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MPLS Layer 3 VPNs Inter-AS and CSC Configuration Guide ... ... Benefits of MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS Labels 38 How the Inter-AS Works When ASBRs

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  • MPLS Layer 3 VPNs Inter-AS and CSC Configuration Guide, Cisco IOS Release 12.2SR

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  • C O N T E N T S

    MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 1

    Finding Feature Information 1

    Prerequisites for MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 1

    Restrictions for MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 3

    Information About MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 3

    MPLS VPN Inter-AS Introduction 3

    Benefits of MPLS VPN Inter-AS 3

    Use of Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 4

    Information Exchange in an MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4

    Addresses 4

    Transmission of Information in an MPLS VPN Inter-AS with ASBRs Exchanging VPN-

    IPv4 Addresses 4

    Exchange of VPN Routing Information in an MPLS VPN Inter-AS with ASBRs

    Exchanging VPN-IPv4 Addresses 6

    Packet Forwarding Between MPLS VPN Inter-AS Systems with ASBRs Exchanging VPN-

    IPv4 Addresses 8

    Use of a Confederation for MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4

    Addresses 10

    How to Configure MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 11

    Configuring the ASBRs to Exchange VPN-IPv4 Addresses 12

    Configuring EBGP Routing to Exchange VPN Routes Between Subautonomous Systems in a

    Confederation 13

    Verifying Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 16

    Configuration Examples for MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 17

    Configuring MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses Example 18

    Configuration for Autonomous System 1 CE1 Example 18

    Configuration for Autonomous System 1 PE1 Example 19

    Configuration for Autonomous System 1 P1 Example 20

    Configuration for Autonomous System 1 EBGP1 Example 20

    MPLS Layer 3 VPNs Inter-AS and CSC Configuration Guide, Cisco IOS Release 12.2SR iii

  • Configuration for Autonomous System 2 EBGP2 Example 21

    Configuration for Autonomous System 2 P2 Example 22

    Configuration for Autonomous System 2 PE2 Example 23

    Configuration for Autonomous System 2 CE2 Example 24

    Configuring MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses in a

    Confederation Example 25

    Configuration for Autonomous System 1 CE1 Example 25

    Configuration for Autonomous System 1 PE1 Example 26

    Configuration for Autonomous System 1 P1 Example 27

    Configuration for Autonomous System 1 ASBR1 Example 27

    Configuration for Autonomous System 2 ASBR2 Example 28

    Configuration for Autonomous System 2 P2 Example 29

    Configuration for Autonomous System 2 PE2 Example 30

    Configuration for Autonomous System 2 CE2 Example 31

    Additional References 32

    Feature Information for MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses 33

    MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS Labels 35

    Finding Feature Information 35

    Prerequisites for MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS Labels 36

    Restrictions for MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS Labels 37

    Information About MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS

    Labels 37

    MPLS VPN Inter-AS Introduction 37

    Benefits of MPLS VPN Inter-AS 38

    Information About Using MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and

    MPLS Labels 38

    Benefits of MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS Labels 38

    How the Inter-AS Works When ASBRs Exchange IPv4 Routes with MPLS Labels 39

    BGP Routing Information 39

    Types of BGP Messages and MPLS Labels 40

    How BGP Sends MPLS Labels with Routes 40

    How to Configure MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS

    Labels 40

    Configuring the ASBRs to Exchange IPv4 Routes and MPLS Labels 41

    Configuring the Route Reflectors to Exchange VPN-IPv4 Routes 43

    Configuring the Route Reflector to Reflect Remote Routes in Its Autonomous System 45

    Contents

    MPLS Layer 3 VPNs Inter-AS and CSC Configuration Guide, Cisco IOS Release 12.2SR iv

  • Verifying the MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS Labels

    Configuration 48

    Verifying the Route Reflector Configuration 49

    Verifying that CE1 Can Communicate with CE2 50

    Verifying that PE1 Can Communicate with CE2 51

    Verifying that PE2 Can Communicate with CE2 53

    Verifying the ASBR Configuration 54

    Verifying the ASBR Configuration 55

    Configuration Examples for MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and

    MPLS Labels 56

    Configuring MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS Labels

    over an MPLS VPN Service Provider Examples 56

    Route Reflector 1 Configuration Example (MPLS VPN Service Provider) 56

    ASBR1 Configuration Example (MPLS VPN Service Provider) 58

    Route Reflector 2 Configuration Example (MPLS VPN Service Provider) 59

    ASBR2 Configuration Example (MPLS VPN Service Provider) 59

    Configuring MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS Labels

    over a Non-MPLS VPN Service Provider Examples 61

    Route Reflector 1 Configuration Example (Non-MPLS VPN Service Provider) 61

    ASBR1 Configuration Example (Non-MPLS VPN Service Provider) 62

    Route Reflector 2 Configuration Example (Non-MPLS VPN Service Provider) 64

    ASBR2 Configuration Example (Non-MPLS VPN Service Provider) 64

    ASBR3 Configuration Example (Non-MPLS VPN Service Provider) 65

    Route Reflector 3 Configuration Example (Non-MPLS VPN Service Provider) 67

    ASBR4 Configuration Example (Non-MPLS VPN Service Provider) 67

    Additional References 68

    Feature Information for MPLS VPN Inter-AS with ASBRs Exchanging IPv4 Routes and MPLS

    Labels 70

    MPLS VPN Carrier Supporting Carrier Using LDP and an IGP 73

    Finding Feature Information 73

    Prerequisites for MPLS VPN CSC with LDP and IGP 73

    Restrictions for MPLS VPN CSC with LDP and IGP 74

    Information About MPLS VPN CSC with LDP and IGP 75

    MPLS VPN CSC Introduction 75

    Benefits of Implementing MPLS VPN CSC 75

    Configuration Options for MPLS VPN CSC with LDP and IGP 76

    Contents

    MPLS Layer 3 VPNs Inter-AS and CSC Configuration Guide, Cisco IOS Release 12.2SR v

  • Customer Carrier Is an ISP 76

    Customer Carrier Is a BGP MPLS VPN Service Provider 79

    How to Configure MPLS VPN CSC with LDP and IGP 81

    Confi

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