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Feature Description - MPLS 01
NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Feature Description - MPLS

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Technical Overview

Technical Overview

Related Concepts

Table 4-2 Related Concepts



MPLS TE tunnel

Multiple LSPs are bound together to form an MPLS TE tunnel. An MPLS TE tunnel is uniquely identified by the following parameters:
  • Tunnel interface: a P2P virtual interface that encapsulates packets. Similar to a loopback interface, a tunnel interface is a logical interface. A tunnel interface name is identified by an interface type and number. The interface type is "tunnel." The interface number is expressed in the format of SlotID/CardID/PortID.
  • Tunnel ID: a decimal number that identifies an MPLS TE tunnel and facilitates tunnel planning and management. A tunnel ID must be specified before an MPLS TE tunnel interface is configured.
Figure 4-3 MPLS TE Tunnel and LSPs
A primary LSP with an LSP ID 2 is established along the path LSRA → LSRB → LSRC → LSRD → LSRE on the network shown in Figure 4-3. A backup LSP with an LSP ID 1024 is established along the path LSRA → LSRF → LSRG → LSRH → LSRE. The two LSPs are in a tunnel named Tunnel1 with a tunnel ID 100.


LSPs in an MPLS TE tunnel are constraint-based routed LSPs (CR-LSPs).

Unlike Label Distribution Protocol (LDP) LSPs that are established using routing information, CR-LSPs are established based on bandwidth and path constraints in addition to routing information.

MPLS TE Tunnel Establishment and Application

An MPLS TE tunnel is established using four components. Table 4-3 lists the components and describes their functions.

Table 4-3 MPLS TE components





Information Advertisement Component

Extends an IGP to advertise TE information, in addition to routing information. TE information includes the maximum link bandwidth, maximum reservable bandwidth, reserved bandwidth, and link colors.

Every node collects TE information about all nodes in a local area and generates a traffic engineering database (TEDB).


Path Selection Component

Runs Constraint Shortest Path First (CSPF) and uses TEDB data to calculate a path that satisfies specific constraints. CSPF evolves from the Shortest Path First (SPF) protocol. CSPF excludes nodes and links that do not satisfy specific constraints and uses the same algorithm that SPF supports to calculate a path.


Path Establishment Component

Establishes the following types of CR-LSPs:
  • Static CR-LSP: set up by manually configuring labels and bandwidth, irrespective of signaling protocols or path calculation. Setting up a static CR-LSP consumes few resources because no MPLS control packets are exchanged between two ends of the CR-LSP. The static CR-LSP cannot be adjusted dynamically in a changeable network topology; therefore, the static CR-LSP is not widely used.
  • Dynamic CR-LSP: established using RSVP-TE signaling. RSVP-TE carries parameters, such as the bandwidth, explicit routes, and affinities. There is no need to manually configure each hop along a dynamic CR-LSP. Dynamic CR-LSPs apply to large-scale networks.


Traffic Forwarding Component

Directs traffic to a CR-LSP and forwards the traffic along the CR-LSP. Although a CR-LSP can be established using the preceding three components, the CR-LSP cannot automatically import traffic. The traffic forwarding component can be used to direct traffic to the CR-LSP.

A network administrator can configure link and tunnel attributes to enable MPLS TE to automatically establish a CR-LSP. The network administrator can then direct traffic to the CR-LSP and forward traffic over the CR-LSP.

Updated: 2019-01-14

Document ID: EDOC1100058933

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