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6. 使用示例 (Usage Examples)

6.1. IPv4 over IPv6 Core​

本文档定义的 extensions 可按 [RFC5565] 中讨论的方式, 用于通过 IPv6 backbone 互连 IPv4 islands. 在该应用中, Address Family Border Routers (AFBRs; 如 [RFC4925] 中定义) 在 MP_REACH_NLRI 中通告 IPv4 NLRI 以及 IPv6 next hop.

MP_REACH_NLRI 编码如下:

  • AFI = 1

  • SAFI = 1

  • Length of Next Hop Address field = 16 (or 32)

  • Next Hop Address = IPv6 address of the next hop

  • NLRI = IPv4 routes

在 BGP Capability Advertisement 期间, PE routers 会在 Capabilities Optional Parameter 中包含以下 fields:

  • Capability Code set to "Extended Next Hop Encoding"

  • Capability Value containing

6.2. IPv4 VPN Unicast over IPv6 Core​

本文档定义的 extensions 可用于支持通过 IPv6 backbone 承载 IPv4 VPNs. 在该应用中, PE routers 会在 MP_REACH_NLRI 中通告 VPN-IPv4 NLRI 以及 IPv6 next hop.

MP_REACH_NLRI 编码如下:

  • AFI = 1

  • SAFI = 128

  • Length of Next Hop Address field = 24 (or 48)

  • Next Hop Address = VPN-IPv6 address of a next hop whose RD is set to zero

  • NLRI = IPv4-VPN routes

在 BGP Capability Advertisement 期间, PE routers 会在 Capabilities Optional Parameter 中包含以下 fields:

  • Capability Code set to "Extended Next Hop Encoding"

  • Capability Value containing

6.3. IPv4 VPN Multicast over IPv6 Core​

本文档定义的 extensions 可用于支持通过 IPv6 backbone 承载 IPv4 multicast VPNs. 在该应用中, PE routers 会在 MP_REACH_NLRI 中通告 VPN-IPv4 NLRI 以及 IPv6 next hop.

MP_REACH_NLRI 编码如下:

  • AFI = 1

  • SAFI = 129

  • Length of Next Hop Address field = 24 (or 48)

  • Next Hop Address = VPN-IPv6 address of a next hop whose RD is set to zero

  • NLRI = IPv4-VPN routes

在 BGP Capability Advertisement 期间, PE routers 会在 Capabilities Optional Parameter 中包含以下 fields:

  • Capability Code set to "Extended Next Hop Encoding"

  • Capability Value containing

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