R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

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Tunneling
Tunneling is an encapsulation technology that utilizes one network protocol to encapsulate packets of
another network protocol and transfer them over the network. For more information about tunneling, see
"Configuring tunneling."
NAT-PT
Network Address Translation – Protocol Translation (NAT-PT) is usually applied on a device between IPv4
and IPv6 networks to translate between IPv4 and IPv6 packets, allowing communication between IPv4
and IPv6 nodes. It performs IP address translation, and according to different protocols, performs
semantic translation for packets. This technology is only suitable for communication between a pure IPv4
node and a pure IPv6 node. For more information about NAT-PT, see "Configuring NAT-PT."
6PE
6PE is a transition technology by which Internet service providers (ISPs) can use existing IPv4 backbone
networks to allow communications between isolated IPv6 networks.
6PE adds labels to the IPv6 routing information about customer networks and advertises the information
into the IPv4 backbone network over Internal Border Gateway Protocol (IBGP) sessions. IPv6 packets are
labeled and forwarded over tunnels on the backbone network. The tunnels can be GRE tunnels or MPLS
LSPs.
Figure 60 Network diagram
When an ISP wants to utilize the existing IPv4/MPLS network to provide IPv6 traffic switching capability
through MPLS, only the PE routers need to be upgraded, so 6PE is a highly efficient solution. In addition,
the operation risk of 6PE is very low.
For more information or configuration related to 6PE, see Layer 3—IP Routing Configuration Guide.
Protocols and standards
Protocols and standards related to IPv6 include:
• R F C 1881, IPv6 Address Allocation Management
• RFC 1887, An Architecture for IPv6 Unicast Address Allocation
• RFC 1981, Path MTU Discovery for IP version 6
• RFC 2375, IPv6 Multicast Address Assignments
• RFC 2460, Internet Protocol, Version 6 (IPv6) Specification
• RFC 2464, Transmission of IPv6 Packets over Ethernet Networks
• RFC 2526, Reserved IPv6 Subnet Anycast Addresses
• RFC 3307, Allocation Guidelines for IPv6 Multicast Addresses
• R F C 3 513 , Internet Protocol Version 6 (IPv6) Addressing Architecture
IPv6 network
Customer site
CE
6PE 6PE
P
IPv4/MPLS network
IBGP
CE
IPv6 network
Customer site