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.
Usage Scenario
A static CR-LSP is easy to configure because its labels are manually assigned, and no signaling protocol is used to exchange control packets. The setup of a static CR-LSP consumes only a few resources, and you do not need to configure IGP TE or CSPF for the static CR-LSP. As a static CR-LSP cannot dynamically adapt to network changes.
The value of the outgoing label on each node is the value of the incoming label on its next hop.
The destination address of a static bidirectional co-routed LSP is the destination address specified on the tunnel interface.
Pre-configuration Tasks
Before configuring a static bidirectional co-routed LSP, complete the following tasks:
Configure unicast static routes or an IGP to implement connectivity between LSRs.
Configure an LSR ID for each LSR.
Enable MPLS globally and on interfaces on all LSRs.
- Enabling MPLS TE
- Before setting up a static bidirectional co-routed LSP, you must enable MPLS TE.
- (Optional) Configuring Link Bandwidth
- This section describes how to configure link bandwidth so that nodes can reserve the configured link bandwidth for a CR-LSP to be established.
- Configuring a Tunnel Interface on the Ingress
- A tunnel interface must be created before an MPLS TE tunnel is established on an ingress.
- (Optional) Configuring Global Dynamic BandwidthPre-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 a Static Bidirectional Co-routed LSP
- The ingress of a static bidirectional co-routed LSP needs to be manually specified.
- (Optional) Configuring a Transit Node of a Static Bidirectional Co-routed LSP
- The transit node of a static bidirectional co-routed LSP needs to be manually specified. This configuration is optional because a static bidirectional co-routed LSP may have no transit node.
- Configuring the Egress of a Static Bidirectional Co-routed CR-LSP
- The egress of a static bidirectional co-routed CR-LSP needs to be manually specified.
- Configuring the Tunnel Interface on the Egress
- The reverse tunnel attribute is configured, and the tunnel interface is bound to a static bidirectional co-routed LSP on the egress.
- Verifying the Configuration of a Static Bidirectional Co-routed LSP
- After configuring a static bidirectional co-routed LSP, you can view its status.