1. IPv6 VPN Based Address Format draft-lee-l3vpn-ipv6-vpn-00.txt
Bin
Hongfei
IETF 64, Nov. 2005

2. Motivation
A new L3 VPN solution based on structure of IPv6 addresses. The target of solution reduce payload of packet.
In IPv6 addresses there are enough bits available to allow us to embed a VPN site ID, so that no encapsulation overhead is required to achieve isolation between VPNs
8 bytes could saved between IPv6 VPN and MPLS VPN
Pure IPv6 Network could support L3 VPN
IETF 64, Nov. 2005

3. Scenario of IPv6 VPN Network
Site2
VPN1
Site1
SE2
SE1
Public IPv6
Network
SE3
VPN2
Site1
VPN1
Site2
SE : Site Edge router
IETF 64, Nov. 2005

4. Two Kinds of IPv6 VPN Address (1)
VPN-Local Address(VLA)
VPN-Local Address is similar to the site-local address.
Valid only within VPN
Perfix of VPN-Local Address should be sent by routing protocol to other site of this VPN
First kind of VPN-Local address structure is this figure. The other VPN-Local address structure is ULA which defined in draft-ietf-ipv6-unique-local-addr-09.txt(RFC4193)
reserved
Subnet ID
Interface ID
10 bits
38 bits
16 bits
64 bits
IETF 64, Nov. 2005

5. Two Kinds of IPv6 VPN Address (2)
VPN-Global Address(VGA)
The VPN-Global Address is used for transmitting packet of VPN on the public IPv6 network
VPN-Global addresses are different from global IPv6 addresses. Router must prevent VPN-Global addresses of different VPNs from mutual access.
010
VPN site ID
Subnet ID
Interface ID
3 bits
45 bits
16 bits
64 bits
VPN ID
Site ID
16 bits
29 bits
IETF 64, Nov. 2005

6. Mapping between VPN-Global address and VPN-Local Address
reserved
Subnet ID
Interface ID
Site Network
SP Network
010
VPN site ID
Subnet ID
Interface ID
VPN-Global address
IETF 64, Nov. 2005

7. VPN Packet Forwarding Process
Src: VLA
Des:VLA
Translate between VLA and VGA
VPN2
Site2
VPN1
Site1
Src: VGA
Des:VGA
SE2
SE1
Public IPv6
Network
SE3
VPN2
Site1
VPN1
Site2
Src: VGA
Des:VGA
Src: VLA
Des:VLA
Translate between VLA and VGA
IETF 64, Nov. 2005

8. Other considerations Multicast in section 2.1/2.2/5
Internet Access in section 6
Interconnecting with IPv4 Sites in section 8
IETF 64, Nov. 2005