Configuring BGP4+ 6PE
BGP4+ 6PE enables separated IPv6 networks to communicate using the MPLS tunneling technology.
Usage Scenario
6PE enables IPv6 networks separated by IPv4/MPLS networks to communicate.
Separated IPv6 networks can be connected using various tunneling techniques. A 6PE tunnel is established on Internet Service Provider's (ISP's) PEs that support the IPv4/IPv6 dual stack. The 6PE tunnel identifies IPv6 routes by label assigned by the Multiprotocol Border Gateway Protocol (MP-BGP), and implements IPv6 forwarding using LSPs between PEs.
As shown in Figure 1, the IPv6 network where CE1 and CE2 reside are separated by an IPv4/MPLS network. Configuring 6PE enables CE1 and CE2 to communicate across the IPv4 network.
Pre-configuration Tasks
Before configuring BGP4+ 6PE, complete the following tasks:
Connect interfaces and setting parameters for the interfaces to ensure that the physical-layer status of the interfaces is Up.
Configure the link layer protocol parameters for interfaces.
Ensure that routes on the IPv4/MPLS backbone network are reachable.
- Configuring the IPv4/IPv6 Dual Stack
- The IPv4/IPv6 dual stack needs to be configured on the router at the edge of an IPv6 network and an IPv4 network.
- Configuring an LDP LSP on an IPv4 Network
- An LDP LSP is configured on an IPv4/MPLS backbone network to forward IPv6 packets.
- Establishing a 6PE Peer Relationship Between PEs
- 6PE peers can exchange IPv6 routes learned from their attached CEs.
- (Optional) Enabling 6PE Routes Sharing the Explicit Null Label
- By enabling IPv6 provider edge (6PE) routes sharing the explicit null label, you can save label resources on 6PE devices.
- Configuring Route Exchange Between a PE and a CE
- An IPv6 routing protocol needs to be configured on a PE and a CE to enable them to learn IPv6 routes from each other.
- Verifying the Configuration of BGP4+ 6PE
- After configuring BGP4+ 6PE, check whether CEs can learn routes to each other.