H3C S12500R Switch Router Series
MPLS SR Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contents

Introduction· 1

Prerequisites· 1

Example: Configuring MPLS SR over LDP·· 1

Network configuration· 1

Analysis· 2

Software versions used· 2

Procedures· 2

Configuring Device A· 2

Configuring Device B· 3

Configuring Device C· 4

Configuring Device D·· 4

Configuring Device E· 5

Verifying the configuration· 6

Configuration files· 6

Related documentation· 9

 

Introduction

This document provides MPLS SR configuration examples.

Segment Routing (SR) is a source routing technology. The source node selects a path for the packets, and then encodes the path in the packet header as an ordered list of segments. Each segment is identified by the segment identifier (SID). The SR nodes along the path forward the packets based on the SIDs in the packets. Only the source node needs to maintain the path status.

SR can operate with MPLS. In an MPLS network, SR uses MPLS labels as SIDs to forward packets on an LSP.

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 SR.

Example: Configuring MPLS SR over LDP

Network configuration

As shown in Figure 1, configure the devices so the two SR networks can communicate across the LDP network.

Figure 1 Network diagram

 

Table 1 Interface and IP address assignment

Device	Interface	IP address	Device	Interface	IP address
Device A	Loop1	1.1.1.1/32	Device B	Loop1	2.2.2.2/32
	HGE1/0/1	10.0.0.1/24		HGE1/0/1	10.0.0.2/24
Device C	Loop1	3.3.3.3/32		HGE1/0/2	11.0.0.1/24
	HGE1/0/1	12.0.0.1/24	Device D	Loop1	4.4.4.4/32
	HGE1/0/2	11.0.0.2/24		HGE1/0/2	12.0.0.2/24
Device E	Loop1	5.5.5.5/32		HGE1/0/1	13.0.0.1/24
	HGE1/0/1	13.0.0.2/24

 

Analysis

To enable the two SR networks to communicate across the LDP network, you must perform the following tasks:

·     Configure Device A, Device B, Device C, Device D, and Device E to run IS-IS.

·     Configure Device B, Device C, and Device D to run LDP.

·     Configure Device A, Device B, Device D, and Device E to run MPLS SR.

Software versions used

This configuration example was created and verified on Release 3606.

Procedures

Configuring Device A

# Configure IP addresses and masks for interfaces. (Details not shown.)

#  Configure IS-IS to achieve network level connectivity and set the IS-IS cost style to wide.

<DeviceA> system-view

[DeviceA] isis 1

[DeviceA-isis-1] network-entity 00.0000.0000.0001.00

[DeviceA-isis-1] cost-style wide

[DeviceA-isis-1] quit

[DeviceA] interface hundredgige 1/0/1

[DeviceA-HundredGigE1/0/1] isis enable 1

[DeviceA-HundredGigE1/0/1] quit

[DeviceA] interface loopback 1

[DeviceA-LoopBack1] isis enable 1

[DeviceA-LoopBack1] quit

# Set the LSR ID.

[DeviceA] mpls lsr-id 1.1.1.1

# Enable MPLS SR.

[DeviceA] isis 1

[DeviceA-isis-1] address-family ipv4

[DeviceA-isis-1-ipv4] segment-routing mpls

[DeviceA-isis-1-ipv4] quit

# Configure the SRGB.

[DeviceA-isis-1] segment-routing global-block 16000 16999

[DeviceA-isis-1] quit

# Configure IS-IS prefix SID.

[DeviceA] interface loopback 1

[DeviceA-LoopBack1] isis prefix-sid index 10

[DeviceA-LoopBack1] quit

Configuring Device B

# Configure IP addresses and masks for interfaces. (Details not shown.)

#  Configure IS-IS to achieve network level connectivity and set the IS-IS cost style to wide.

<DeviceB> system-view

[DeviceB] isis 1

[DeviceB-isis-1] network-entity 00.0000.0000.0002.00

[DeviceB-isis-1] cost-style wide

[DeviceB-isis-1] quit

[DeviceB] interface hundredgige 1/0/1

[DeviceB-HundredGigE1/0/1] isis enable 1

[DeviceB-HundredGigE1/0/1] quit

[DeviceB] interface hundredgige 1/0/2

[DeviceB-HundredGigE1/0/2] isis enable 1

[DeviceB-HundredGigE1/0/2] quit

[DeviceB] interface loopback 1

[DeviceB-LoopBack1] isis enable 1

[DeviceB-LoopBack1] quit

# Set the LSR ID.

[DeviceB] mpls lsr-id 2.2.2.2

# Configure LDP.

[DeviceB] mpls ldp

[DeviceB-ldp] quit

[DeviceB] interface hundredgige 1/0/2

[DeviceB-HundredGigE1/0/2] mpls enable

[DeviceB-HundredGigE1/0/2] mpls ldp enable

[DeviceB-HundredGigE1/0/2] quit

# Enable MPLS SR.

[DeviceB] isis 1

[DeviceB-isis-1] address-family ipv4

[DeviceB-isis-1-ipv4] segment-routing mpls

[DeviceB-isis-1-ipv4] quit

# Configure the SRGB.

[DeviceB-isis-1] segment-routing global-block 17000 17999

[DeviceB-isis-1] quit

# Configure IS-IS prefix SID.

[DeviceB] interface loopback 1

[DeviceB-LoopBack1] isis prefix-sid index 20

[DeviceB-LoopBack1] quit

Configuring Device C

# Configure IP addresses and masks for interfaces. (Details not shown.)

#  Configure IS-IS to achieve network level connectivity and set the IS-IS cost style to wide.

<DeviceC> system-view

[DeviceC] isis 1

[DeviceC-isis-1] network-entity 00.0000.0000.0003.00

[DeviceC-isis-1] cost-style wide

[DeviceC-isis-1] quit

[DeviceC] interface hundredgige 1/0/1

[DeviceC-HundredGigE1/0/1] isis enable 1

[DeviceC-HundredGigE1/0/1] quit

[DeviceC] interface hundredgige 1/0/2

[DeviceC-HundredGigE1/0/2] isis enable 1

[DeviceC-HundredGigE1/0/2] quit

[DeviceC] interface loopback 1

[DeviceC-LoopBack1] isis enable 1

[DeviceC-LoopBack1] quit

# Set the LSR ID.

[DeviceC] mpls lsr-id 3.3.3.3

# Configure LDP.

[DeviceC] mpls ldp

[DeviceC-ldp] quit

[DeviceC] interface hundredgige 1/0/1

[DeviceC-HundredGigE1/0/1] mpls enable

[DeviceC-HundredGigE1/0/1] mpls ldp enable

[DeviceC-HundredGigE1/0/1] quit

[DeviceC] interface hundredgige 1/0/2

[DeviceC-HundredGigE1/0/2] mpls enable

[DeviceC-HundredGigE1/0/2] mpls ldp enable

[DeviceC-HundredGigE1/0/2] quit

Configuring Device D

# Configure IP addresses and masks for interfaces. (Details not shown.)

#  Configure IS-IS to achieve network level connectivity and set the IS-IS cost style to wide.

<DeviceD> system-view

[DeviceD] isis 1

[DeviceD-isis-1] network-entity 00.0000.0000.0004.00

[DeviceD-isis-1] cost-style wide

[DeviceD-isis-1] quit

[DeviceD] interface hundredgige 1/0/1

[DeviceD-HundredGigE1/0/1] isis enable 1

[DeviceD-HundredGigE1/0/1] quit

[DeviceD] interface hundredgige 1/0/2

[DeviceD-HundredGigE1/0/2] isis enable 1

[DeviceD-HundredGigE1/0/2] quit

[DeviceD] interface loopback 1

[DeviceD-LoopBack1] isis enable 1

[DeviceD-LoopBack1] quit

# Set the LSR ID.

[DeviceD] mpls lsr-id 4.4.4.4

# Configure LDP.

[DeviceD] mpls ldp

[DeviceD-ldp] quit

[DeviceD] interface hundredgige 1/0/1

[DeviceD-HundredGigE1/0/1] mpls enable

[DeviceD-HundredGigE1/0/1] mpls ldp enable

[DeviceD-HundredGigE1/0/1] quit

# Enable MPLS SR.

[DeviceD] isis 1

[DeviceD-isis-1] address-family ipv4

[DeviceD-isis-1-ipv4] segment-routing mpls

[DeviceD-isis-1-ipv4] quit

# Configure the SRGB.

[DeviceD-isis-1] segment-routing global-block 18000 18999

[DeviceD-isis-1] quit

# Configure IS-IS prefix SID.

[DeviceD] interface loopback 1

[DeviceD-LoopBack1] isis prefix-sid index 40

[DeviceD-LoopBack1] quit

Configuring Device E

# Configure IP addresses and masks for interfaces. (Details not shown.)

#  Configure IS-IS to achieve network level connectivity and set the IS-IS cost style to wide.

<DeviceE> system-view

[DeviceE] isis 1

[DeviceE-isis-1] network-entity 00.0000.0000.0005.00

[DeviceE-isis-1] cost-style wide

[DeviceE-isis-1] quit

[DeviceE] interface hundredgige 1/0/1

[DeviceE-HundredGigE1/0/1] isis enable 1

[DeviceE-HundredGigE1/0/1] quit

[DeviceE] interface loopback 1

[DeviceE-LoopBack1] isis enable 1

[DeviceE-LoopBack1] quit

# Set the LSR ID.

[DeviceE] mpls lsr-id 5.5.5.5

# Enable MPLS SR.

[DeviceE] isis 1

[DeviceE-isis-1] address-family ipv4

[DeviceE-isis-1-ipv4] segment-routing mpls

[DeviceE-isis-1-ipv4] quit

# Configure the SRGB.

[DeviceE-isis-1] segment-routing global-block 19000 19999

[DeviceE-isis-1] quit

# Configure IS-IS prefix SID.

[DeviceE] interface loopback 1

[DeviceE-LoopBack1] isis prefix-sid index 50

[DeviceE-LoopBack1] quit

Verifying the configuration

# Display LDP LSP information on Device B.

[DeviceB] display mpls ldp lsp

Status Flags: * - stale, L - liberal, B - backup, N/A - unavailable

FECs: 5            Ingress: 3          Transit: 3      Egress: 2

 

FEC                In/Out Label        Nexthop         OutInterface/LSINDEX

1.1.1.1/32         24116/-

                   -/24117(L)

2.2.2.2/32         3/-

                   -/24120(L)

3.3.3.3/32         -/3                 11.0.0.2        HGE1/0/2

                   24121/3             11.0.0.2        HGE1/0/2

4.4.4.4/32         -/24119             11.0.0.2        HGE1/0/2

                   24118/24119         11.0.0.2        HGE1/0/2

5.5.5.5/32         -/24118             11.0.0.2        HGE1/0/2

                   24117/24118         11.0.0.2        HGE1/0/2

# Display IS-IS SRLSP information on Device B.

[DeviceB] display mpls lsp protocol isis

FEC                         Proto    In/Out Label    Interface/Out NHLFE

1.1.1.1/32                  ISIS     17010/3         HGE1/0/1

1.1.1.1/32                  ISIS     -/3             HGE1/0/1

2.2.2.2/32                  ISIS     17020/-         -

4.4.4.4/32                  ISIS     17040/24119     HGE1/0/2

4.4.4.4/32                  ISIS     -/24119         HGE1/0/2

5.5.5.5/32                  ISIS     17050/24118     HGE1/0/2

5.5.5.5/32                  ISIS     -/24118         HGE1/0/2

The output shows that the IS-IS SRLSP entries for Device D and Device E are using LDP labels.

Configuration files

·     Device A:

#

isis 1

 cost-style wide

 segment-routing global-block 16000 16999

 network-entity 00.0000.0000.0001.00

 #

 address-family ipv4 unicast

  segment-routing mpls

#

 mpls lsr-id 1.1.1.1

#

interface LoopBack1

 ip address 1.1.1.1 255.255.255.255

 isis enable 1

 isis prefix-sid index 10

#

interface HundredGigE1/0/1

 port link-mode route

 ip address 10.0.0.1 255.255.255.0

 isis enable 1

#

·     Device B:

#

isis 1

 cost-style wide

 segment-routing global-block 17000 17999

 network-entity 00.0000.0000.0002.00

 #

 address-family ipv4 unicast

  segment-routing mpls

#

 mpls lsr-id 2.2.2.2

#

mpls ldp

#

interface LoopBack1

 ip address 2.2.2.2 255.255.255.255

 isis enable 1

 isis prefix-sid index 20

#

interface HundredGigE1/0/1

 port link-mode route

 ip address 10.0.0.2 255.255.255.0

 isis enable 1

#

interface HundredGigE1/0/2

 port link-mode route

 ip address 11.0.0.1 255.255.255.0

 isis enable 1

 mpls enable

 mpls ldp enable

#

·     Device C:

#

isis 1

 cost-style wide

 network-entity 00.0000.0000.0003.00

#

 mpls lsr-id 3.3.3.3

#

mpls ldp

#

interface LoopBack1

 ip address 3.3.3.3 255.255.255.255

 isis enable 1

#

interface HundredGigE1/0/1

 port link-mode route

 ip address 12.0.0.1 255.255.255.0

 isis enable 1

 mpls enable

 mpls ldp enable

#

interface HundredGigE1/0/2

 port link-mode route

 ip address 11.0.0.2 255.255.255.0

 isis enable 1

 mpls enable

 mpls ldp enable

#

·     Device D:

#

isis 1

 cost-style wide

 segment-routing global-block 18000 18999

 network-entity 00.0000.0000.0004.00

 #

 address-family ipv4 unicast

  segment-routing mpls

#

 mpls lsr-id 4.4.4.4

#

mpls ldp

#

interface LoopBack1

 ip address 4.4.4.4 255.255.255.255

 isis enable 1

 isis prefix-sid index 40

#

interface HundredGigE1/0/1

 port link-mode route

 ip address 13.0.0.1 255.255.255.0

 isis enable 1

#

interface HundredGigE1/0/2

 port link-mode route

 ip address 12.0.0.2 255.255.255.0

 isis enable 1

 mpls enable

 mpls ldp enable

#

·     Device E:

#

isis 1

 cost-style wide

 segment-routing global-block 19000 19999

 network-entity 00.0000.0000.0005.00

 #

 address-family ipv4 unicast

  segment-routing mpls

#

 mpls lsr-id 5.5.5.5

#

interface LoopBack1

 ip address 5.5.5.5 255.255.255.255

 isis enable 1

 isis prefix-sid index 50

#

interface HundredGigE1/0/1

 port link-mode route

 ip address 13.0.0.2 255.255.255.0

 isis enable 1

#

Related documentation

·     H3C S12500R Switch Router Series Segment Routing Command Reference-R3606

·     H3C S12500R Switch Router Series Segment Routing Configuration Guide-R3606