No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


NE20E-S V800R010C10SPC500 Configuration Guide - MPLS 01

This is NE20E-S V800R010C10SPC500 Configuration Guide - MPLS
Rate and give feedback :
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring PCE+ to Calculate Paths for MPLS TE Tunnels

Configuring PCE+ to Calculate Paths for MPLS TE Tunnels

The PCE function is used to calculate a path over which an MPLS TE tunnel is established, which more efficiently uses network resources than constrained shortest path first (CSPF).

Usage Scenario

Ingress nodes run the CSPF algorithm and use information stored in the traffic engineering database (TEDB) to calculate paths for MPLS TE tunnels. On an MPLS TE network, multiple tunnels originate from different ingress nodes and are established over paths that the ingress nodes independently calculate. As a result, network-wide resources cannot be efficiently used.

The PCE+ solution can help resolve the preceding issue. PCE+ devices are classified as servers and clients. A server calculates paths and stores network-wide path information. A client initiates a request to calculate a path and functions as the ingress. After the client sends a request to the server, the server calculates a path based on the network resources, which achieves optimal network resource usage.

The NE20E can function as a PCE client.

Different from CSPF configured on the ingress, the PCE algorithm allows a PCE server to configure and manage network-wide TE information, including node, link, and tunnel attributes. Some steps in the following procedures are mandatory when CSPF is used, while are optional when PCE is used.

Pre-configuration Tasks

Before configuring the PCE+ to calculate paths for MPLS TE tunnels, complete the following tasks:


If a PCE server is used to configure and manage network-wide TE information and the PCE server and client have the same parameters, the configurations on the PCE server take precedence. For example, the bandwidth is set to 1000 kbit/s on a tunnel interface of a PCE client, and the bandwidth is set to 2000 kbit/s for the same tunnel on a PCE server. Only the bandwidth configured on the PCE server is used to calculate a path. If a tunnel attribute is configured on a PCE client, not on a PCE server, the attribute can take effect on the tunnel.

To improve the reliability of a TE tunnel established using PCE+, configure CR-LSP hot standby on the tunnel interface on which the TE tunnel is established.

Configuration Procedures

Figure 3-3 Flowchart for configuring a PCE client
Updated: 2019-01-03

Document ID: EDOC1100055103

Views: 19474

Downloads: 35

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Previous Next