Segment Routing -もうLDP/RSVPはいらない- Shishio Tsuchiya [email protected] © © 2010 2010 Cisco Cisco and/or and/or its its affiliates. affiliates. All All rights rights reserved. reserved. Cisco Confidential 1 Agenda •  Segment Routing Overview •  Complex of legacy MPLS •  Segment Routing use case •  IETF Status © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 2 サービス・プロバイダーの憂鬱 •  トラフィック・パターンの多様化 •  マルチサービス/共通基盤 •  レベニューモデルの変化 •  パス・スケーラビリティ •  経路爆発 •  管理コスト © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 3 MPLSDN 管理コストと複雑さを増加させずに、より速くサービスを達成する方法とは？ © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 4 Segment Routing 64 draft-previdi-filsfils-isis-segment-routing 67 68 70 •  ネットワークをSegmentで表現する 71 65 69 66 •  SegmentにはNodeとAdjacency2つの要素がある 2adj 4adj •  LDP/RSVPを使わず、直接IGPによりこれらのIDをアドバタイズする •  ネットワークからLDP/RSVPのステートを排除する事が出来る •  現在はdraft-filsfils-rtgwg-segment-routingにてアーキテクチャーを定義 Node Segment 64 67 Adjacency Segment 68 70 64 71 65 69 66 106 105 70 106 67 65 68 102 101 71 69 66 105 105 102 102 102 71 71 71 71 101 101 101 101 data data data data data data data data © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 5 Segment Routing Combination NodeID+AdjID draft-previdi-filsfils-isis-segment-routing 71に行くには67,68 経由で到達 67 105 71 data 105 64 data 71 67 68 data 105 70 71 65 66 71 data 69 data •  Node IDとAdjacency IDの組み合わせも可能 © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 6 Agenda •  Segment Routing Overview •  Complex of legacy MPLS •  Segment Routing use case •  IETF Status © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 7 MPLS OAM Requirement Control Plane! IP Routing Protocols OSPF/ISIS/BGP/EIGRP/RIP IP Routing Table" Label Information Base (LIB)" Data Plane! CEF" Switching" MPLS Label " Control Protocol" TDP/LDP/RSVP/CR-LDP/BGP Forwarding Information Base (FIB)" Label Forwarding Information Base (LFIB)" •  コントロールプレーンとデータプレーンを分離 •  データプレーンを確認するための新しいOAMツール(RFC4379)が必要に © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 8 MPLS LDP IGP Synchronization(RFC5443) LFIB LFIB LFIB LFIB FIB FIB FIB FIB LFIB LFIB FIB FIB 65535 LFIB LFIB LFIB LFIB FIB FIB FIB FIB •  2つ以上のコントロールプレーン/データプレーンを使う為に相互での矛盾が起こりうる •  LDP Stateの監視を行いMax Metricでコントロールをする © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 9 Discovery of MPLS LSR TE Mesh Membership (RFC4972) Blue is Voice,12 tunnels Red is Video,12 tunnels 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | mesh-group-number 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Tail-end IPv4 address 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Name length | Tail-end name 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ // // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | mesh-group-number n | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Tail-end IPv4 address n | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Name length | Tail-end name n | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ •  RSVPのパスセットアップに必要なTEDBの為にOSPF/ISISを拡張(RFC3630/RFC5305) •  ノードがどのMesh Groupに入るかの伝播も拡張し、設定負荷などを軽減 © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 10 まとめ •  コントロールプレーンとデータプレーンが大きく離れているので、追加でOAMが必要に •  コントロールプレーンが複数あるので、監視する仕組みが必要に •  多くの設定を要する為に、設定情報を分散させる仕組みが必要に © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 11 Agenda •  Segment Routing Overview •  Complex of legacy MPLS •  Segment Routing use case •  IETF Status © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 12 Applicability Simplicity/Scalable TE PE PE •  Simplicity VPNサービスの為にはPEのNode IDを知ってるのみで良い IGP/LDPのSyncなどを気にする必要が無くなる一つのプロトコルのみの運用 •  Scalable TE RSVP TEでフルメッシュの運用をすると、N-1のHead/TailおよびN(N-1)/2 midpoint LSP の管理が必要 SRではStateを管理する必要が無い。State in the packet © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 13 Applicability Simple Disjointness/CoS Based TE •  Simple Disjointness 品質の厳しい顧客にはプライマリ/セカンダリが互いに分離したパスが必要になる。 SRであればNode IDをStackする事でコントロールが可能 •  CoS Based TE データは回線コストの安いUS経由/VoIPは低遅延のロシア経由など品質に応じたトラフィックエンジニアリングも実施可能 © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 14 Applicability Segment Routing in Software Defined Networks (SR-SDN) FULL 68 9,7 6 , 8 {6 0} 70 69 帯域の問題は無し •  ネットワークがシンプルなので、パスセットアップも非常に簡単になる © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 15 Agenda •  Segment Routing Overview •  Complex of legacy MPLS •  Segment Routing use case •  IETF Status © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 16 Segment Routing IETF Status •  IETF 87 - Berlin, Germany Stacked Tunnels for Source Routing (STATUS) BOF http://www.ietf.org/proceedings/87/status.html •  IETF 88 - Vancouver, BC, Canada "Source Packet Routing in Networking" (spring) WG https://datatracker.ietf.org/doc/charter-ietf-spring/ Milestones: ü  ü  ü  ü  High Level Architecture MPLS Architecture/IPv6 Architecture Use case OAM/Inter-work/interop report etc.. © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 17 IETF Activity http://tools.ietf.org/wg/spring/ •  SRアークテクチャー　draft-filsfils-rtgwg-segment-routing •  Use case draft-filsfils-rtgwg-segment-routing-use-cases •  SRの為のISIS拡張 draft-previdi-isis-segment-routing-extensions •  SRの為のOSPF拡張 draft-psenak-ospf-segment-routing-extensions draft-psenak-ospf-segment-routing-ospfv3-extension •  SR with MPLS draft-filsfils-spring-segment-routing-mpls draft-filsfils-spring-segment-routing-ldp-interop draft-kumar-mpls-spring-lsp-ping © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 18 OSPF Extended Prefix TLV draft-psenak-ospf-segment-routing-extensions •  0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type(1) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Route Type | Prefix Length | AF(0) | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Address Prefix (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sub-TLVs (variable) | +-+ | | OSPFルートタイプ: 0 - unspecified 1 - intra-area 3 - inter-area 5 - external 7 - NSSA external Opaque TLVを用いてSIDを伝播 AF:0 IPv4 unicast © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 19 Prefix SID Sub-TLVdraft-psenak-ospf-segment-routing-extensions 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type(2) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | MT-ID | Algorithm | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Index | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 0 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |N|P|M| | +-+-+-+-+-+-+-+-+ •  N-Flag: Node-SID flag.NodeSIDかどうかを示す。 •  P-Flag: no-PHP flag.セットしてあればPHPをしてはならない •  M-Flag: Mapping Server Flag.セットしてあればMapping Serverによりアドバタイズされた © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 20 SID/Label Binding sub-TLV draft-psenak-ospf-segment-routing-extensions 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | MT-ID | Weight | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sub-TLVs (variable) | +-+ | | 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ M-Flag: IP FRR/MPLS FRRによる保護されている |M| | Weightはロードバランスに使用される +-+-+-+-+-+-+-+-+ •  Prefixへのパスを示す •  SubTLVにはERO Metric sub-TLV/IPv4 ERO sub-TLV © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 21 ERO Metric sub-TLV draft-psenak-ospf-segment-routing-extensions 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type(8) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Metric (4 octets) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| •  Metric Source/Destinationのコスト比較の為に使用する © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 22 IPv4 ERO subTLV draft-psenak-ospf-segment-routing-extensions 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type(4) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | IPv4 Address (4 octets) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ L-bit:ビットが立っているとloose/無ければstrict |L| | +-+-+-+-+-+-+-+-+ •  Backup ERO/unnumbered ERO subTLVなどがある © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 23 •  Images available for ASR9000, CRS and XR12000 •  Prototype supports MPLS data plane Node segment id IS-IS •  Implementation based on 4.3.1 code •  Available for customer lab use •  CLI not final © 2011 Cisco and/or its affiliates. All rights reserved. – [email protected] Cisco Confidential 24 Nodal-id configuration router isis abc net 47.0000.0000.0000.1111.00 address-family ipv4 unicast 1 2 3 4 metric-style wide ! address-family ipv6 unicast ! interface Loopback0 passive address-family ipv4 unicast nodal-sid sid-value 16001 ! address-family ipv6 unicast nodal-sid sid-value 16901 ! © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 25 show isis database RP/0/RSP0/CPU0:ASR9k-1#sh isis database verbose IS-IS abc (Level-1) Link State Database LSPID LSP Seq Num ASR9k-1.00-00 * 0x00000057 LSP Checksum LSP Holdtime 0x9e4e 675 ATT/P/OL 1 2 3 4 0/0/0 Area Address: 47.0000 NLPID: 0xcc NLPID: 0x8e MT: Standard (IPv4 Unicast) MT: IPv6 Unicast Hostname: ASR9k-1 IP Address: 10.1.255.1 0/0/0 IPv6 Address: 2001:db8:ffff::1 Metric: 10 IS-Extended ASR9k-2.00 Metric: 10 IP-Extended 10.1.13.0/24 Metric: 0 IP-Extended 10.1.255.1/32 Nodal-SID: 16001 PHP-off:0 Ext:0 © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 26 show mpls fowarding RP/0/RSP0/CPU0:ASR9k-1#sh mpls for Local Outgoing Prefix Outgoing Label Label or ID Interface Next Hop Bytes Switched 1 2 3 4 ------ ----------- ------------------ ------------ --------------- -----------16001 Aggregate default: Per-VRF Aggr[V] \ default 0 0 16002 Pop No ID Te0/0/0/0 10.1.12.2 752 16003 Pop No ID Te0/0/0/1 10.1.13.3 0 16004 16004 No ID Te0/0/0/0 10.1.12.2 0 16004 No ID Te0/0/0/1 10.1.13.3 0 16902  Pop No ID Te0/0/0/0 fe80::6e9c:edff:fe30:de0 \ 1112 16903  Pop No ID Te0/0/0/1 fe80::4255:39ff:fe7f:fbe9 \ 0 16904  16904 No ID Te0/0/0/0 fe80::6e9c:edff:fe30:de0 16904 No ID Te0/0/0/1 fe80::4255:39ff:fe7f:fbe9 © 2010 Cisco and/or its affiliates. All rights reserved. \ 0 \ 0 Cisco Confidential 27 show cef x.x.x.x RP/0/RSP0/CPU0:ASR9k-1#sh cef 10.1.255.4 Wed Jun 26 15:34:16.877 UTC 1 2 3 4 10.1.255.4/32, version 10515396, internal 0x4004001 (ptr 0x7630ff20) [1], 0x0 (0x71202dd8), 0x450 (0x7665c050) Updated Jun 26 15:26:10.750 remote adjacency to TenGigE0/0/0/0 Prefix Len 32, traffic index 0, precedence n/a, priority 1 via 10.1.12.2, TenGigE0/0/0/0, 8 dependencies, weight 0, class 0 [flags 0x0] path-idx 0 [0x72372224 0x0] next hop 10.1.12.2 remote adjacency local label 16004 labels imposed {16004} via 10.1.13.3, TenGigE0/0/0/1, 9 dependencies, weight 0, class 0 [flags 0x0] path-idx 1 [0x723721c8 0x0] next hop 10.1.13.3 remote adjacency local label 16004 © 2010 Cisco and/or its affiliates. All rights reserved. labels imposed {16004} Cisco Confidential 28 まとめ •  Segment RoutingではOSPF/ISISにて直接データプレーン情報をアドバタイズする事で複雑さを回避/ステータスの管理を軽減する •  シンプルにする事により、アプリケーションとの連動をしやすいコアネットワークを構築可能に © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 29 Thank you.