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MPLS L3VPN configuration examples > Configuring MPLS L3VPN inter-AS option C

 

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Configuring MPLS L3VPN inter-AS option C

Network requirements

Site 1 and Site 2 belong to the same VPN. Site 1 accesses the network through PE 1 in AS 100. Site 2 accesses the network through PE 2 in AS 600. PEs in the same AS run IS-IS.

PE 1 and ASBR-PE 1 exchange labeled IPv4 routes through IBGP. PE 2 and ASBR-PE 2 exchange labeled IPv4 routes through IBGP. PE 1 and PE 2 exchange VPNv4 routes through MP-EBGP.

ASBR-PE 1 and ASBR-PE 2 use their respective routing policies and label routes received from each other.

ASBR-PE 1 and ASBR-PE 2 use EBGP to exchange labeled IPv4 routes.

Figure 67: Network diagram

Table 16: Interface and IP address assignment

Device

Interface

IP address

Device

Interface

IP address

PE 1

Loop0

2.2.2.9/32

PE 2

Loop0

5.5.5.9/32

Vlan-int11

1.1.1.2/8

Vlan-int11

9.1.1.2/8

Vlan-int12

30.0.0.1/24

Vlan-int12

20.0.0.1/24

ASBR-PE 1

Loop0

3.3.3.9/32

ASBR-PE 2

Loop0

4.4.4.9/32

Vlan-int11

1.1.1.1/8

Vlan-int11

9.1.1.1/8

Vlan-int12

11.0.0.2/8

Vlan-int12

11.0.0.1/8

CE 1

Vlan-int12

30.0.0.2/24

CE 2

Vlan-int12

20.0.0.2/24

Configuration procedure

  1. Configure CE 1:

    # Configure an IP address for VLAN-interface 12.

    <CE1> system-view
[CE1] interface vlan-interface 12
[CE1-Vlan-interface12] ip address 30.0.0.2 24
[CE1-Vlan-interface12] quit

    # Establish an EBGP peer relationship with PE 1, and redistribute VPN routes.

    [CE1] bgp 65001
[CE1-bgp-default] peer 30.0.0.1 as-number 100
[CE1-bgp-default] address-family ipv4 unicast
[CE1-bgp-default-ipv4] peer 30.0.0.1 enable
[CE1-bgp-default-ipv4] import-route direct
[CE1-bgp-default-ipv4] quit
[CE1-bgp-default] quit

  2. Configure PE 1:

    # Configure IS-IS on PE 1.

    <PE1> system-view
[PE1] isis 1
[PE1-isis-1] network-entity 10.111.111.111.111.00
[PE1-isis-1] quit

    # Configure the LSR ID, and enable MPLS and LDP.

    [PE1] mpls lsr-id 2.2.2.9
[PE1] mpls ldp
[PE1-ldp] quit

    # Configure VLAN-interface 11, and enable IS-IS, MPLS, and LDP on the interface.

    [PE1] interface vlan-interface 11
[PE1-Vlan-interface11] ip address 1.1.1.2 255.0.0.0
[PE1-Vlan-interface11] isis enable 1
[PE1-Vlan-interface11] mpls enable
[PE1-Vlan-interface11] mpls ldp enable
[PE1-Vlan-interface11] quit

    # Configure Loopback 0, and enable IS-IS on it.

    [PE1] interface loopback 0
[PE1-LoopBack0] ip address 2.2.2.9 32
[PE1-LoopBack0] isis enable 1
[PE1-LoopBack0] quit

    # Create VPN instance vpn1, and configure the RD and route target attributes.

    [PE1] ip vpn-instance vpn1
[PE1-vpn-instance-vpn1] route-distinguisher 11:11
[PE1-vpn-instance-vpn1] vpn-target 1:1 2:2 3:3 import-extcommunity
[PE1-vpn-instance-vpn1] vpn-target 3:3 export-extcommunity
[PE1-vpn-instance-vpn1] quit

    # Associate VLAN-interface 12 with VPN instance vpn1, and specify the IP address for the interface.

    [PE1] interface vlan-interface 12
[PE1-Vlan-interface12] ip binding vpn-instance vpn1
[PE1-Vlan-interface12] ip address 30.0.0.1 24
[PE1-Vlan-interface12] quit

    # Enable BGP on PE 1.

    [PE1] bgp 100

    # Enable the capability to advertise labeled routes to IBGP peer 3.3.3.9 and to receive labeled routes from the peer.

    [PE1-bgp-default] peer 3.3.3.9 as-number 100
[PE1-bgp-default] peer 3.3.3.9 connect-interface loopback 0
[PE1-bgp-default] address-family ipv4 unicast
[PE1-bgp-default-ipv4] peer 3.3.3.9 enable
[PE1-bgp-default-ipv4] peer 3.3.3.9 label-route-capability
[PE1-bgp-default-ipv4] quit

    # Configure the maximum hop count from PE 1 to EBGP peer 5.5.5.9 as 10.

    [PE1-bgp-default] peer 5.5.5.9 as-number 600
[PE1-bgp-default] peer 5.5.5.9 connect-interface loopback 0
[PE1-bgp-default] peer 5.5.5.9 ebgp-max-hop 10

    # Configure peer 5.5.5.9 as a VPNv4 peer.

    [PE1-bgp-default] address-family vpnv4
[PE1-bgp-default-vpnv4] peer 5.5.5.9 enable
[PE1-bgp-default-vpnv4] quit

    # Establish an EBGP peer relationship with CE 1, and add the learned BGP routes to the routing table of VPN instance vpn1.

    [PE1-bgp-default] ip vpn-instance vpn1
[PE1-bgp-default-vpn1] peer 30.0.0.2 as-number 65001
[PE1-bgp-default-vpn1] address-family ipv4 unicast
[PE1-bgp-default-ipv4-vpn1] peer 30.0.0.2 enable
[PE1-bgp-default-ipv4-vpn1] quit
[PE1-bgp-default-vpn1] quit
[PE1-bgp-default] quit

  3. Configure ASBR-PE 1:

    # Enable IS-IS on ASBR-PE 1.

    <ASBR-PE1> system-view
[ASBR-PE1] isis 1
[ASBR-PE1-isis-1] network-entity 10.222.222.222.222.00
[ASBR-PE1-isis-1] quit

    # Configure the LSR ID, and enable MPLS and LDP.

    [ASBR-PE1] mpls lsr-id 3.3.3.9
[ASBR-PE1] mpls ldp
[ASBR-PE1-ldp] quit

    # Configure VLAN-interface 11, and enable IS-IS, MPLS, and LDP on the interface.

    [ASBR-PE1] interface vlan-interface 11
[ASBR-PE1-Vlan-interface11] ip address 1.1.1.1 255.0.0.0
[ASBR-PE1-Vlan-interface11] isis enable 1
[ASBR-PE1-Vlan-interface11] mpls enable
[ASBR-PE1-Vlan-interface11] mpls ldp enable
[ASBR-PE1-Vlan-interface11] quit

    # Configure VLAN-interface 12, and enable MPLS on it.

    [ASBR-PE1] interface vlan-interface 12
[ASBR-PE1-Vlan-interface12] ip address 11.0.0.2 255.0.0.0
[ASBR-PE1-Vlan-interface12] mpls enable
[ASBR-PE1-Vlan-interface12] quit

    # Configure Loopback 0, and enable IS-IS on it.

    [ASBR-PE1] interface loopback 0
[ASBR-PE1-LoopBack0] ip address 3.3.3.9 32
[ASBR-PE1-LoopBack0] isis enable 1
[ASBR-PE1-LoopBack0] quit

    # Create routing policies.

    [ASBR-PE1] route-policy policy1 permit node 1
[ASBR-PE1-route-policy-policy1-1] apply mpls-label
[ASBR-PE1-route-policy-policy1-1] quit
[ASBR-PE1] route-policy policy2 permit node 1
[ASBR-PE1-route-policy-policy2-1] if-match mpls-label
[ASBR-PE1-route-policy-policy2-1] apply mpls-label
[ASBR-PE1-route-policy-policy2-1] quit

    # Enable BGP on ASBR-PE 1, and apply the routing policy policy2 to routes advertised to IBGP peer 2.2.2.9.

    [ASBR-PE1] bgp 100
[ASBR-PE1-bgp-default] peer 2.2.2.9 as-number 100
[ASBR-PE1-bgp-default] peer 2.2.2.9 connect-interface loopback 0
[ASBR-PE1-bgp-default] address-family ipv4 unicast
[ASBR-PE1-bgp-default-ipv4] peer 2.2.2.9 enable
[ASBR-PE1-bgp-default-ipv4] peer 2.2.2.9 route-policy policy2 export

    # Enable the capability to advertise labeled routes to IBGP peer 2.2.2.9 and to receive labeled routes from the peer.

    [ASBR-PE1-bgp-default-ipv4] peer 2.2.2.9 label-route-capability

    # Redistribute routes from IS-IS process 1 to BGP.

    [ASBR-PE1-bgp-default-ipv4] import-route isis 1
[ASBR-PE1-bgp-default-ipv4] quit

    # Apply the routing policy policy1 to routes advertised to EBGP peer 11.0.0.1.

    [ASBR-PE1-bgp-default] peer 11.0.0.1 as-number 600
[ASBR-PE1-bgp-default] address-family ipv4 unicast
[ASBR-PE1-bgp-default-ipv4] peer 11.0.0.1 enable
[ASBR-PE1-bgp-default-ipv4] peer 11.0.0.1 route-policy policy1 export

    # Enable the capability to advertise labeled routes to EBGP peer 11.0.0.1 and to receive labeled routes from the peer.

    [ASBR-PE1-bgp-default-ipv4] peer 11.0.0.1 label-route-capability
[ASBR-PE1-bgp-default-ipv4] quit
[ASBR-PE1-bgp-default] quit

  4. Configure ASBR-PE 2:

    # Enable IS-IS on ASBR-PE 2.

    <ASBR-PE2> system-view
[ASBR-PE2] isis 1
[ASBR-PE2-isis-1] network-entity 10.222.222.222.222.00
[ASBR-PE2-isis-1] quit

    # Configure the LSR ID, and enable MPLS and LDP.

    [ASBR-PE2] mpls lsr-id 4.4.4.9
[ASBR-PE2] mpls ldp
[ASBR-PE2-ldp] quit

    # Configure VLAN-interface 11, and enable IS-IS, MPLS, and LDP on the interface.

    [ASBR-PE2] interface vlan-interface 11
[ASBR-PE2-Vlan-interface11] ip address 9.1.1.1 255.0.0.0
[ASBR-PE2-Vlan-interface11] isis enable 1
[ASBR-PE2-Vlan-interface11] mpls enable
[ASBR-PE2-Vlan-interface11] mpls ldp enable
[ASBR-PE2-Vlan-interface11] quit

    # Configure Loopback 0, and enable IS-IS on it.

    [ASBR-PE2] interface loopback 0
[ASBR-PE2-LoopBack0] ip address 4.4.4.9 32
[ASBR-PE2-LoopBack0] isis enable 1
[ASBR-PE2-LoopBack0] quit

    # Configure VLAN-interface 12, and enable MPLS on it.

    [ASBR-PE2] interface vlan-interface 12
[ASBR-PE2-Vlan-interface12] ip address 11.0.0.1 255.0.0.0
[ASBR-PE2-Vlan-interface12] mpls enable
[ASBR-PE2-Vlan-interface12] quit

    # Create routing policies.

    [ASBR-PE2] route-policy policy1 permit node 1
[ASBR-PE2-route-policy-policy1-1] apply mpls-label
[ASBR-PE2-route-policy-policy1-1] quit
[ASBR-PE2] route-policy policy2 permit node 1
[ASBR-PE2-route-policy-policy2-1] if-match mpls-label
[ASBR-PE2-route-policy-policy2-1] apply mpls-label
[ASBR-PE2-route-policy-policy2-1] quit

    # Enable BGP on ASBR-PE 2, and enable the capability to advertise labeled routes to IBGP peer 5.5.5.9 and to receive labeled routes from the peer.

    [ASBR-PE2] bgp 600
[ASBR-PE2-bgp-default] peer 5.5.5.9 as-number 600
[ASBR-PE2-bgp-default] peer 5.5.5.9 connect-interface loopback 0
[ASBR-PE2-bgp-default] address-family ipv4 unicast
[ASBR-PE2-bgp-default-ipv4] peer 5.5.5.9 enable
[ASBR-PE2-bgp-default-ipv4] peer 5.5.5.9 label-route-capability

    # Apply routing policy policy2 to routes advertised to IBGP peer 5.5.5.9.

    [ASBR-PE2-bgp-default-ipv4] peer 5.5.5.9 route-policy policy2 export

    # Redistribute routes from IS-IS process 1 into BGP.

    [ASBR-PE2-bgp-default-ipv4] import-route isis 1
[ASBR-PE2-bgp-default-ipv4] quit

    # Apply routing policy policy1 to routes advertised to EBGP peer 11.0.0.2.

    [ASBR-PE2-bgp-default] peer 11.0.0.2 as-number 100
[ASBR-PE2-bgp-default] address-family ipv4 unicast
[ASBR-PE2-bgp-default-ipv4] peer 11.0.0.2 enable
[ASBR-PE2-bgp-default-ipv4] peer 11.0.0.2 route-policy policy1 export

    # Enable the capability to advertise labeled routes to EBGP peer 11.0.0.2 and to receive labeled routes from the peer.

    [ASBR-PE2-bgp-default-ipv4] peer 11.0.0.2 label-route-capability
[ASBR-PE2-bgp-default-ipv4] quit 
[ASBR-PE2-bgp-default] quit

  5. Configure PE 2:

    # Enable IS-IS on PE 2.

    <PE2> system-view
[PE2] isis 1
[PE2-isis-1] network-entity 10.111.111.111.111.00
[PE2-isis-1] quit

    # Configure the LSR ID, and enable MPLS and LDP.

    [PE2] mpls lsr-id 5.5.5.9
[PE2] mpls ldp
[PE2-ldp] quit

    # Configure VLAN-interface 11, and enable IS-IS, MPLS, and LDP on the interface.

    [PE2] interface vlan-interface 11
[PE2-Vlan-interface11] ip address 9.1.1.2 255.0.0.0
[PE2-Vlan-interface11] isis enable 1
[PE2-Vlan-interface11] mpls enable
[PE2-Vlan-interface11] mpls ldp enable
[PE2-Vlan-interface11] quit

    # Configure Loopback 0, and enable IS-IS on it.

    [PE2] interface loopback 0
[PE2-LoopBack0] ip address 5.5.5.9 32
[PE2-LoopBack0] isis enable 1
[PE2-LoopBack0] quit

    # Create VPN instance vpn1, and configure the RD and route target attributes.

    [PE2] ip vpn-instance vpn1
[PE2-vpn-instance-vpn1] route-distinguisher 11:11
[PE2-vpn-instance-vpn1] vpn-target 1:1 2:2 3:3 import-extcommunity
[PE2-vpn-instance-vpn1] vpn-target 3:3 export-extcommunity
[PE2-vpn-instance-vpn1] quit

    # Associate VLAN-interface 12 with VPN instance vpn1, and specify the IP address for the interface.

    [PE2] interface vlan-interface 12
[PE2-Vlan-interface12] ip binding vpn-instance vpn1
[PE2-Vlan-interface12] ip address 20.0.0.1 24
[PE2-Vlan-interface12] quit

    # Enable BGP on PE 2.

    [PE2] bgp 600

    # Enable the capability to advertise labeled routes to IBGP peer 4.4.4.9 and to receive labeled routes from the peer.

    [PE2-bgp-default] peer 4.4.4.9 as-number 600
[PE2-bgp-default] peer 4.4.4.9 connect-interface loopback 0
[PE2-bgp-default] address-family ipv4 unicast
[PE2-bgp-default-ipv4] peer 4.4.4.9 enable
[PE2-bgp-default-ipv4] peer 4.4.4.9 label-route-capability
[PE2-bgp-default-ipv4] quit

    # Configure the maximum hop count from PE 2 to EBGP peer 2.2.2.9 as 10.

    [PE2-bgp-default] peer 2.2.2.9 as-number 100
[PE2-bgp-default] peer 2.2.2.9 connect-interface loopback 0
[PE2-bgp-default] peer 2.2.2.9 ebgp-max-hop 10

    # Configure peer 2.2.2.9 as a VPNv4 peer.

    [PE2-bgp-default] address-family vpnv4
[PE2-bgp-default-vpnv4] peer 2.2.2.9 enable
[PE2-bgp-default-vpnv4] quit

    # Establish an EBGP peer relationship with CE 2, and add the learned BGP routes to the routing table of VPN instance vpn1.

    [PE2-bgp-default] ip vpn-instance vpn1
[PE2-bgp-default-vpn1] peer 20.0.0.2 as-number 65002
[PE2-bgp-default-vpn1] address-family ipv4 unicast
[PE2-bgp-default-ipv4-vpn1] peer 20.0.0.2 enable
[PE2-bgp-default-ipv4-vpn1] quit
[PE2-bgp-default-vpn1] quit
[PE2-bgp-default] quit

  6. Configure CE 2:

    # Configure an IP address for VLAN-interface 12.

    <CE2> system-view
[CE2] interface vlan-interface 12
[CE2-Vlan-interface12] ip address 20.0.0.2 24
[CE2-Vlan-interface12] quit

    # Establish an EBGP peer relationship with PE 2, and redistribute VPN routes.

    [CE2] bgp 65002
[CE2-bgp-default] peer 20.0.0.1 as-number 600
[CE2-bgp-default] address-family ipv4 unicast
[CE2-bgp-default-ipv4] peer 20.0.0.1 enable
[CE2-bgp-default-ipv4] import-route direct
[CE2-bgp-default-ipv4] quit
[CE2-bgp-default] quit

Verifying the configuration

# Execute the display ip routing table command on CE 1 and CE 2 to verify that CE 1 and CE 2 have a route to each other. Verify that CE 1 and CE 2 can ping each other. (Details not shown.)

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