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IPv6 application in 5G bearer network
Source:Original | Author:Calio Huang of C&T RF Antennas Inc | Publish time: 2019-09-14 | 1295 Views | Share:

With the exhaustion of global IPv4 addresses, all operators cannot apply to the IPv4 address pool of the public network. All countries have adopted IPv6 as the direction of the next-generation Internet, and China has also clearly accelerated the strategy of building IPv6-based next-generation Internet.

Driven by national policies, the domestic IPv6 industry chain has accelerated its maturity, and the development of terminals and service platforms has also accelerated the pace of IPv6 network construction. As the carrier's basic network, the bearer network is also facing the demand for IPv6 evolution.

VPN supports IPv6

With the IPv4/IPv6 dual-stacking of the interface carried by the base station and the core network, the bearer network needs to support the 6vPE to provide a dual-stack VPN, which satisfies the evolution of the IPv6 on the customer side. 6vPE superimposes IPv6 VPN on the IPv4 MPLS network. The operator only needs to upgrade the IPv6 and IPv6 dual stacks on the ingress PE and egress PE of the service to support the IPv6 requirements of the service. The intermediate node can still be an IPv4 MPLS network. The 6vPE control plane protocol is also MP-BGP. By adding a new address family to advertise IPv6 routes between BGP neighbors, you can build an L3VPN that supports IPv6.

The dual-stack VPN can support both the 4G base station and the newly built 5G base station bearer. The user side provides dual-stack access based on the existing model. For the 4G base station, only the IPv4 address is assigned, and the VPN sub-interface is used to access the VPN. For the 5G base station supporting IPv6, the IPv4 and IPv6 addresses are allocated, and two access modes are supported. You can configure IPv4/IPv6 addresses on the same VLAN sub-interface or IPv4/IPv6 addresses on different VLAN sub-interfaces. The first approach is recommended to simplify the VLAN configuration. Similarly, the core network also needs to support IPv4 and IPv6 dual stacks.

Within the VPN, the 5G base station communicates with the inventory 4G base station using the IPv4 address, communicates with the core network using the IPv6 address, and the 4G base station still communicates with the core network using the IPv4 address. The dual-stack VPN is simple to implement and can avoid complex conversion between IPv4 and IPv6 while meeting the service requirements.