Extended Port: An Extended Port that is part of an External Bridge Port Extender.
Internal Bridge Port Extender: A Bridge Port Extender that is physically part of a Controlling Bridge
internal Extended Port: An Extended Port that is part of an Internal Bridge Port Extender