H3C Routers
MPLS OAM Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contents

Introduction· 1

Prerequisites· 1

Example: Configuring BFD for LSPs· 1

Network configuration· 1

Software versions used· 2

Procedures· 2

Verifying the configuration· 6

2.      Configuration files· 8

2.             Example: Configuring BFD for MPLS TE·· 11

1.      Network configuration· 11

2.      Software versions used· 12

3.      Restrictions and guidelines· 12

4.      Procedures· 12

5.      Verifying the configuration· 15

6.      Configuration files· 18

3.             Related documentation· 22

 

Introduction

The following information provides MPLS OAM configuration examples.

MPLS Operation, Administration, and Maintenance (OAM) provides fault management tools for the following purposes:

·     MPLS data plane connectivity verification.

·     Data plane and control plane consistency verification.

·     Fault locating.

MPLS OAM utilizes the fault management tools to detect and locate faults in LSPs, MPLS TE tunnels, and MPLS PWs, reducing the complexity of managing and maintaining MPLS networks and improving MPLS network availability.

Prerequisites

The following information applies to Comware 9-based routers. Procedures and information in the examples might be slightly different depending on the software or hardware version of the routers.

The configuration examples were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

The following information is provided based on the assumption that you have basic knowledge of MPLS OAM.

Example: Configuring BFD for LSPs

Network configuration

As shown in Figure 1, a company has two branches located in different places, interconnected through the MPLS backbone network of an operator. Real-time service synchronization is required between the two branches. The company requires the operator to provide HA services to ensure uninterrupted real-time business.

To meet the requirement, deploy LDP FRR in the MPLS backbone to provide two primary and backup LSP paths, and configure LDP and BFD collaboration for quick primary and backup switchover of the paths.

·     Under normal conditions, use the primary path to forward traffic between PE 1 and PE 2.

·     Use BFD to monitor the primary LSP. When the primary LSP fails, BFD can quickly sense and notify the LDP protocol, so traffic between PE 1 and PE 2 to quickly switch to the backup LSP for forwarding.

Figure 1 Network diagram

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Software versions used

This configuration example was created and verified on R9141P16 of the MSR5680-X3 device.

Procedures

Assign IP addresses to network interfaces:

# Assign an IP address to interface GigabitEthernet 1/0/1 on PE 1.

<PE1> system-view

[PE1] interface gigabitethernet 1/0/1

[PE1-GigabitEthernet1/0/1] ip address 12.12.12.1 24

[PE1-GigabitEthernet1/0/1] quit

# Assign IP addresses to other interfaces (including loopback interfaces) as shown in Figure 1 in the same way. (Details not shown.)

Configure OSPF on each router to ensure IP connectivity between them, and enable OSPF FRR.

# Configure PE 1.

[PE1] ospf

[PE1-ospf-1] area 0

[PE1-ospf-1-area-0.0.0.0] network 1.1.1.1 0.0.0.0

[PE1-ospf-1-area-0.0.0.0] network 12.12.12.0 0.0.0.255

[PE1-ospf-1-area-0.0.0.0] network 14.14.14.0 0.0.0.255

[PE1-ospf-1-area-0.0.0.0] network 192.168.10.0 0.0.0.255

[PE1-ospf-1-area-0.0.0.0] quit

[PE1-ospf-1] fast-reroute lfa

[PE1-ospf-1] quit

# Configure P 1.

[P1] ospf

[P1-ospf-1] area 0

[P1-ospf-1-area-0.0.0.0] network 2.2.2.2 0.0.0.0

[P1-ospf-1-area-0.0.0.0] network 12.12.12.0 0.0.0.255

[P1-ospf-1-area-0.0.0.0] network 23.23.23.0 0.0.0.255

[P1-ospf-1-area-0.0.0.0] quit

[P1-ospf-1] quit

# Configure PE 2.

[PE2] ospf

[PE2-ospf-1] area 0

[PE2-ospf-1-area-0.0.0.0] network 3.3.3.3 0.0.0.0

[PE2-ospf-1-area-0.0.0.0] network 23.23.23.0 0.0.0.255

[PE2-ospf-1-area-0.0.0.0] network 34.34.34.0 0.0.0.255

[PE2-ospf-1-area-0.0.0.0] network 192.168.20.0 0.0.0.255

[PE2-ospf-1-area-0.0.0.0] quit

[PE2-ospf-1] fast-reroute lfa

[PE2-ospf-1] quit

# Configure P 2.

[P2] ospf

[P2-ospf-1] area 0

[P2-ospf-1-area-0.0.0.0] network 4.4.4.4 0.0.0.0

[P2-ospf-1-area-0.0.0.0] network 14.14.14.0 0.0.0.255

[P2-ospf-1-area-0.0.0.0] network 34.34.34.0 0.0.0.255

[P2-ospf-1-area-0.0.0.0] quit

[P2-ospf-1] quit

# Adjust the OSPF cost values of GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 on P 2 to ensure the backup LSP has a bigger OSPF cost than the primary LSP.

[P2] interface gigabitethernet 1/0/1

[P2-GigabitEthernet1/0/1] ospf cost 10

[P2-GigabitEthernet1/0/1] quit

[P2] interface gigabitethernet 1/0/2

[P2-GigabitEthernet1/0/2] ospf cost 10

[P2-GigabitEthernet1/0/2] quit

Configure MPLS basic capability and enable LDP:

# Configure PE 1.

[PE1] mpls lsr-id 1.1.1.1

[PE1] mpls ldp

[PE1-ldp] quit

[PE1] interface gigabitethernet 1/0/1

[PE1-GigabitEthernet1/0/1] mpls enable

[PE1-GigabitEthernet1/0/1] mpls ldp enable

[PE1-GigabitEthernet1/0/1] quit

[PE1] interface gigabitethernet 1/0/2

[PE1-GigabitEthernet1/0/2] mpls enable

[PE1-GigabitEthernet1/0/2] mpls ldp enable

[PE1-GigabitEthernet1/0/2] quit

# Configure P 1.

[P1] mpls lsr-id 2.2.2.2

[P1] mpls ldp

[P1-ldp] quit

[P1] interface gigabitethernet 1/0/1

[P1-GigabitEthernet1/0/1] mpls enable

[P1-GigabitEthernet1/0/1] mpls ldp enable

[P1-GigabitEthernet1/0/1] quit

[P1] interface gigabitethernet 1/0/2

[P1-GigabitEthernet1/0/2] mpls enable

[P1-GigabitEthernet1/0/2] mpls ldp enable

[P1-GigabitEthernet1/0/2] quit

# Configure PE 2.

[PE2] mpls lsr-id 3.3.3.3

[PE2] mpls ldp

[PE2-ldp] quit

[PE2] interface gigabitethernet 1/0/1

[PE2-GigabitEthernet1/0/1] mpls enable

[PE2-GigabitEthernet1/0/1] mpls ldp enable

[PE2-GigabitEthernet1/0/1] quit

[PE2] interface gigabitethernet 1/0/2

[PE2-GigabitEthernet1/0/2] mpls enable

[PE2-GigabitEthernet1/0/2] mpls ldp enable

[PE2-GigabitEthernet1/0/2] quit

# Configure P 2.

[P2] mpls lsr-id 4.4.4.4

[P2] mpls ldp

[P2-ldp] quit

[P2] interface gigabitethernet 1/0/1

[P2-GigabitEthernet1/0/1] mpls enable

[P2-GigabitEthernet1/0/1] mpls ldp enable

[P2-GigabitEthernet1/0/1] quit

[P2] interface gigabitethernet 1/0/2

[P2-GigabitEthernet1/0/2] mpls enable

[P2-GigabitEthernet1/0/2] mpls ldp enable

[P2-GigabitEthernet1/0/2] quit

After the configuration is completed, verify that an LDP session in operational state has been established on each router. Take PE 1 as an example:

[PE1] display mpls ldp peer

Total number of peers: 2

Peer LDP ID             State         Role     GR   MD5  KA Sent/Rcvd

2.2.2.2:0               Operational   Passive  Off  Off  55/55

4.4.4.4:0               Operational   Passive  Off  Off  6/6

Configure an LSP generation policy to establish LSPs for routes destined for 192.168.10.0/24, 192.168.20.0/24, 1.1.1.1/32, and 3.3.3.3/32:

# On PE 1, configure IP prefix list PE1, and configure LDP to use only the routes permitted by the prefix list to establish LSPs.

[PE1] ip prefix-list PE1 index 10 permit 192.168.10.0 24

[PE1] ip prefix-list PE1 index 20 permit 192.168.20.0 24

[PE1] ip prefix-list PE1 index 30 permit 1.1.1.1 32

[PE1] ip prefix-list PE1 index 40 permit 3.3.3.3 32

[PE1] mpls ldp

[PE1-ldp] lsp-trigger prefix-list PE1

[PE1-ldp] quit

# On P 1, configure IP prefix list P1, and configure LDP to use only the routes permitted by the prefix list to establish LSPs.

[P1] ip prefix-list P1 index 10 permit 192.168.10.0 24

[P1] ip prefix-list P1 index 20 permit 192.168.20.0 24

[P1] ip prefix-list P1 index 30 permit 1.1.1.1 32

[P1] ip prefix-list P1 index 40 permit 3.3.3.3 32

[P1] mpls ldp

[P1-ldp] lsp-trigger prefix-list P1

[P1-ldp] quit

# On PE 2, configure IP prefix list PE 2, and configure LDP to use only the routes permitted by the prefix list to establish LSPs.

[PE2] ip prefix-list PE2 index 10 permit 192.168.10.0 24

[PE2] ip prefix-list PE2 index 20 permit 192.168.20.0 24

[PE2] ip prefix-list PE2 index 30 permit 1.1.1.1 32

[PE2] ip prefix-list PE2 index 40 permit 3.3.3.3 32

[PE2] mpls ldp

[PE2-ldp] lsp-trigger prefix-list PE2

[PE2-ldp] quit

# On P 2, configure IP prefix list P2, and configure LDP to use only the routes permitted by the prefix list to establish LSPs.

[P2] ip prefix-list P2 index 10 permit 192.168.10.0 24

[P2] ip prefix-list P2 index 20 permit 192.168.20.0 24

[P2] ip prefix-list P2 index 30 permit 1.1.1.1 32

[P2] ip prefix-list P2 index 40 permit 3.3.3.3 32

[P2] mpls ldp

[P2-ldp] lsp-trigger prefix-list P2

[P2-ldp] quit

# After the configuration is completed, execute the display mpls ldp lsp command on PE 1 to view LDP LSP information. The output shows that the LSP destined for subnet 192.168.20.0/24 has been established.

[PE1] display mpls ldp lsp

Status Flags: * - stale, L - liberal, B - backup

FECs: 4           Ingress: 4           Transit: 4           Egress: 2

 

FEC                In/Out Label        Nexthop         OutInterface

1.1.1.1/32         3/-

                   -/1151(L)

                   -/1149(L)

3.3.3.3/32         -/1150              12.12.12.2      GE1/0/1

                   1150/1150           12.12.12.2      GE1/0/1

                   -/1150(B)           14.14.14.4      GE1/0/2

                   1150/1150(B)        14.14.14.4      GE1/0/2

192.168.10.0/24    1148/-

                   -/1148(L)

                   -/1148(L)

192.168.20.0/24    -/1147              12.12.12.2      GE1/0/1

                   1147/1147           12.12.12.2      GE1/0/1

                   -/1147(B)           14.14.14.4      GE1/0/2

                   1147/1147(B)        14.14.14.4      GE1/0/2       

# Enable BFD for MPLS and configure BFD to detect the LSP connectivity.

# Configure PE 1.

[PE1] mpls bfd enable

[PE1] mpls bfd 3.3.3.3 32

# Configure PE 2.

[PE2] mpls bfd enable

[PE2] mpls bfd 1.1.1.1 32

Verifying the configuration

1.     After the configuration is completed, execute the display mpls bfd command on PE 1 and PE 2 to verify the BFD sessions established for LSPs. Use PE1 as an example.

[PE1] display mpls bfd

Total number of sessions: 2, 2 up, 0 down, 0 init

 

 FEC Type: LSP

 FEC Info:

   Destination: 1.1.1.1

   Mask Length: 32

 NHLFE ID: -

 Local Discr: 514                    Remote Discr: 513

 Source IP: 1.1.1.1                  Destination IP: 3.3.3.3

 Session State: Up                   Session Role: Active

 Template Name: -

 

 FEC Type: LSP

 FEC Info:

   Destination: 3.3.3.3

   Mask Length: 32

 NHLFE ID: 1028

 Local Discr: 513                    Remote Discr: 514

 Source IP: 1.1.1.1                  Destination IP: 127.0.0.1

 Session State: Up                   Session Role: Passive

 Template Name: -

Use the tracert mpls ipv4 command on PE 1 to verify that the primary LSP is currently used. (Before you use tracert on a device, you must enable sending of ICMP timeout packets on the intermediate devices and sending of ICMP destination unreachable packets on the destination device.)

<PE1> tracert mpls -a 192.168.10.1 ipv4 192.168.20.0 24

MPLS trace route FEC 192.168.20.0/24

  TTL   Replier            Time    Type      Downstream

  0                                Ingress   12.12.12.2/[1141]

  1     12.12.12.2         2 ms    Transit   23.23.23.3/[1141]

  2     23.23.23.3         2 ms    Egress

Ping PE 2 from PE 1 continuously, during which shut down interface GigabitEthernet 1/0/1 on P 1. Check whether the communication is interrupted:

# Ping PE 2 from PE 1 continuously.

<PE1> ping -c 100000 -a 192.168.10.1 192.168.20.1

Ping 192.168.20.1 (192.168.20.1) from 192.168.10.1: 56 data bytes, press CTRL_C

to break

56 bytes from 192.168.20.1: icmp_seq=0 ttl=254 time=2.576 ms

56 bytes from 192.168.20.1: icmp_seq=1 ttl=254 time=1.996 ms

...

# Shut down interface GigabitEthernet 1/0/1 on P 1.

[P1] interface gigabitethernet1/0/1

[P1-GigabitEthernet1/0/1] shutdown

# On PE 1, view the output of the ping command. The output shows that the communication was interrupted and then resumed quickly.

<PE1> ping -c 100000 -a 192.168.10.1 192.168.20.1

Ping 192.168.20.1 (192.168.20.1) from 192.168.10.1: 56 data bytes, press CTRL_C

to break

56 bytes from 192.168.20.1: icmp_seq=0 ttl=254 time=2.576 ms

56 bytes from 192.168.20.1: icmp_seq=1 ttl=254 time=1.996 ms

...

56 bytes from 192.168.20.1: icmp_seq=7 ttl=254 time=2.214 ms

Request time out

56 bytes from 192.168.20.1: icmp_seq=9 ttl=254 time=2.659 ms

56 bytes from 192.168.20.1: icmp_seq=10 ttl=254 time=5.049 ms

56 bytes from 192.168.20.1: icmp_seq=11 ttl=254 time=2.098 ms

56 bytes from 192.168.20.1: icmp_seq=12 ttl=254 time=2.225 ms

56 bytes from 192.168.20.1: icmp_seq=13 ttl=254 time=2.187 ms

 

--- Ping statistics for 192.168.20.1 ---

14 packet(s) transmitted, 13 packet(s) received, 7.1% packet loss

round-trip min/avg/max/std-dev = 1.990/2.455/5.049/0.772 ms

Check whether link switchover has occurred:

# Execute the tracert mpls ipv4 command on PE 1. The output shows that the backup LSP is currently used.

<PE1> tracert mpls -a 192.168.10.1 ipv4 192.168.20.0 24

MPLS trace route FEC 192.168.20.0/24

  TTL   Replier            Time    Type      Downstream

  0                                Ingress   14.14.14.4/[1133]

  1     14.14.14.4         2 ms    Transit   34.34.34.3/[1141]

  2     34.34.34.3         2 ms    Egress

2.     Configuration files

·     PE 1

#

ospf 1

 fast-reroute lfa

 area 0.0.0.0

  network 1.1.1.1 0.0.0.0

  network 12.12.12.0 0.0.0.255

  network 14.14.14.0 0.0.0.255

  network 192.168.10.0 0.0.0.255

#

 mpls lsr-id 1.1.1.1

#

mpls ldp

 lsp-trigger prefix-list PE1

#

 mpls bfd enable

#

interface LoopBack0

 ip address 1.1.1.1 255,255,255,255

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 12.12.12.1 255.255.255.0

 mpls enable

 mpls ldp enable

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 14.14.14.1 255.255.255.0

 mpls enable

 mpls ldp enable

#

interface GigabitEthernet1/0/3

 port link-mode route

 ip address 192.168.10.1 255.255.255.0

#

 ip prefix-list PE1 index 10 permit 192.168.10.0 24

 ip prefix-list PE1 index 20 permit 192.168.20.0 24

 ip prefix-list PE1 index 30 permit 1.1.1.1 32

 ip prefix-list PE1 index 40 permit 3.3.3.3 32

 

#

 mpls bfd 3.3.3.3 32

#

·     PE 2

#

ospf 1

 fast-reroute lfa

 area 0.0.0.0

  network 3.3.3.3 0.0.0.0

  network 23.23.23.0 0.0.0.255

  network 34.34.34.0 0.0.0.255

  network 192.168.20.0 0.0.0.255

#

 mpls lsr-id 3.3.3.3

#

mpls ldp

 lsp-trigger prefix-list PE2

#

 mpls bfd enable

#

interface LoopBack0

 ip address 3.3.3.3 255,255,255,255

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 34.34.34.3 255.255.255.0

 mpls enable

 mpls ldp enable

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 23.23.23.3 255.255.255.0

 mpls enable

 mpls ldp enable

#

interface GigabitEthernet1/0/3

 port link-mode route

 ip address 192.168.20.1 255.255.255.0

#

 ip prefix-list PE2 index 10 permit 192.168.10.0 24

 ip prefix-list PE2 index 20 permit 192.168.20.0 24

 ip prefix-list PE2 index 30 permit 1.1.1.1 32

 ip prefix-list PE2 index 40 permit 3.3.3.3 32

 

#

 mpls bfd 1.1.1.1 32

#

·     P 1

#

ospf 1

 area 0.0.0.0

  network 2.2.2.2 0.0.0.0

  network 12.12.12.0 0.0.0.255

  network 23.23.23.0 0.0.0.255

#

 mpls lsr-id 2.2.2.2

#

mpls ldp

 lsp-trigger prefix-list P1

#

interface LoopBack0

 ip address 2.2.2.2 255,255,255,255

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 12.12.12.2 255.255.255.0

 mpls enable

 mpls ldp enable

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 23.23.23.2 255.255.255.0

 mpls enable

 mpls ldp enable

#

 ip prefix-list P1 index 10 permit 192.168.10.0 24

 ip prefix-list P1 index 20 permit 192.168.20.0 24

 ip prefix-list P1 index 30 permit 1.1.1.1 32

 ip prefix-list P1 index 40 permit 3.3.3.3 32

 

#

·     P 2

#

ospf 1

 area 0.0.0.0

  network 4.4.4.4 0.0.0.0

  network 14.14.14.0 0.0.0.255

  network 34.34.34.0 0.0.0.255

#

 mpls lsr-id 4.4.4.4

#

mpls ldp

 lsp-trigger prefix-list P2

#

interface LoopBack0

 ip address 4.4.4.4 255,255,255,255

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 34.34.34.4 255.255.255.0

 ospf cost 10

 mpls enable

 mpls ldp enable

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 14.14.14.4 255.255.255.0

 ospf cost 10

 mpls enable

 mpls ldp enable

#

 ip prefix-list P2 index 10 permit 192.168.10.0 24

 ip prefix-list P2 index 20 permit 192.168.20.0 24

 ip prefix-list P2 index 30 permit 1.1.1.1 32

 ip prefix-list P2 index 40 permit 3.3.3.3 32

#

2.     Example: Configuring BFD for MPLS TE

1.     Network configuration

As shown in Figure 2, a company has two branches located in different places, interconnected through the MPLS TE tunnel over the network of the operator. Real-time service synchronization is required MPLS two branches. The company requires the operator to provide HA services to ensure uninterrupted real-time business.

To meet the requirement, deploy a primary and a backup CRLSP for the MPLS TE tunnel, and configure BFD for the MPLS TE tunnel for quick primary and backup switchover of the CRLSPs.

·     Under normal conditions, use the primary CRLSP (CRLSP 1) to forward traffic between Router A and Router C.

·     Use BFD to monitor the primary CRLSP. When the primary CRLSP fails, BFD can quickly sense and notify the RSVP protocol, so traffic between Router A and Router C to quickly switch to the backup CRLSP for forwarding.

Figure 2 Network diagram

 

2.     Software versions used

This configuration example was created and verified on R9141P16 of the MSR5680-X3 device

3.     Restrictions and guidelines

·     OSPF TE uses Type-10 opaque LSAs to carry the TE attributes for a link. Before you configure OSPF TE, you must enable opaque LSA advertisement and reception by using the opaque-capability enable command.

·     MPLS TE cannot reserve resources and distribute labels for an OSPF virtual link, and cannot establish a CRLSP through an OSPF virtual link. Make sure no virtual link exists in an OSPF area before you configure MPLS TE.

4.     Procedures

1.     Assign IP addresses to network interfaces:

# Assign an IP address to interface GigabitEthernet 1/0/1 on Router A.

<RouterA> system-view

[RouterA] interface gigabitethernet 1/0/1

[RouterA-GigabitEthernet1/0/1] ip address 12.12.12.1 24

[RouterA-GigabitEthernet1/0/1] quit

# Assign IP addresses to other interfaces (including loopback interfaces) as shown in Figure 2 in the same way. (Details not shown.)

2.     Configure the LSR ID, enable MPLS, MPLS TE, and RSVP-TE on each router:

# Configure Router A.

[RouterA] mpls lsr-id 1.1.1.1

[RouterA] mpls te

[RouterA-te] quit

[RouterA] rsvp

[RouterA-rsvp] quit

[RouterA] interface gigabitethernet 1/0/1

[RouterA-GigabitEthernet1/0/1] mpls enable

[RouterA-GigabitEthernet1/0/1] mpls te enable

[RouterA-GigabitEthernet1/0/1] rsvp enable

[RouterA-GigabitEthernet1/0/1] quit

[RouterA] interface gigabitethernet 1/0/2

[RouterA-GigabitEthernet1/0/2] mpls enable

[RouterA-GigabitEthernet1/0/2] mpls te enable

[RouterA-GigabitEthernet1/0/2] rsvp enable

[RouterA-GigabitEthernet1/0/2] quit

Configure Router B, Router C, and Router D is the same way that Router A is configured. For more information, see the configuration files.

3.     Configure OSPF on each router to ensure IP connectivity between them, enable opaque LSA advertisement and reception for OSPF, and enable MPLS TE in OSPF area 0.

# Configure Router A.

[RouterA] ospf

[RouterA-ospf-1] opaque-capability enable

[RouterA-ospf-1] area 0

[RouterA-ospf-1-area-0.0.0.0] mpls te enable

[RouterA-ospf-1-area-0.0.0.0] network 1.1.1.1 0.0.0.0

[RouterA-ospf-1-area-0.0.0.0] network 12.12.12.0 0.0.0.255

[RouterA-ospf-1-area-0.0.0.0] network 14.14.14.0 0.0.0.255

[RouterA-ospf-1-area-0.0.0.0] network 192.168.10.0 0.0.0.255

[RouterA-ospf-1-area-0.0.0.0] quit

[RouterA-ospf-1] quit

# Configure Router B.

[RouterB] ospf

[RouterB-ospf-1] opaque-capability enable

[RouterB-ospf-1] area 0

[RouterB-ospf-1-area-0.0.0.0] mpls te enable

[RouterB-ospf-1-area-0.0.0.0] network 2.2.2.2 0.0.0.0

[RouterB-ospf-1-area-0.0.0.0] network 12.12.12.0 0.0.0.255

[RouterB-ospf-1-area-0.0.0.0] network 23.23.23.0 0.0.0.255

[RouterB-ospf-1-area-0.0.0.0] quit

[RouterB-ospf-1] quit

# Configure Router C.

[RouterC] ospf

[RouterC-ospf-1] opaque-capability enable

[RouterC ospf-1] area 0

[RouterC-ospf-1-area-0.0.0.0] mpls te enable

[RouterC-ospf-1-area-0.0.0.0] network 3.3.3.3 0.0.0.0

[RouterC ospf-1-area-0.0.0.0] network 23.23.23.0 0.0.0.255

[RouterC ospf-1-area-0.0.0.0] network 34.34.34..0 0.0.0.255

[RouterC ospf-1-area-0.0.0.0] network 192.168.20.0 0.0.0.255

[RouterC ospf-1-area-0.0.0.0] quit

[RouterC ospf-1] quit

Configure Router D.

[RouterD] ospf

[RouterD-ospf-1] opaque-capability enable

[RouterD-ospf-1] area 0

[RouterC-ospf-1-area-0.0.0.0] mpls te enable

[RouterD-ospf-1-area-0.0.0.0] network 4.4.4.4 0.0.0.0

[RouterD-ospf-1-area-0.0.0.0] network 14.14.14.0 0.0.0.255

[RouterD-ospf-1-area-0.0.0.0] network 34.34.34.0 0.0.0.255

[RouterD-ospf-1-area-0.0.0.0] quit

[RouterD-ospf-1] quit

4.     Configure the MPLS tunnel:

# On Router A, configure MPLS TE tunnel interface Tunnel 3. Specify the tunnel destination address as the LSR ID of Router including C (3.3.3.3), use RSVP-TE as the MPLS TE tunnel signaling protocol, and enable CRLSP hot backup for the tunnel.

[RouterA] interface tunnel 3 mode mpls-te

[RouterA-Tunnel3] ip address 9.1.1.1 255.255.255.0

[RouterA-Tunnel3] destination 3.3.3.3

[RouterA-Tunnel3] mpls te signaling rsvp-te

[RouterA-Tunnel3] mpls te backup hot-standby

[RouterA-Tunnel3] quit

# Configure explicit paths cr-lsp1 and cr-lsp2 for the tunnel. Set the preference of path cr-lsp1 to 1 and that of path cr-lsp2 to 2, so the tunnel uses CRLSP 1 as the primary CRLSP and CRLSP 2 as the backup CRLSP.

[RouterA] explicit-path cr-lsp1

[RouterA-explicit-path-cr-lsp1] nexthop 12.12.12.2

[RouterA-explicit-path-cr-lsp1] quit

[RouterA] explicit-path cr-lsp2

[RouterA-explicit-path-cr-lsp2] nexthop 14.14.14.4

[RouterA-explicit-path-cr-lsp2] quit

[RouterA] interface tunnel 3

[RouterA-Tunnel3] mpls te path preference 1 explicit-path cr-lsp1

[RouterA-Tunnel3] mpls te path preference 2 explicit-path cr-lsp2

[RouterA-Tunnel3] quit

# On Router C, configure MPLS TE tunnel interface Tunnel 3. Specify the tunnel destination address as the LSR ID of Router A (1.1.1.1), use RSVP-TE as the MPLS TE tunnel signaling protocol, and enable CRLSP hot backup for the tunnel.

[RouterC] interface tunnel 3 mode mpls-te

[RouterC-Tunnel3] ip address 9.3.3.3 255.255.255.0

[RouterC-Tunnel3] destination 1.1.1.1

[RouterC-Tunnel3] mpls te signaling rsvp-te

[RouterC-Tunnel3] mpls te backup hot-standby

[RouterC-Tunnel3] quit

# Configure explicit paths cr-lsp1 and cr-lsp2 for the tunnel. Set the preference of path cr-lsp1 to 1 and that of path cr-lsp2 to 2, so the tunnel uses CRLSP 1 as the primary CRLSP and CRLSP 2 as the backup CRLSP.

[RouterC] explicit-path cr-lsp1

[RouterC-explicit-path-cr-lsp1] nexthop 23.23.23.2

[RouterC-explicit-path-cr-lsp1] quit

[RouterC] explicit-path cr-lsp2

[RouterC-explicit-path-cr-lsp2] nexthop 34.34.34.4

[RouterC-explicit-path-cr-lsp2] quit

[RouterC] interface tunnel 3

[RouterC-Tunnel3] mpls te path preference 1 explicit-path cr-lsp1

[RouterC-Tunnel3] mpls te path preference 2 explicit-path cr-lsp2

[RouterC-Tunnel3] quit

5.     Configure a static route to direct traffic to the MPLS TE tunnel:

# Configure a static route on Router A to direct the traffic destined for 192.168. 20.0/24 to MPLS TE tunnel interface Tunnel 3.

[RouterA] ip route-static 192.168.20.0 24 tunnel 3 preference 1

# Configure a static route on Router C to direct the traffic destined for 192.168.10.0/24 to MPLS TE tunnel interface Tunnel 3.

[RouterC] ip route-static 192.168.10.0 24 tunnel 3 preference 1

6.     Enable BFD for MPLS and configure BFD to detect the TE tunnel connectivity.

# Configure Router A.

[RouterA] mpls bfd enable

[RouterA] interface tunnel 3

[RouterA-Tunnel3] mpls bfd

[RouterA-Tunnel3] quit

# Configure Router C.

[RouterC] mpls bfd enable

[RouterC] interface tunnel 3

[RouterC-Tunnel3] mpls bfd

[RouterC-Tunnel3] quit

5.     Verifying the configuration

1.     After the configuration is completed, verify whether the MPLS TE tunnel is established successfully.

# Execute the display interface tunnel command on Router A and Router C. The output shows that Tunnel 3 has come up. Take Router A as an example:

<RouterA> display interface tunnel

Tunnel3

Current state: Up

Line protocol state: Up

Description: Tunnel3 Interface

Bandwidth: 64kbps

Maximum Transmit Unit: 1496

Internet Address is 9.1.1.1/24 Primary

Tunnel source unknown, destination 3.3.3.3

Tunnel TTL 255

Tunnel protocol/transport CR_LSP

Last clearing of counters: Never

Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Input: 0 packets, 0 bytes, 0 drops

Output: 0 packets, 0 bytes, 0 drops

2.     Execute the tracert mpls te command on Router A to verify that CRLSP 1 is currently used. (Before you use tracert on a device, you must enable sending of ICMP timeout packets on the intermediate devices and sending of ICMP destination unreachable packets on the destination device.)

<RouterA> tracert mpls te Tunnel 3

MPLS trace route TE tunnel Tunnel3

  TTL   Replier            Time    Type      Downstream

  0                                Ingress   12.12.12.2/[1140]

  1     12.12.12.2         30 ms   Transit   23.23.23.3/[3]

  2     23.23.23.3         2 ms    Egress

3.     Use the display mpls bfd command to view information about the BFD sessions for the primary CRLSP and backup CRLSP of the MPLS TE tunnel. Take Router A as an example:

<RouterA> display mpls bfd te tunnel 3

 Total number of sessions: 2, 2 up, 0 down, 0 init

 

 FEC Type: TE Tunnel

 FEC Info:

   Send Addr: 1.1.1.1

   End  Addr: 3.3.3.3

   Tunnel ID: 3

   LSP ID   : 6681

 NHLFE ID: 1037

 Local Discr: 513                    Remote Discr: 513

 Source IP: 1.1.1.1                  Destination IP: 127.0.0.1

 Session State: Up                   Session Role: Passive

 Template Name: -

 

 FEC Type: TE Tunnel

 FEC Info:

   Send Addr: 1.1.1.1

   End  Addr: 3.3.3.3

   Tunnel ID: 3

   LSP ID   : 6682

 NHLFE ID: 1039

 Local Discr: 514                    Remote Discr: 514

 Source IP: 1.1.1.1                  Destination IP: 127.0.0.2

 Session State: Up                   Session Role: Passive

 Template Name: -

4.     Ping Router C from Router A continuously, during which shut down interface GigabitEthernet 1/0/1 on Router B. Check whether the communication is interrupted:

Ping Router C from Router A continuously.

<RouterA> ping -c 10000 -a 192.168.10.1 192.168.20.1

Ping 192.168.20.1 (192.168.20.1) from 192.168.10.1: 56 data bytes, press CTRL_C

to break

56 bytes from 192.168.20.1: icmp_seq=0 ttl=254 time=3.443 ms

56 bytes from 192.168.20.1: icmp_seq=1 ttl=254 time=2.835 ms

...

# Shut down interface GigabitEthernet 1/0/1 on Router B.

[RouterB] interface gigabitethernet1/0/1

[RouterB-GigabitEthernet1/0/1] shutdown

# On Router A, view the output of the ping command. The output shows that the communication was interrupted and then resumed quickly.

<RouterA> ping -c 10000 -a 192.168.10.1 192.168.20.1

Ping 192.168.20.1 (192.168.20.1) from 192.168.10.1: 56 data bytes, press CTRL_C

to break

56 bytes from 192.168.20.1: icmp_seq=0 ttl=254 time=3.443 ms

56 bytes from 192.168.20.1: icmp_seq=1 ttl=254 time=2.835 ms

...

56 bytes from 192.168.20.1: icmp_seq=22 ttl=254 time=3.503 ms

Request time out

56 bytes from 192.168.20.1: icmp_seq=24 ttl=254 time=2.434 ms

56 bytes from 192.168.20.1: icmp_seq=25 ttl=254 time=3.196 ms

56 bytes from 192.168.20.1: icmp_seq=26 ttl=254 time=3.592 ms

56 bytes from 192.168.20.1: icmp_seq=27 ttl=254 time=2.305 ms

56 bytes from 192.168.20.1: icmp_seq=28 ttl=254 time=2.139 ms

 

--- Ping statistics for 192.168.20.1 ---

29 packet(s) transmitted, 28 packet(s) received, 3.4% packet loss

round-trip min/avg/max/std-dev = 2.076/2.701/3.921/0.609 ms

5.     Check whether link switchover has occurred:

# Execute the tracert mpls te command on Router A to verify that CRLSP 2 is currently used.

<RouterA> tracert mpls te Tunnel 3

MPLS trace route TE tunnel Tunnel3

  TTL   Replier            Time    Type      Downstream

  0                                Ingress   14.14.14.4/[1142]

  1     14.14.14.4         198 ms  Transit   34.34.34.3/[3]

  2     34.34.34.3         7 ms    Egress

# Execute the display mpls bfd command. You can see the BFD session for CRLSP 2 of the MPLS TE tunnel. Take Router A as an example:

<RouterA> display mpls bfd te tunnel 3

 Total number of sessions: 1, 1 up, 0 down, 0 init

 

 FEC Type: TE Tunnel

 FEC Info:

   Send Addr: 1.1.1.1

   End  Addr: 3.3.3.3

   Tunnel ID: 3

   LSP ID   : 6682

 NHLFE ID: 1039

 Local Discr: 514                    Remote Discr: 514

 Source IP: 1.1.1.1                  Destination IP: 127.0.0.2

 Session State: Up                   Session Role: Passive

 Template Name: -

6.     Configuration files

·     Router A:

#

ospf 1

 area 0.0.0.0

  network 1.1.1.1 0.0.0.0

  network 12.12.12.0 0.0.0.255

  network 14.14.14.0 0.0.0.255

  network 192.168.10.0 0.0.0.255

  mpls te enable

#

 mpls lsr-id 1.1.1.1

#

mpls te

#

explicit-path cr-lsp1

 nexthop index 1 12.12.12.2 include strict

#

explicit-path cr-lsp2

 nexthop index 1 14.14.14.4 include strict

#

rsvp

#

 mpls bfd enable

#

interface LoopBack0

 ip address 1.1.1.1 255,255,255,255

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 12.12.12.1 255.255.255.0

 mpls enable

 mpls te enable

 rsvp enable

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 14.14.14.1 255.255.255.0

 mpls enable

 mpls te enable

 rsvp enable

#

interface GigabitEthernet1/0/3

 port link-mode route

 ip address 192.168.10.1 255.255.255.0

#

interface Tunnel3 mode mpls-te

 ip address 9.1.1.1 255.255.255.0

 mpls te path preference 1 explicit-path cr-lsp1

 mpls te path preference 2 explicit-path cr-lsp2

 mpls te backup hot-standby

 mpls bfd

 destination 3.3.3.3

#

 ip route-static 192.168.20.0 24 Tunnel3 preference 1

#

·     Router B:

#

ospf 1

 area 0.0.0.0

  network 2.2.2.2 0.0.0.0

  network 12.12.12.0 0.0.0.255

  network 23.23.23.0 0.0.0.255

  mpls te enable

#

 mpls lsr-id 2.2.2.2

#

mpls te

#

rsvp

#

interface LoopBack0

 ip address 2.2.2.2 255,255,255,255

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 12.12.12.2 255.255.255.0

 mpls enable

 mpls te enable

 rsvp enable

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 23.23.23.2 255.255.255.0

 mpls enable

 mpls te enable

 rsvp enable

#

·     Router C:

#

ospf 1

 area 0.0.0.0

  network 3.3.3.3 0.0.0.0

  network 23.23.23.0 0.0.0.255

  network 34.34.34.0 0.0.0.255

  network 192.168.20.0 0.0.0.255

  mpls te enable

#

 mpls lsr-id 3.3.3.3

#

mpls te

#

explicit-path cr-lsp1

 nexthop index 1 23.23.23.2 include strict

#

explicit-path cr-lsp2

 nexthop index 1 34.34.34.4 include strict

#

rsvp

#

 mpls bfd enable

#

interface LoopBack0

 ip address 3.3.3.3 255,255,255,255

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 34.34.34.3 255.255.255.0

 mpls enable

 mpls te enable

 rsvp enable

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 23.23.23.3 255.255.255.0

 mpls enable

 mpls te enable

 rsvp enable

#

interface GigabitEthernet1/0/3

 port link-mode route

 ip address 192.168.20.1 255.255.255.0

#

interface Tunnel3 mode mpls-te

 ip address 9.3.3.3 255.255.255.0

 mpls te path preference 1 explicit-path cr-lsp1

 mpls te path preference 2 explicit-path cr-lsp2

 mpls te backup hot-standby

 mpls bfd

 destination 1.1.1.1

#

 ip route-static 192.168.10.0 24 Tunnel3 preference 1

#

·     Router D:

#

ospf 1

 area 0.0.0.0

  network 4.4.4.4 0.0.0.0

  network 14.14.14.0 0.0.0.255

  network 34.34.34.0 0.0.0.255

  mpls te enable

#

 mpls lsr-id 4.4.4.4

#

mpls te

#

rsvp

#

interface LoopBack0

 ip address 4.4.4.4 255,255,255,255

#

interface GigabitEthernet1/0/1

 port link-mode route

 ip address 34.34.34.4 255.255.255.0

 mpls enable

 mpls te enable

 rsvp enable

#

interface GigabitEthernet1/0/2

 port link-mode route

 ip address 14.14.14.4 255.255.255.0

 mpls enable

 mpls te enable

 rsvp enable

#

3.     Related documentation

·     MPLS Configuration Guide in H3C MSR5680-X3 Router Configuration Guides (V9)

·     MPLS Command Reference in H3C MSR5680-X3 Router Command References (V9)