IPv6 VPN Based Address Format draft-lee-l3vpn-ipv6-vpn-00.txt

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IPv6 VPN Based Address Format draft-lee-l3vpn-ipv
6-vpn-00.txt

• Bin Lee(l.b_at_huawei.com)
• Hongfei Chen(chenhongfei_at_huawei.com)

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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

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Scenario of IPv6 VPN Network
SE2
SE1
Public IPv6 Network
SE3
SE Site Edge router
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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)

1111111011
reserved
Subnet ID
Interface ID
10 bits
38 bits
16 bits
64 bits
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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
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Mapping between VPN-Global address and VPN-Local
Address
VPN-Local Address
1111111011
reserved
Subnet ID
Interface ID
Site Network
SP Network
010
VPN site ID
Subnet ID
Interface ID
VPN-Global address
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VPN Packet Forwarding Process
Src VLA DesVLA
Translate between VLA and VGA
Src VGA DesVGA
SE2
SE1
SE3
Src VGA DesVGA
Src VLA DesVLA
Translate between VLA and VGA
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Other considerations

• Multicast in section 2.1/2.2/5
• Internet Access in section 6
• Interconnecting with IPv4 Sites in section 8