The configuration examples in this document 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.

This document assumes that you have basic knowledge of MPLS OAM.

Example: Configuring BFD for an LSP

Network configuration

As shown in Figure 1, a company has two branches that are connected to the MPLS backbone. It requires the MPLS backbone to establish LSPs for communication between the branches, and to provide high availability services for uninterrupted business between the branches.

To meet the requirements:

· Establish LSPs by using LDP.

· Configure OSPF FRR on the MPLS backbone so LDP can establish a primary LSP and a backup LSP.

· Configure BFD for the primary LSP. When the primary LSP fails, BFD can quickly detect the failure and notify LDP of the failure, so LDP can immediately switch traffic to the backup LSP.

Figure 1 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Not supported
S6525XE-HI switch series	Not supported
S5850 switch series	Not supported
S5560X-EI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
ES5500 switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F switch MS4520V2-30C switch MS4520V2-54C switch	Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx

Restrictions and guidelines

Before configuration, disable the spanning tree feature globally or map each VLAN to an MSTI.

Procedures

1. Configure IP addresses for interfaces:

# On PE 1, configure IP addresses and masks for interfaces, including the loopback interface, as shown in Figure 1.

<PE1> system-view

[PE1] vlan 10

[PE1-vlan10] port gigabitethernet 1/0/3

[PE1-vlan10] quit

[PE1] interface vlan-interface 10

[PE1-Vlan-interface10] ip address 192.168.10.1 24

[PE1] vlan 12

[PE1-vlan12] port gigabitethernet 1/0/1

[PE1-vlan12] quit

[PE1] interface vlan-interface 12

[PE1-Vlan-interface12] ip address 12.12.12.1 24

[PE1-Vlan-interface12] quit

[PE1] vlan 14

[PE1-vlan14] port gigabitethernet 1/0/2

[PE1-vlan14] quit

[PE1] interface vlan-interface 14

[PE1-Vlan-interface14] ip address 14.14.14.1 24

[PE1-Vlan-interface14] quit

[PE1] interface loopback 0

[PE1-LoopBack0] ip address 1.1.1.1 32

[PE1-LoopBack0] quit

# Configure other devices in the same way that PE 1 is configured. (Details not shown.)

2. Configure OSPF to ensure IP connectivity within the MPLS backbone, 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

# On P 2, set the OSPF cost to 10 for VLAN-interface 14 and VLAN-interface 34. This setting ensures that the backup LSP has a larger OSPF cost than the primary LSP.

[P2] interface vlan-interface 14

[P2-Vlan-interface14] ospf cost 10

[P2-Vlan-interface14] quit

[P2] interface vlan-interface 34

[P2-Vlan-interface34] ospf cost 10

[P2-Vlan-interface34] quit

3. Configure basic MPLS and MPLS LDP:

# Configure PE 1.

[PE1] mpls lsr-id 1.1.1.1

[PE1] mpls ldp

[PE1-ldp] quit

[PE1] interface vlan-interface 12

[PE1-Vlan-interface12] mpls enable

[PE1-Vlan-interface12] mpls ldp enable

[PE1-Vlan-interface12] quit

[PE1] interface vlan-interface 14

[PE1-Vlan-interface14] mpls enable

[PE1-Vlan-interface14] mpls ldp enable

[PE1-Vlan-interface14] quit

# Configure P 1.

[P1] mpls lsr-id 2.2.2.2

[P1] mpls ldp

[P1-ldp] quit

[P1] interface vlan-interface 12

[P1-Vlan-interface12] mpls enable

[P1-Vlan-interface12] mpls ldp enable

[P1-Vlan-interface12] quit

[P1] interface vlan-interface 23

[P1-Vlan-interface23] mpls enable

[P1-Vlan-interface23] mpls ldp enable

[P1-Vlan-interface23] quit

# Configure PE 2.

[PE2] mpls lsr-id 3.3.3.3

[PE2] mpls ldp

[PE2-ldp] quit

[PE2] interface vlan-interface 23

[PE2-Vlan-interface23] mpls enable

[PE2-Vlan-interface23] mpls ldp enable

[PE2-Vlan-interface23] quit

[PE2] interface vlan-interface 34

[PE2-Vlan-interface34] mpls enable

[PE2-Vlan-interface34] mpls ldp enable

[PE2-Vlan-interface34] quit

# Configure P 2.

[P2] mpls lsr-id 4.4.4.4

[P2] mpls ldp

[P2-ldp] quit

[P2] interface vlan-interface 14

[P2-Vlan-interface14] mpls enable

[P2-Vlan-interface14] mpls ldp enable

[P2-Vlan-interface14] quit

[P2] interface vlan-interface 34

[P2-Vlan-interface34] mpls enable

[P2-Vlan-interface34] mpls ldp enable

[P2-Vlan-interface34] quit

# Verify that LDP sessions in Operational state have been established on each device. The following shows the output on PE 1.

[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

4. Configure LSP generation policies to establish LSPs to destinations 192.168.10.0/24, 192.168.20.0/24, 1.1.1.1/32, and 3.3.3.3/32:

# On PE 1, create 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, create 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, create IP prefix list PE2, 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, create 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

# Verify that LSPs to destination 192.168.20.0/24 have been established on PE 1. The primary LSP uses VLAN-interface 12 as the outgoing interface and the backup LSP uses VLAN-interface 14 as the outgoing interface.

[PE1]display mpls ldp lsp

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

Statistics:

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

FEC In/Out Label Nexthop OutInterface

1.1.1.1/32 3/-

-/1151(L)

-/1279(L)

3.3.3.3/32 -/1150 12.12.12.2 Vlan12

1150/1150 12.12.12.2 Vlan12

-/1150(B) 12.12.12.2 Vlan14

1150/1150(B) 12.12.12.2 Vlan14

192.168.10.0/24 1141/-

-/1141(L)

192.168.20.0/24 -/1133 12.12.12.2 Vlan12

1133/1133 12.12.12.2 Vlan12

-/1133(B) 14.14.14.4 Vlan14

1133/1133(B) 14.14.14.4 Vlan14

5. Enable BFD for MPLS and use BFD to verify 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. Display BFD information for LSPs on PE 1 and PE 2. The following shows the output on PE 1.

[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: 1026 Remote Discr: 514

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: 1025 Remote Discr: -

Source IP: 1.1.1.1 Destination IP: 127.0.0.1

Session State: Up Session Role: Passive

Template Name: -

2. Execute the tracert mpls ipv4 command on PE 1. The output shows that the primary LSP is in use.

NOTE:

Before you use the tracert feature, enable sending ICMP time exceeded messages on intermediate devices, and enable sending ICMP destination unreachable messages 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/[1148]

1 12.12.12.2 2 ms Transit 23.23.23.3/[1148]

2 23.23.23.3 2 ms Egress

3. Verify that the ping operation from PE 1 to PE 2 will not fail after VLAN-interface 23 on P 1 is shut down during the ping operation:

# Ping PE 2 from PE 1.

[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 VLAN-interface 23 on P 1.

[P1] interface vlan-interface 23

[P1-Vlan-interface23] shutdown

# View the ping command output. The output shows that the communication was interrupted, and then immediately resumed.

[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

4. Execute the tracert mpls ipv4 command on PE 1. The output shows that the backup LSP is in use.

[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/[1276]

1 14.14.14.4 2 ms Transit 34.34.34.3/[1148]

2 34.34.34.3 2 ms Egress

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

vlan 10

vlan 12

vlan 14

mpls ldp

lsp-trigger prefix-list PE1

mpls bfd enable

interface LoopBack0

ip address 1.1.1.1 255.255.255.255

interface Vlan-interface10

ip address 192.168.10.1 255.255.255.0

interface Vlan-interface12

ip address 12.12.12.1 255.255.255.0

mpls enable

mpls ldp enable

interface Vlan-interface14

ip address 14.14.14.1 255.255.255.0

mpls enable

mpls ldp enable

interface GigabitEthernet1/0/1

port link-mode bridge

port access vlan 12

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 14

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 10

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

vlan 23

vlan 30

vlan 34

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 Vlan-interface23

ip address 23.23.23.3 255.255.255.0

mpls enable

mpls ldp enable

interface Vlan-interface30

ip address 192.168.20.1 255.255.255.0

interface Vlan-interface34

ip address 34.34.34.3 255.255.255.0

mpls enable

mpls ldp enable

interface GigabitEthernet1/0/1

port link-mode bridge

port access vlan 34

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 23

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 30

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

vlan 12

vlan 23

mpls ldp

lsp-trigger prefix-list P1

interface LoopBack0

ip address 2.2.2.2 255.255.255.255

interface Vlan-interface12

ip address 12.12.12.2 255.255.255.0

mpls enable

mpls ldp enable

interface Vlan-interface23

ip address 23.23.23.2 255.255.255.0

mpls enable

mpls ldp enable

interface GigabitEthernet1/0/1

port link-mode bridge

port access vlan 12

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 23

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

vlan 14

vlan 34

mpls ldp

lsp-trigger prefix-list P2

interface LoopBack0

ip address 4.4.4.4 255.255.255.255

interface Vlan-interface14

ip address 14.14.14.4 255.255.255.0

ospf cost 10

mpls enable

mpls ldp enable

interface Vlan-interface34

ip address 34.34.34.4 255.255.255.0

ospf cost 10

mpls enable

mpls ldp enable

interface GigabitEthernet1/0/1

port link-mode bridge

port access vlan 34

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 14

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

Example: Configuring SBFD for an LSP

Network configuration

As shown in Figure 2, a company has two branches that are connected to the MPLS backbone. It requires the MPLS backbone to establish LSPs for communication between the branches, and to provide high availability services for uninterrupted business between the branches.

To meet the requirements:

· Establish LSPs by using LDP.

· Configure OSPF FRR on the MPLS backbone so LDP can establish a primary LSP and a backup LSP.

· Configure SBFD for the primary LSP. When the primary LSP fails, SBFD can quickly detect the failure and notify LDP of the failure, so LDP can immediately switch traffic to the backup LSP.

Figure 2 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Not supported
S6525XE-HI switch series	Not supported
S5850 switch series	Not supported
S5560X-EI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
ES5500 switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F switch MS4520V2-30C switch MS4520V2-54C switch	Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 65xx, Release 6615Pxx, Release 6628Pxx

Restrictions and guidelines

Before configuration, disable the spanning tree feature globally or map each VLAN to an MSTI.

Procedures

1. Configure IP addresses for interfaces:

# On PE 1, configure IP addresses and masks for interfaces, including the loopback interface, as shown in Figure 2.

<PE1> system-view

[PE1] vlan 10

[PE1-vlan10] port gigabitethernet 1/0/3

[PE1-vlan10] quit

[PE1] interface vlan-interface 10

[PE1-Vlan-interface10] ip address 192.168.10.1 24

[PE1] vlan 12

[PE1-vlan12] port gigabitethernet 1/0/1

[PE1-vlan12] quit

[PE1] interface vlan-interface 12

[PE1-Vlan-interface12] ip address 12.12.12.1 24

[PE1-Vlan-interface12] quit

[PE1] vlan 14

[PE1-vlan14] port gigabitethernet 1/0/2

[PE1-vlan14] quit

[PE1] interface vlan-interface 14

[PE1-Vlan-interface14] ip address 14.14.14.1 24

[PE1-Vlan-interface14] quit

[PE1] interface loopback 0

[PE1-LoopBack0] ip address 1.1.1.1 32

[PE1-LoopBack0] quit

2. Configure OSPF to ensure IP connectivity within the MPLS backbone, 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

# On P 2, set the OSPF cost to 10 for VLAN-interface 14 and VLAN-interface 34. This setting ensures that the backup LSP has a larger OSPF cost than the primary LSP.

[P2] interface vlan-interface 14

[P2-Vlan-interface14] ospf cost 10

[P2-Vlan-interface14] quit

[P2] interface vlan-interface 34

[P2-Vlan-interface34] ospf cost 10

[P2-Vlan-interface34] quit

3. Configure basic MPLS and MPLS LDP:

# Configure PE 1.

[PE1] mpls lsr-id 1.1.1.1

[PE1] mpls ldp

[PE1-ldp] quit

[PE1] interface vlan-interface 12

[PE1-Vlan-interface12] mpls enable

[PE1-Vlan-interface12] mpls ldp enable

[PE1-Vlan-interface12] quit

[PE1] interface vlan-interface 14

[PE1-Vlan-interface14] mpls enable

[PE1-Vlan-interface14] mpls ldp enable

[PE1-Vlan-interface14] quit

# Configure P 1.

[P1] mpls lsr-id 2.2.2.2

[P1] mpls ldp

[P1-ldp] quit

[P1] interface vlan-interface 12

[P1-Vlan-interface12] mpls enable

[P1-Vlan-interface12] mpls ldp enable

[P1-Vlan-interface12] quit

[P1] interface vlan-interface 23

[P1-Vlan-interface23] mpls enable

[P1-Vlan-interface23] mpls ldp enable

[P1-Vlan-interface23] quit

# Configure PE 2.

[PE2] mpls lsr-id 3.3.3.3

[PE2] mpls ldp

[PE2-ldp] quit

[PE2] interface vlan-interface 23

[PE2-Vlan-interface23] mpls enable

[PE2-Vlan-interface23] mpls ldp enable

[PE2-Vlan-interface23] quit

[PE2] interface vlan-interface 34

[PE2-Vlan-interface34] mpls enable

[PE2-Vlan-interface34] mpls ldp enable

[PE2-Vlan-interface34] quit

# Configure P 2.

[P2] mpls lsr-id 4.4.4.4

[P2] mpls ldp

[P2-ldp] quit

[P2] interface vlan-interface 14

[P2-Vlan-interface14] mpls enable

[P2-Vlan-interface14] mpls ldp enable

[P2-Vlan-interface14] quit

[P2] interface vlan-interface 34

[P2-Vlan-interface34] mpls enable

[P2-Vlan-interface34] mpls ldp enable

[P2-Vlan-interface34] quit

# Verify that LDP sessions in Operational state have been established on each device. The following shows the output on PE 1.

[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

4. Configure LSP generation policies to establish LSPs to destinations 192.168.10.0/24, 192.168.20.0/24, 1.1.1.1/32, and 3.3.3.3/32:

# On PE 1, create 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, create 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, create IP prefix list PE2, 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, create 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

[PE1]display mpls ldp lsp

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

Statistics:

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

FEC In/Out Label Nexthop OutInterface

1.1.1.1/32 3/-

-/1151(L)

-/1279(L)

3.3.3.3/32 -/1150 12.12.12.2 Vlan12

1150/1150 12.12.12.2 Vlan12

-/1150(B) 12.12.12.2 Vlan14

1150/1150(B) 12.12.12.2 Vlan14

192.168.10.0/24 1141/-

-/1141(L)

192.168.20.0/24 -/1133 12.12.12.2 Vlan12

1133/1133 12.12.12.2 Vlan12

-/1133(B) 14.14.14.4 Vlan14

1133/1133(B) 14.14.14.4 Vlan14

5. Enable BFD for MPLS and use SBFD to verify LSP connectivity:

# Configure PE 1.

[PE1] mpls bfd enable

[PE1] sbfd local-discriminator 3000000

[PE1] mpls sbfd 3.3.3.3 32 remote 2000000

# Configure PE 2.

[PE2] mpls bfd enable

[PE2] sbfd local-discriminator 2000000

[PE2] mpls sbfd 1.1.1.1 32 remote 3000000

Verifying the configuration

1. Display SBFD information for LSPs on PE 1 and PE 2. The following shows the output on PE 1.

[PE1] display mpls sbfd

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

FEC Type: LSP

FEC Info:

Destination: 3.3.3.3

Mask Length: 32

NHLFE ID: 2

Local Discr: 513 Remote Discr: 2000000

Source IP: 1.1.1.1 Destination IP: 127.0.0.1

Session State: Up

Template Name: -

2. Execute the tracert mpls ipv4 command on PE 1. The output shows that the primary LSP is in use.

NOTE:

Before you use the tracert feature, enable sending ICMP time exceeded messages on intermediate devices, and enable sending ICMP destination unreachable messages 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/[1148]

1 12.12.12.2 2 ms Transit 23.23.23.3/[1148]

2 23.23.23.3 2 ms Egress

3. Verify that the ping operation from PE 1 to PE 2 will not fail after VLAN-interface 23 on P 1 is shut down during the ping operation:

# Ping PE 2 from PE 1.

[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 VLAN-interface 23 on P 1.

[P1] interface vlan-interface 23

[P1-Vlan-interface23] shutdown

# View the ping command output. The output shows that the communication was interrupted, and then immediately resumed.

[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

4. Execute the tracert mpls ipv4 command on PE 1. The output shows that the backup LSP is in use.

[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/[1276]

1 14.14.14.4 2 ms Transit 34.34.34.3/[1148]

2 34.34.34.3 2 ms Egress

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

vlan 10

vlan 12

vlan 14

mpls ldp

lsp-trigger prefix-list PE1

mpls bfd enable

interface LoopBack0

ip address 1.1.1.1 255.255.255.255

interface Vlan-interface10

ip address 192.168.10.1 255.255.255.0

interface Vlan-interface12

ip address 12.12.12.1 255.255.255.0

mpls enable

mpls ldp enable

interface Vlan-interface14

ip address 14.14.14.1 255.255.255.0

mpls enable

mpls ldp enable

interface GigabitEthernet1/0/1

port link-mode bridge

port access vlan 12

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 14

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 10

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 sbfd 3.3.3.3 32 remote 2000000

· 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

vlan 23

vlan 30

vlan 34

sbfd local-discriminator 2000000

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 Vlan-interface23

ip address 23.23.23.3 255.255.255.0

mpls enable

mpls ldp enable

interface Vlan-interface30

ip address 192.168.20.1 255.255.255.0

interface Vlan-interface34

ip address 34.34.34.3 255.255.255.0

mpls enable

mpls ldp enable

interface GigabitEthernet1/0/1

port link-mode bridge

port access vlan 34

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 23

interface GigabitEthernet1/0/3

port link-mode bridge

port access vlan 30

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

vlan 12

vlan 23

mpls ldp

lsp-trigger prefix-list P1

interface LoopBack0

ip address 2.2.2.2 255.255.255.255

interface Vlan-interface12

ip address 12.12.12.2 255.255.255.0

mpls enable

mpls ldp enable

interface Vlan-interface23

ip address 23.23.23.2 255.255.255.0

mpls enable

mpls ldp enable

interface GigabitEthernet1/0/1

port link-mode bridge

port access vlan 12

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 23

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

vlan 14

vlan 34

mpls ldp

lsp-trigger prefix-list P2

interface LoopBack0

ip address 4.4.4.4 255.255.255.255

interface Vlan-interface14

ip address 14.14.14.4 255.255.255.0

ospf cost 10

mpls enable

mpls ldp enable

interface Vlan-interface34

ip address 34.34.34.4 255.255.255.0

ospf cost 10

mpls enable

mpls ldp enable

interface GigabitEthernet1/0/1

port link-mode bridge

port access vlan 34

interface GigabitEthernet1/0/2

port link-mode bridge

port access vlan 14

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

H3C Fixed Port Campus Switches Configuration Examples-6W104

Introduction

Prerequisites

Example: Configuring BFD for an LSP

Network configuration

Applicable hardware and software versions

Restrictions and guidelines

Procedures

Verifying the configuration

Configuration files

Example: Configuring SBFD for an LSP

Network configuration

Applicable hardware and software versions

Restrictions and guidelines

Procedures

Verifying the configuration

Configuration files

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