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color
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See link coloring.
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Constrained Shortest Path First (CSPF)
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MPLS algorithm that has been modified to include specific restrictions
for calculating the shortest path across the network.
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customer edge (CE) device
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Services Router or switch in the customer's network that is connected
to a service provider's provider edge (PE) router and participates in a Layer 3
VPN.
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Explicit Route Object (ERO)
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Extension to the Resource Reservation Protocol (RSVP) that allows an
RSVP PATH message to traverse an explicit sequence of routers independently
of conventional shortest-path IP routing.
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inbound router
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Entry point for a label-switched path (LSP). Each LSP must have exactly
one inbound router that is different from the outbound router. Inbound routers
are also known as ingress routers. See also outbound router.
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label
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In Multiprotocol Label Switching (MPLS), a 20-bit unsigned integer in
the range 0 through 1,048,575, used to identify a packet traveling along a
label-switched path (LSP).
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Label Distribution Protocol (LDP)
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Protocol for distributing labels in non-traffic-engineered applications.
LDP allows Services Routers to establish label-switched paths (LSPs) through
a network by mapping Network layer routing information directly to Data Link
layer switched paths.
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label-switched path (LSP)
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Sequence of Services Routers that cooperatively perform Multiprotocol
Label Switching (MPLS) operations for a packet stream. The first router in
an LSP is called the inbound router, and the last router in the path is called
the outbound router. An LSP is a point-to-point, half-duplex connection from
the inbound router to the outbound router. (The inbound and outbound routers
cannot be the same router.)
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label-switching router (LSR)
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Any Services Router that is part of an LSP.
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Layer 2 circuit
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Point-to-point Layer 2 connection transported by means of Multiprotocol
Label Switching (MPLS) or another tunneling technology on a service provider’s
network. Multiple Layer 2 circuits can be transported over a single label-switched
path (LSP) tunnel between two provider edge (PE) routers.
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Layer 2 VPN
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Private network service among a set of customer sites that use a service
provider's existing Multiprotocol Label Switching (MPLS) and IP network. One
customer's data is separated from another's by software rather than hardware.
In a Layer 2 VPN, the Layer 3 routing of customer traffic occurs within
the customer network.
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Layer 3 VPN
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Private network service among a set of customer sites that use a service
provider's existing Multiprotocol Label Switching (MPLS) and IP network. One
customer's routes and data are separated from another customer's routes and
data by software rather than hardware. In a Layer 3 VPN, the Layer 3
routing of customer traffic occurs within the service provider network.
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link coloring
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In Constrained Shortest Path First (CSPF) routing, a way to group Multiprotocol
Label Switching (MPLS) interfaces for CSPF path selection by assigning a color
identifier and number to each administrative group.
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Multiprotocol Label Switching (MPLS)
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Method for engineering network traffic patterns by assigning short labels
to network packets that describe how to forward the packets through the network.
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multiple push
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Addition by a Services Router of up to three labels to a packet as
it enters a Multiprotocol Label Switching (MPLS) domain.
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outbound router
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Exit point for a label-switched path (LSP). Each LSP must have exactly
one outbound router that is different from the inbound router. Outbound routers
are also called egress routers. See also inbound router.
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penultimate hop popping (PHP)
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Using the penultimate router rather than the outbound router in a label-switched
path (LSP) to remove the Multiprotocol Label Switching (MPLS) label from a
packet.
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penultimate router
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Second-to-last Services Router in an LSP. The penultimate router is
responsible for label popping when penultimate hop popping (PHP) is configured.
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pop
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Removal by a Services Router of the top label from a packet as it
exits the Multiprotocol Label Switching (MPLS) domain.
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provider edge (PE) router
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Services Router in the service provider network that is connected
to a customer edge (CE) device and participates in a virtual private network
(VPN).
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provider router
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Services Router in the service provider’s network that does
not attach to a customer edge (CE) device.
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push
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Addition of a label or stack of labels by a Services Router to a packet
as it enters a Multiprotocol Label Switching (MPLS) domain.
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Resource Reservation Protocol (RSVP)
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Resource reservation setup protocol that interacts with integrated services
on the Internet.
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route distinguisher
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A 6-byte virtual private network (VPN) identifier that is prefixed to
an IPv4 address to make it unique. The new address is part of the VPN-IPv4
address family, which is a Border Gateway Protocol (BGP) extension. A route
distinguisher allows you to configure private addresses within the VPN by
preventing any overlap with the private addresses in other VPNs.
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routing instance
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Collection of routing tables, their interfaces, and the routing protocol
parameters that control the information they contain.
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swap
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Replacement by a Services Router of a label or stack of labels on
a packet as it travels through a Multiprotocol Label Switching (MPLS) domain.
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swap and push
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Replacement and subsequent push by a Services Router of a label or
stack of labels on a packet as it travels through a Multiprotocol Label Switching
(MPLS) domain.
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traffic engineering database (TED)
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Database populated by label-switched path (LSP) information such as
the network topology, current reservable bandwidth of links, and link colors.
The traffic engineering database is used to determine Constrained Shortest
Path First (CSPF) path selection.
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transit router
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Any label-switching router (LSR) between the inbound and outbound Services Router of
a label-switched path (LSP).
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virtual private network (VPN)
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Private data network that uses a public TCP/IP network, typically the
Internet, while maintaining privacy with a tunneling protocol, encryption,
and security procedures.
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VPN routing and forwarding (VRF) instance
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Routing instance for a Layer 3 VPN implementation that consists of one
or more routing tables, a derived forwarding table, the interfaces that use
the forwarding table, and the policies and routing protocols that determine
what goes into the forwarding table.
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