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Customer edge (CE) devices
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Routers or switches located at the customer site that connect
to the provider’s network. CE devices are typically IP routers,
but could also be an Asynchronous Transfer Mode (ATM), Frame Relay,
or Ethernet switch.
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Class of service (CoS)
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Method of classifying traffic on a packet-by-packet basis using
information in the type-of-service (ToS) byte to provide different
service levels to different traffic.
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Label switched path (LSP)
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Sequence of routers that cooperatively perform MPLS operations
for a packet stream. The first router in an LSP is called the ingress router and the last router in the path is called
the egress router. An LSP is a point-to-point,
half-duplex connection from the ingress router to the egress router.
(The ingress and egress routers cannot be the same router.)
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Media access control
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In the OSI seven-layer networking model defined by the IEEE,
MAC is the lower sublayer of the data link layer. The MAC sublayer
governs protocol access to the physical network medium. By using the
MAC addresses that are assigned to all ports on a router, multiple
devices on the same physical link can uniquely identify one another
at the data link layer.
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Multiprotocol Label Switching (MPLS)
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Mechanism for engineering network traffic patterns that functions
by assigning to network packets short labels that describe how to
forward them through the network. Also called label switching.
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Point-to-multipoint LSP
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RSVP-signaled LSP with a single source and multiple destinations.
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Provider edge (PE) router
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A router in the service provider’s network that is connected
to a customer edge (CE) device and participates in a virtual private
network (VPN or VPLS).
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Quality of service (QoS)
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Performance, such as transmission rates and error rates, of
a communications channel or system.
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Virtual private LAN service (VPLS)
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An Ethernet-based multipoint-to-multipoint Layer 2 VPN service
used for interconnecting multiple Ethernet LANs across an MPLS backbone.
VPLS is specified in IETF RFC 4761, Virtual Private LAN
Service (VPLS) Using BGP for Auto-Discovery and Signaling.
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