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.

Usage Scenario

The configuration of a static CR-LSP is a simple process. Labels are manually allocated, and no signaling protocol or exchange of control packets is needed. The setup of a static CR-LSP consumes a few resources. In addition, neither IGP TE nor CSPF needs to be configured for the static CR-LSP.

The static CR-LSP cannot dynamically adapt to a changing network. Therefore, its application is very limited.

The static CR-LSP configurations involve the operations on the following types of nodes:

Ingress: An LSP forwarding entry is configured, and an LSP configured on the ingress is bound to the TE tunnel interface.
Transit node: An LSP forwarding entry is configured.
Egress: An LSP forwarding entry is configured.

Pre-configuration Tasks

Before configuring a static CR-LSP, complete the following tasks:

Configure the static route or IGP to implement the reachability between LSRs.
Configure an LSR ID on each LSR.
Enable basic MPLS functions on each LSR globally and on each interface.

Enabling MPLS TE: Before you set up a static CR-LSP, enable MPLS TE.

(Optional) Configuring Link Bandwidth: By configuring the link bandwidth, you can constrain the bandwidth of a CR-LSP.

Configuring the MPLS TE Tunnel Interface: This section describes how to configure the MPLS TE tunnel interface. You must create a tunnel interface before setting up an MPLS TE tunnel.

(Optional) Configuring Global Dynamic Bandwidth Pre-Verification: Global dynamic bandwidth pre-verification enables a device to check dynamic bandwidth usage before a static CR-LSP, or a static bidirectional co-routed LSP is established.

Configuring the Ingress of the Static CR-LSP: This section describes how to configure the ingress of a static CR-LSP. Before you establish a static CR-LSP, specify the ingress of the CR-LSP.

(Optional) Configuring the Transit Node of the Static CR-LSP: This section describes how to configure the transit nodes of a static CR-LSP. Before you set up a static CR-LSP, specify the transit nodes of the CR-LSP. This procedure is optional because the CR-LSP may have no transit node.

Configuring the Egress of the Static CR-LSP: This section describes how to configure the egress of a static CR-LSP. Before you set up a static CR-LSP, specify the egress of the CR-LSP.

(Optional) Configuring a Device to Check the Inbound Interface of a Static CR-LSP: A device uses the static CR-LSP's source interface check function to check whether the inbound interface of labeled packets is the same as that of a configured static CR-LSP. If the inbound interfaces match, the device forwards the packets. If the inbound interfaces do not match, the device discards the packets.

Verifying the Static CR-LSP Configuration: After the configuration of a static CR-LSP, you can view the static CR-LSP status.