Example for Configuring an Associated Bidirectional Static CR-LSP

This section provides an example for configuring an associated bidirectional static CR-LSP.

Networking Requirements

In Figure 1, a forward static CR-LSP is established along the path PE1 -> PE2, and a reverse static CR-LSP is established along the path PE2 -> PE1. To allow a traffic switchover to be performed on both CR-LSPs, bind the two static CR-LSPs to each other to form an associated bidirectional static CR-LSP.

Figure 1 Associated bidirectional static CR-LSP

Interfaces 1 and 2 in this example represent GE 0/1/0 and GE 0/1/8, respectively.

Configuration Roadmap

The configuration roadmap is as follows:

Assign an IP address to every interface and configure a loopback interface address as an LSR ID on every node.
Configure a forward static CR-LSP and a reverse static CR-LSP.
Bind the forward and reverse static CR-LSPs to each other.

Data Preparation

To complete the configuration, you need the following data:

In this example, a forward static CR-LSP is established along the path PE1 -> PE2, and a reverse static CR-LSP is established along the path PE2 -> PE1.

**Table 1** Data to be prepared
Device Name	Parameter	Value
PE1	Number of a tunnel interface on the forward CR-LSP	Tunnel10
	Tunnel ID of the forward CR-LSP	100
	Outgoing label of the forward CR-LSP	20
	Name of the reverse CR-LSP	Tunnel20
	Incoming label of the reverse CR-LSP	130
P	Name of the forward CR-LSP	Tunnel10
	Incoming label of the forward CR-LSP	20
	Outgoing label of the forward CR-LSP	30
	Name of the reverse CR-LSP	Tunnel20
	Incoming label of the reverse CR-LSP	120
	Outgoing label of the reverse CR-LSP	130
PE2	Number of a tunnel interface on the reverse CR-LSP	Tunnel20
	Tunnel ID of the reverse CR-LSP	200
	Outgoing label of the reverse CR-LSP	120
	Name of the forward CR-LSP	Tunnel10
	Incoming label of the forward CR-LSP	30

Procedure

Assign an IP address and a mask to each interface.
Assign IP addresses and masks to interfaces. For configuration details, see Configuration Files in this section.
Configure a forward static CR-LSP and a reverse static CR-LSP.
For configuration details, see Configuration Files in this section.

Bind the forward and reverse static CR-LSPs to each other.

# Configure PE1.

[~PE1] interface Tunnel 10
[~PE1-Tunnel10] mpls te reverse-lsp protocol static lsp-name Tunnel20
[*PE1-Tunnel10] commit

# Configure PE2.

[~PE2] interface Tunnel 20
[~PE2-Tunnel20] mpls te reverse-lsp protocol static lsp-name Tunnel10
[*PE2-Tunnel20] commit

Verify the configuration.

After completing the preceding configurations, run the display mpls te reverse-lsp verbose command on PE1 and PE2 to view reserve static CR-LSP information. The following example uses the command output on PE1.

[~PE1] display mpls te reverse-lsp verbose
-------------------------------------------------------------------------------
                 LSP Information: STATIC LSP
-------------------------------------------------------------------------------
  Obverse Tunnel           :  Tunnel10      //Tunnel interface on the forward CR-LSP
  Reverse LSP Name         :  Tunnel20      //Name of the reverse CR-LSP
  Reverse LSP State        :  Up               //Status of the reverse CR-LSP
  Incoming Label           :  130
  Incoming Interface       :  GE0/1/0

Configuration Files

PE1 configuration file

#
sysname PE1
#
mpls lsr-id 1.1.1.1
#
mpls
 mpls te
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 10.1.1.1 255.255.255.252
 mpls
 mpls te
#
interface LoopBack1
 ip address 1.1.1.1 255.255.255.255
#
interface Tunnel10
 ip address unnumbered interface LoopBack1
 tunnel-protocol mpls te
 destination 3.3.3.3
 mpls te signal-protocol cr-static
 mpls te reverse-lsp protocol static lsp-name Tunnel20
 mpls te tunnel-id 100
#
static-cr-lsp ingress tunnel-interface Tunnel10 destination 3.3.3.3 nexthop 10.1.1.2 out-label 20
#
static-cr-lsp egress Tunnel20 incoming-interface GigabitEthernet0/1/0 in-label 130
#
return

P configuration file

#
sysname P
#
mpls lsr-id 2.2.2.2
#
mpls
 mpls te
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 10.1.1.2 255.255.255.252
 mpls
 mpls te
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 10.2.1.1 255.255.255.252
 mpls
 mpls te
#
interface LoopBack1
 ip address 2.2.2.2 255.255.255.255
#               
static-cr-lsp transit Tunnel10 incoming-interface GigabitEthernet0/1/0 in-label 20 nexthop 10.2.1.2 out-label 30
#
static-cr-lsp transit Tunnel20 incoming-interface GigabitEthernet0/1/8 in-label 120 nexthop 10.1.1.1 out-label 130
#
return

PE2 configuration file

#
sysname PE2
#
mpls lsr-id 3.3.3.3
#
mpls
 mpls te
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 10.2.1.2 255.255.255.252
 mpls
 mpls te
#
interface LoopBack1
 ip address 3.3.3.3 255.255.255.255
#
interface Tunnel20
 ip address unnumbered interface LoopBack1
 tunnel-protocol mpls te
 destination 1.1.1.1
 mpls te signal-protocol cr-static
 mpls te reverse-lsp protocol static lsp-name Tunnel10
 mpls te tunnel-id 200
#
static-cr-lsp ingress tunnel-interface Tunnel20 destination 1.1.1.1 nexthop 10.2.1.1 out-label 120
#
static-cr-lsp egress Tunnel10 incoming-interface GigabitEthernet0/1/8 in-label 30
#
return