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H3C:SRv6技术白皮书
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H3C:SRv6技术白皮书
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目 录
1 概述·························································································································································· 1
1.1 产生背景 ··············································································································································· 1
1.2 技术优势 ··············································································································································· 1
2 SRv6 基本原理········································································································································· 2
2.1 SRv6 节点 ············································································································································ 2
2.2 SRv6 SID ············································································································································· 2
2.2.1 SID 组成及分类 ·························································································································· 2
2.2.2 SID 附加行为 ····························································································································· 4
2.2.3 Local SID 表 ······························································································································· 4
2.3 SRv6 报文和 SRH ································································································································ 4
2.4 SRv6 报文转发过程 ······························································································································ 6
2.5 G-SRv6 ················································································································································ 6
2.5.1 G-SRv6 简介 ······························································································································ 6
2.5.2 G-SID 格式 ································································································································· 7
2.5.3 G-SRv6 报文 ······························································································································ 7
2.6 IS-IS SRv6 扩展 ··································································································································· 8
2.6.1 IS-IS SRv6 协议原理·················································································································· 8
2.6.2 SRv6 Capabilities sub-TLV ······································································································· 8
2.6.3 Node MSD sub-TLV ·················································································································· 9
2.6.4 SRv6 Locator TLV ··················································································································· 10
2.6.5 SRv6 End SID sub-TLV ··········································································································· 11
2.6.6 SRv6 End.X SID sub-TLV ······································································································· 11
2.6.7 SRv6 LAN End.X SID sub-TLV ······························································································· 12
2.6.8 SRv6 SID Structure Sub-Sub-TLV ·························································································· 13
2.6.9 SRv6 Endpoint Function ·········································································································· 14
2.7 TI-LFA FRR ········································································································································ 15
2.7.1 TI-LFA FRR 简介 ····················································································································· 15
2.7.2 TI-LFA FRR 应用场景 ·············································································································· 15
2.7.3 TI-LFA FRR 相关概念 ·············································································································· 16
2.7.4 TI-LFA FRR 路径计算 ·············································································································· 16
2.7.5 TI-LFA FRR 转发流程 ·············································································································· 17
2.7.6 正切防微环 ······························································································································· 18
2.7.7 回切防微环 ······························································································································· 19
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2.8 BGP-EPE ··········································································································································· 20
2.8.1 BGP-EPE 应用背景 ················································································································· 20
2.8.2 BGP Peer SID ························································································································· 20
2.8.3 BGP-EPE 工作过程 ················································································································· 21
3 SRv6-TE Policy ····································································································································· 22
3.1 SRv6-TE Policy 标识及构成 ··············································································································· 22
3.2 SRv6-TE Policy 创建方式 ··················································································································· 23
3.2.1 通过命令行手工创建 ················································································································ 23
3.2.2 通过 SRv6-TE Policy 路由学习 ································································································ 23
3.2.3 通过 ODN 功能自动创建 ·········································································································· 27
3.3 采用 PCE 计算的路径建立 SID 列表 ··································································································· 27
3.3.1 基本概念 ·································································································································· 27
3.3.2 PCE 路径计算方式 ··················································································································· 28
3.4 SRv6-TE Policy 有效性判断 ··············································································································· 28
3.5 SRv6-TE Policy 引流 ·························································································································· 28
3.6 SRv6-TE Policy 的封装方式 ··············································································································· 30
3.7 SRv6-TE Policy 选路原则 ··················································································································· 30
3.8 SRv6-TE Policy 报文转发过程 ··········································································································· 31
3.9 SRv6-TE Policy CBTS ······················································································································· 32
3.9.1 SRv6-TE Policy CBTS 简介 ····································································································· 32
3.9.2 SRv6-TE Policy CBTS 工作原理 ····························································································· 32
3.9.3 SRv6-TE Policy CBTS 优选规则 ····························································································· 32
3.9.4 SRv6-TE Policy CBTS 示例 ····································································································· 33
3.10 SRv6-TE Policy 与 SBFD 联动 ········································································································· 33
3.11 SRv6-TE Policy 热备份功能 ············································································································· 34
4 SRv6 VPN ············································································································································· 35
4.1 BGP overlay 服务扩展 ························································································································ 35
4.1.1 SRv6 service TLV ···················································································································· 35
4.1.2 SRv6 Service Sub-TLV ··········································································································· 36
4.2 SRv6 VPN 报文转发方式···················································································································· 37
4.2.1 SRv6 BE ·································································································································· 37
4.2.2 SRv6 TE ·································································································································· 37
4.3 IP L3VPN over SRv6·························································································································· 37
4.3.1 IP L3VPN over SRv6 BE 实现过程 ·························································································· 38
4.3.2 IP L3VPN over SRv6 TE 实现过程 ·························································································· 40
4.4 EVPN L3VPN over SRv6 ··················································································································· 41
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4.4.1 EVPN L3VPN over SRv6 BE 实现过程 ··················································································· 42
4.4.2 EVPN L3VPN over SRv6 TE 实现过程 ··················································································· 43
4.5 EVPN VPWS over SRv6 ···················································································································· 45
4.5.1 EVPN VPWS over SRv6 BE 实现过程 ···················································································· 46
4.5.2 EVPN VPWS over SRv6 TE 实现过程 ···················································································· 47
4.5.3 多归属站点 ······························································································································· 49
4.5.4 FRR 功能 ································································································································· 50
4.6 EVPN VPLS over SRv6 ····················································································································· 51
4.6.1 EVPN VPLS over SRv6 BE 实现过程······················································································ 52
4.6.2 EVPN VPLS over SRv6 TE 实现过程 ······················································································ 54
4.6.3 多归属站点 ······························································································································· 56
4.7 公网 IP over SRv6 ······························································································································ 57
4.7.1 公网 IP over SRv6 BE 实现过程 ······························································································ 58
4.7.2 公网 IP over SRv6 TE 实现过程 ······························································································ 59
4.8 SRv6-TE Policy 尾节点保护功能 ········································································································ 61
4.8.1 End.M SID ······························································································································· 62
4.8.2 远端 SRv6 SID ························································································································· 62
4.8.3 路由发布 ·································································································································· 62
4.8.4 报文转发 ·································································································································· 63
5 SRv6 OAM ············································································································································· 63
5.1 SRv6 OAM 协议扩展 ·························································································································· 64
5.1.1 OAM O-bit ································································································································ 64
5.1.2 End.OP SID ····························································································································· 64
5.2 SRv6 SID Ping ··································································································································· 65
5.2.1 逐段检测 ·································································································································· 65
5.2.2 端到端检测 ······························································································································· 66
5.3 SRv6 SID Tracert ······························································································································· 67
5.3.1 Overlay 检测 ···························································································································· 67
5.3.2 非 Overlay 检测 ························································································································ 68
5.4 SRv6-TE Policy Ping ·························································································································· 69
5.5 SRv6-TE Policy Tracert ····················································································································· 70
6 BGP LS for SRv6 ·································································································································· 71
6.1 BGP LS for SRv6 应用场景 ················································································································ 71
6.2 BGP-LS for SRv6 的路由扩展 ············································································································ 71
6.2.1 路由扩展简介 ··························································································································· 71
6.2.2 SRv6 Capabilities TLV ············································································································ 73
iv
6.2.3 SRv6 Node MSD Types ·········································································································· 74
6.2.4 SRv6 End.X SID TLV ·············································································································· 74
6.2.5 SRv6 LAN End.X SID TLV ······································································································ 76
6.2.6 SRv6 Link MSD Types ············································································································ 77
6.2.7 SRv6 Locator TLV ··················································································································· 77
6.2.8 SRv6 SID Information TLV ······································································································ 78
6.2.9 SRv6 Endpoint Behavior TLV ·································································································· 78
6.2.10 SRv6 BGP Peer Node SID TLV ···························································································· 79
6.2.11 SRv6 SID Structure TLV ······································································································· 80
7 参考文献 ················································································································································ 81
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