Configuring IPv6 Tunneling over IPv4 MPLS

To configure IPv6 tunneling over MPLS:

1. On PE 1, configure both an IPv4 and an IPv6 interface toward the CE router. Use an IPv4-compatible IPv6 address.

   host1(config)#interface atm2/0.1

   host1(config)#atm pvc 1 0 1 aal5snap

   host1(config)#ip address 11.19.1.1 255.255.255.0

   host1(config)#ipv6 address ::11.19.1.1/126

2. On PE 1, configure an IPv4 interface facing the core.

   Note: For forwarding to work, you must configure at least one IPv6 interface on each line module where MPLS-encapsulated IPv6 traffic is expected. You can easily accomplish this by also configuring an IPv6 address on the core-facing interface.

   host1(config)#interface atm3/0.1

   host1(config)#atm pvc 30 0 30 aal5snap

   host1(config)#ip address 10.10.10.1 255.255.255.0

   host1(config)#ip address ::10.10.10.1/120

3. On PE 1, configure a loopback interface.

   host1(config)#interface loopback 1

   host1(config)#ip address 1.1.1.1 255.255.255.0

4. On PE 1, configure an IPv4 IGP and an MPLS signaling protocol in the core.
5. On PE 1, set up a base tunnel, or verify that one exists between the loopback addresses on the PE routers.
6. On PE 1, configure MP-BGP.
   1. Enable BGP.

      host1(config)#router bgp 100

   2. Configure the MP-BGP CE and PE neighbors.

      host1(config-router)#neighbor 11.19.1.2 remote-as 65000

      host1(config-router)#neighbor 2.2.2.2 remote-as 100

   3. Activate the neighbors in the IPv6 address-family.

      host1(config-router)#address-family ipv6 unicast

      host1(config-router-af)#neighbor 11.19.1.2 activate

      host1(config-router-af)#neighbor 2.2.2.2 activate

   4. Configure the MP-BGP PE neighbor to send labeled IPv6 prefixes.

      host1(config-router-af)#neighbor 2.2.2.2 send-label

      host1(config-router-af)#neighbor 2.2.2.2 update-source loopback 1

      host1(config-router-af)#neighbor 2.2.2.2 next-hop-self

      host1(config-router-af)#exit-address-family

7. Configure the P router with an IPv4 IGP and an MPLS signaling protocol.
8. Configure the PE 2 router as you did PE 1 in Steps 1–6.
9. Configure the CE 1 and CE 2 routers.
   1. Configure both an IPv4 and an IPv6 interface toward the PE router. Use an IPv4-compatible IPv6 address.
   2. Configure an MP-BGP session to the PE router over TCPv4, and activate the IPv6 unicast address family.

neighbor send-label

• Use to cause an MP-BGP neighbor to distribute an MPLS label with its IPv6 prefix advertisements.
• If you specify a BGP peer group by using the peer-group-name argument, all the members of the peer group inherit the characteristic configured with this command. You cannot override the characteristic for a specific member of the peer group.
• Example

  host1(config-router-af)#neighbor 192.168.5.1 send-label

• Use the no version to halt distribution of the MPLS label with route advertisements.
• See neighbor send-label.

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