H3C MPLS TE Forwarding Adjacency Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Software version: Release 7577P04

Document version: 6W100-20190330

 

Contents

Introduction· 1

Prerequisites· 1

Example: Configuring MPLS TE forwarding adjacency· 1

Network configuration· 1

Analysis· 2

Procedures· 2

Verifying the configuration· 4

Configuration files· 5

Related documentation· 8

 

Introduction

This document provides MPLS TE forwarding adjacency configuration examples.

Prerequisites

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 TE forwarding adjacency.

Example: Configuring MPLS TE forwarding adjacency

Network configuration

As shown in Figure 1, Device A, Device B, Device C, and Device D run OSPF.

Establish an MPLS TE tunnel from Device B to Device D that uses the path Device B—Device C—Device D, and configure MPLS TE forwarding adjacency for the tunnel.

Before the tunnel is established, traffic from Device A to Device D is forwarded through the direct link Device A—Device D. After the tunnel is established, the traffic is forwarded through the MPLS TE tunnel.

Figure 1 Network diagram

 

 

 

Analysis

·          To make forwarding adjacency take effect, you must establish two MPLS TE tunnels in opposite directions between Device B and Device D, and enable forwarding adjacency on both devices.

·          For the MPLS TE tunnel to use the path Device B—Device C—Device D, configure the path as the explicit path for the tunnel.

·          For traffic from Device A to Device D to be forwarded through the MPLS TE tunnel, make sure the tunnel's metric is less than 15 (metric 25 minus 10). This example uses 12.

Procedures

1.        Configure IP addresses for interfaces, configure basic OSPF, and set OSPF costs. (Details not shown.) For the configuration, see "Configuration files."

2.        Enable MPLS TE on each node and interface that the MPLS TE tunnel traverses:

# On Device B, configure an LSR ID, and enable MPLS, MPLS TE, and RSVP-TE.

[DeviceB] mpls lsr-id 2.2.2.2

[DeviceB] mpls te

[DeviceB-te] quit

[DeviceB] rsvp

[DeviceB-rsvp] quit

[DeviceB] interface vlan-interface 23

[DeviceB-Vlan-interface23] mpls enable

[DeviceB-Vlan-interface23] mpls te enable

[DeviceB-Vlan-interface23] rsvp enable

[DeviceB-Vlan-interface23] quit

# On Device C, configure an LSR ID, and enable MPLS, MPLS TE, and RSVP-TE.

[DeviceC] mpls lsr-id 3.3.3.3

[DeviceC] mpls te

[DeviceC-te] quit

[DeviceC] rsvp

[DeviceC-rsvp] quit

[DeviceC] interface vlan-interface 23

[DeviceC-Vlan-interface23] mpls enable

[DeviceC-Vlan-interface23] mpls te enable

[DeviceC-Vlan-interface23] rsvp enable

[DeviceC-Vlan-interface23] ospf cost 10

[DeviceC-Vlan-interface23] quit

[DeviceC] interface vlan-interface 34

[DeviceC-Vlan-interface34] mpls enable

[DeviceC-Vlan-interface34] mpls te enable

[DeviceC-Vlan-interface34] rsvp enable

[DeviceC-Vlan-interface34] ospf cost 10

[DeviceC-Vlan-interface34] quit

# On Device D, configure an LSR ID, and enable MPLS, MPLS TE, and RSVP-TE.

[DeviceD] mpls lsr-id 4.4.4.4

[DeviceD] mpls te

[DeviceD-te] quit

[DeviceD] rsvp

[DeviceD-rsvp] quit

[DeviceD] interface vlan-interface 34

[DeviceD-Vlan-interface34] mpls enable

[DeviceD-Vlan-interface34] mpls te enable

[DeviceD-Vlan-interface34] rsvp enable

[DeviceD-Vlan-interface34] quit

3.        Configure OSPF TE to advertise link TE attributes:

# On Device B, enable opaque LSA advertisement and reception, and enable MPLS TE for OSPF area 0. By default, opaque LSA advertisement and reception are enabled.

[DeviceB] ospf

[DeviceB-ospf-1] opaque-capability enable

[DeviceB-ospf-1] area 0

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

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

[DeviceB-ospf-1] quit

# On Device C, enable opaque LSA advertisement and reception, and enable MPLS TE for OSPF area 0. By default, opaque LSA advertisement and reception are enabled.

[DeviceC] ospf

[DeviceC-ospf-1] opaque-capability enable

[DeviceC-ospf-1] area 0

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

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

[DeviceC-ospf-1] quit

# On Device D, enable opaque LSA advertisement and reception, and enable MPLS TE for OSPF area 0. By default, opaque LSA advertisement and reception are enabled.

[DeviceD] ospf

[DeviceD-ospf-1] opaque-capability enable

[DeviceD-ospf-1] area 0

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

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

[DeviceD-ospf-1] quit

4.        Configure MPLS TE tunnels:

# On Device B, configure MPLS TE tunnel interface Tunnel 1, and specify the tunnel destination address as the LSR ID of Device D.

[DeviceB] interface tunnel 1 mode mpls-te

[DeviceB-Tunnel1] ip address 9.2.2.2 255.255.255.0

[DeviceB-Tunnel1] destination 4.4.4.4

# Configure MPLS TE to use RSVP-TE to establish the tunnel.

[DeviceB-Tunnel1] mpls te signaling rsvp-te

[DeviceB-Tunnel1] quit

# Configure an explicit path named tun1.

[DeviceB] explicit-path tun1

[DeviceB-explicit-path-tun1] nexthop 23.23.23.3

[DeviceB-explicit-path-tun1] nexthop 34.34.34.4

[DeviceB-explicit-path-tun1]quit

# Specify the explicit path to be used as tun1.

[DeviceB] interface tunnel 1

[DeviceB–Tunnel1] mpls te path preference 1 explicit-path tun1

# Enable forwarding adjacency for the tunnel.

[DeviceA-Tunnel1] mpls te igp advertise

# Enable OSPF on tunnel interface Tunnel 1 and set the OSPF cost to 12 on the interface.

[DeviceA-Tunnel1] ospf 1 area 0

[DeviceA-Tunnel1] ospf cost 12

[DeviceA-Tunnel1] quit

# On Device D, configure MPLS TE tunnel interface Tunnel 1, and specify the tunnel destination address as the LSR ID of Device B.

[DeviceD] interface tunnel 1 mode mpls-te

[DeviceD-Tunnel1] ip address 9.4.4.4 255.255.255.0

[DeviceD-Tunnel1] destination 2.2.2.2

# Configure MPLS TE to use RSVP-TE to establish the tunnel.

[DeviceD-Tunnel1] mpls te signaling rsvp-te

[DeviceD-Tunnel1] quit

# Configure an explicit path named tun1.

[DeviceD] explicit-path tun1

[DeviceD-explicit-path-tun1] nexthop 34.34.34.3

[DeviceD-explicit-path-tun1] nexthop 23.23.23.2

[DeviceD-explicit-path-tun1]quit

# Specify the explicit path to be used as tun1.

[DeviceD] interface tunnel 1

[DeviceD–Tunnel1] mpls te path preference 1 explicit-path tun1

# Enable forwarding adjacency for the tunnel.

[DeviceD-Tunnel1] mpls te igp advertise

# Enable OSPF on tunnel interface Tunnel 1 and set the OSPF cost to 12 on the interface.

[DeviceD-Tunnel1] ospf 1 area 0

[DeviceD-Tunnel1] ospf cost 12

[DeviceD-Tunnel1] quit

Verifying the configuration

# Verify that the tunnel interfaces on Device B and Device D are up. This example uses Device B.

[DeviceB] display interface tunnel brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface            Link Protocol Primary IP      Description

Tun1                 UP   UP       9.2.2.2         Tunnel1 Interface

# Display routing table information on Device A. The output shows that the next hop of the route to Device D is Device B, and the cost is 22. The MPLS TE tunnel has been used during IGP route calculation.

[Device A] display ip routing-table

 

Destinations : 24        Routes : 24

 

Destination/Mask    Proto  Pre  Cost         NextHop         Interface

0.0.0.0/32          Direct 0    0            127.0.0.1       InLoop0

1.1.1.1/32          Direct 0    0            127.0.0.1       InLoop0

2.2.2.2/32          OSPF   10   10           12.12.12.2      Vlan12

3.3.3.3/32          OSPF   10   20           12.12.12.2      Vlan12

4.4.4.4/32          OSPF   10   22           12.12.12.2      Vlan12

9.2.2.0/24          OSPF   10   22           12.12.12.2      Vlan12

9.4.4.0/24          OSPF   10   34           12.12.12.2      Vlan12

12.12.12.0/24       Direct 0    0            12.12.12.1      Vlan12

12.12.12.0/32       Direct 0    0            12.12.12.1      Vlan12

12.12.12.1/32       Direct 0    0            127.0.0.1       InLoop0

12.12.12.255/32     Direct 0    0            12.12.12.1      Vlan12

14.14.14.0/24       Direct 0    0            14.14.14.1      Vlan14

14.14.14.0/32       Direct 0    0            14.14.14.1      Vlan14

14.14.14.1/32       Direct 0    0            127.0.0.1       InLoop0

14.14.14.255/32     Direct 0    0            14.14.14.1      Vlan14

23.23.23.0/24       OSPF   10   20           12.12.12.2      Vlan12

34.34.34.0/24       OSPF   10   30           12.12.12.2      Vlan12

127.0.0.0/8         Direct 0    0            127.0.0.1       InLoop0

127.0.0.0/32        Direct 0    0            127.0.0.1       InLoop0

127.0.0.1/32        Direct 0    0            127.0.0.1       InLoop0

127.255.255.255/32  Direct 0    0            127.0.0.1       InLoop0

224.0.0.0/4         Direct 0    0            0.0.0.0         NULL0

224.0.0.0/24        Direct 0    0            0.0.0.0         NULL0

255.255.255.255/32  Direct 0    0            127.0.0.1       InLoop0

Configuration files

·          Device 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

#

vlan 12

#

vlan 14

#

interface LoopBack0

 ip address 1.1.1.1 255.255.255.255

#

interface Vlan-interface12

 ip address 12.12.12.1 255.255.255.0

 ospf cost 10

#

interface Vlan-interface14

 ip address 14.14.14.1 255.255.255.0

 ospf cost 25

·          Device 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

#

explicit-path tun1

 nexthop index 1 23.23.23.3 include strict

 nexthop index 101 34.34.34.4 include strict

#

rsvp

#

vlan 12

#

vlan 23

#

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

 ospf cost 10

#

interface Vlan-interface23

 ip address 23.23.23.2 255.255.255.0

 ospf cost 10

 mpls enable

 mpls te enable

 rsvp enable

#

interface Tunnel1 mode mpls-te

 ip address 9.2.2.2 255.255.255.0

 ospf cost 12

 ospf 1 area 0.0.0.0

 mpls te path preference 1 explicit-path tun1

 mpls te igp advertise

 destination 4.4.4.4

#

·          Device 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

  mpls te enable

#

 mpls lsr-id 3.3.3.3

#

mpls te

#

rsvp

#

vlan 23

#

vlan 34

#

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

 ospf cost 10

 mpls enable

 mpls te enable

 rsvp enable

#

interface Vlan-interface34

 ip address 34.34.34.3 255.255.255.0

 ospf cost 10

 mpls enable

 mpls te enable

 rsvp enable

#

·          Device 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

#

explicit-path tun1

 nexthop index 1 34.34.34.3 include strict

 nexthop index 101 23.23.23.2 include strict

#

rsvp

#

vlan 14

#

vlan 34

#

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 25

#

interface Vlan-interface34

 ip address 34.34.34.4 255.255.255.0

 ospf cost 10

 mpls enable

 mpls te enable

 rsvp enable

#

interface Tunnel1 mode mpls-te

 ip address 9.4.4.4 255.255.255.0

 ospf cost 12

 ospf 1 area 0.0.0.0

 mpls te path preference 1 explicit-path tun1

 mpls te igp advertise

 destination 2.2.2.2

#

Related documentation

·          H3C S7500E-XS Switch Series MPLS Configuration Guide-R757X

·          H3C S7500E-XS Switch Series MPLS Command Reference-R757X