MPLS TE Configuration

This chapter describes the principles for Multiprotocol Label Switching Traffic Engineering (MPLS TE), Resource Reservation Protocol (RSVP) TE tunnels, RSVP signaling parameter adjustment, RSVP authentication, tunnel parameter adjustment, measures for adjusting TE forwarding, the bandwidth flood threshold, tunnel re-optimization, MPLS TE fast reroute (FRR), MPLS TE Auto FRR, constraints-routed label switched path (CR-LSP) backup, isolated LSP computation, RSVP graceful restart (GR), static bidirectional forwarding detection (BFD) for CR-LSP, dynamic BFD for CR-LSP, MPLS TE distribution, and how to configure MPLS TE, and provides configuration examples.

Overview of MPLS TE: The Multiprotocol Label Switching Traffic Engineering (MPLS TE) technology integrates the MPLS technology with TE. It reserves resources by establishing label switched paths (LSPs) over a specified path in an attempt to prevent network congestion and balance network traffic.

Configuration Precautions for MPLS TE

Configuring Static CR-LSP: This section describes how to configure a static CR-LSP. The configuration of a static CR-LSP is simple, and label allocation is performed manually, not by using a signaling protocol to exchange control packets, which consumes a few resources.

Configuring a Static Bidirectional Co-routed LSP: A static bidirectional co-routed label switched path (LSP) is composed of two static constraint-based routed (CR) LSPs in opposite directions. Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) supports MPLS forwarding in both directions along such an LSP.

Configuring an Associated Bidirectional CR-LSP: Associated bidirectional CR-LSPs provide bandwidth protection for bidirectional services. Bidirectional switching can be performed for associated bidirectional CR-LSPs if faults occur.

Configuring CR-LSP Backup: CR-LSP backup is configured to provide end-to-end protection for a CR-LSP.

Configuring Static BFD for CR-LSP: By configuring static BFD for CR-LSP, you can monitor a static CR-LSP or an RSVP CR-LSP.

Configuring Dynamic BFD for CR-LSP: Dynamic BFD for CR-LSP can be configured to monitor an RSVP CR-LSP and protect traffic along a CR-LSP.

Configuring an RSVP-TE Tunnel: MPLS TE reserves resources for RSVP-TE tunnels. These tunnels are established along specified paths, not passing through congested nodes, balancing traffic on a network.

Configuring an Automatic RSVP-TE Tunnel: Automatic RSVP-TE tunnels are generated using the PCE Initiated LSP protocol. Such tunnels do not need to be manually configured.

Adjusting RSVP Signaling Parameters: RSVP-TE supports various signaling parameters, which meet requirements for reliability and network resources, and requirements of MPLS TE advanced functions.

Configuring Dynamic BFD for RSVP: This section describes how to configure a dynamic BFD session to detect faults in links between RSVP neighbors.

Configuring Self-Ping for RSVP-TE: Self-ping is a connectivity check method for RSVP-TE LSPs.

Configuring RSVP Authentication: RSVP authentication is configured to protect a node from attacks and improve network security.

Configuring Whitelist Session-CAR for RSVP-TE: You can configure whitelist session-CAR for RSVP-TE to isolate bandwidth resources by session for RSVP-TE packets. This configuration prevents bandwidth preemption among RSVP-TE sessions in the case of a traffic burst.

Configuring an RSVP GR Helper: An RSVP GR Helper is configured to allow devices along an RSVP-TE tunnel to retain RSVP sessions during a master/backup switchover.

Configuring the Entropy Label for Tunnels: The entropy label can be used to improve load balancing in traffic forwarding.

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).

Configuring the IP-Prefix Tunnel Function: The IP-prefix tunnel function can be configured and used to establish P2P RSVP-TE tunnels in a batch, which simplifies the configuration.

Configuring Dynamic Bandwidth Reservation: This section describes how to configure dynamic bandwidth reservation on an MPLS TE interface. This configuration enables the MPLS TE interface dynamically reserve bandwidth for an MPLS TE tunnel to account for the fact that physical bandwidth is variable.

Adjusting Parameters for Establishing an MPLS TE Tunnel: Multiple attributes are used to establish MPLS TE tunnels flexibly.

Importing Traffic to an MPLS TE Tunnel: Before importing traffic to an MPLS TE tunnel, familiarize yourself with the usage scenario, complete the pre-configuration tasks for the configuration.

Configuring Static BFD for TE: This section describes how to configure static BFD for TE to detect faults in a TE tunnel.

Configuring MPLS TE Manual FRR: MPLS TE manual FRR is a local protection mechanism that protects traffic on a link or a node on a CR-LSP.

Configuring MPLS TE Auto FRR: MPLS TE Auto FRR is a local protection mechanism that protects traffic on a link or a node on a CR-LSP.

Configuring MPLS Detour FRR: MPLS detour FRR automatically creates a detour LSP on each eligible node along primary CR-LSP to protect downstream links or nodes.

Configuring a Tunnel Protection Group: This section describes how to configure a tunnel protection group. A protection tunnel can be bound to a working tunnel to form a tunnel protection group. If the working tunnel fails, traffic switches to the protection tunnel. The tunnel protection group helps improve tunnel reliability.

Configuring an MPLS TE Associated Tunnel Group: If the bandwidth of a service tunnel is insufficient, you can create an associated tunnel group and specify both an original tunnel and its split tunnels to carry services.

Configuring Bandwidth Information Flooding for MPLS TE: If the link bandwidth changes slightly, the threshold for flooding bandwidth information is set on the ingress or a transit node of a CR-LSP, which reduces flooding attempts and saves network resources.

Configuring the Limit Rate of MPLS TE Traffic: This section describes how to configure the limit rate of MPLS TE traffic to limit TE tunnel traffic within the bandwidth range that is actually configured.

Configuring Tunnel Re-optimization: Tunnel re-optimization is configured to allow a device to dynamically adjust paths for tunnels.

Configuring Isolated LSP Computation: To improve label switched path (LSP) reliability on a network that has the constraint-based routed label switched path (CR-LSP) hot standby feature, you can configure the isolated LSP computation feature so that the device uses both the disjoint algorithm and the constrained shortest path first (CSPF) algorithm to compute isolated primary and hot-standby LSPs.

Configuring Automatic Tunnel Bandwidth Adjustment: This section describes how to configure the automatic adjustment of the tunnel bandwidth.

Disabling Automatic Bandwidth Configuration for Physical Interfaces: You can disable automatic bandwidth configuration for physical interfaces during the network planning.

Disabling the Rerouting Function: The rerouting function enables MPLS TE to re-select another path for LSP reestablishment in the case that the original path fails. This section describes how to disable it.

Locking the Tunnel Configuration: Tunnel configurations can be locked by the controller when the configurations are sent to a NetEngine 8000 F.

Configuring P2MP TE Tunnels: A P2MP TE tunnel provides sufficient network bandwidth and high reliability for multicast service transmission on an IP/MPLS backbone network.

Configuring BFD for P2MP TE: BFD for P2MP TE rapidly monitors P2MP TE tunnels, which helps speed up responses to faults and improve network reliability.

Configuring P2MP TE FRR: P2MP TE fast reroute (FRR) provides local link protection for a P2MP TE tunnel. It establishes a bypass tunnel to protect sub-LSPs. If a link fails on the P2MP TE tunnel, traffic switches to the bypass tunnel within 50 milliseconds, which increases tunnel reliability.

Configuring P2MP TE Auto FRR: Auto fast reroute (FRR) is a local protection mechanism in MPLS TE. Auto FRR deployment is easier than manual FRR deployment.

Configuring DS-TE: This feature combines traditional TE tunnels with the DiffServ model to provide QoS guarantee based on service types.

Maintaining MPLS TE: This section describes how to delete MPLS TE information and debug MPLS TE.

Configuration Examples for MPLS TE: This section provides MPLS TE configuration examples.