BGP Dissemination of Network Virtualization Overlays (NVO3) Flow Specification Rules
draft-ietf-idr-flowspec-nvo3-02

INTERNET-DRAFT                                           Donald Eastlake
Intended Status: Proposed Standard                            Weiguo Hao
                                                          Shunwan Zhuang
                                                              Zhenbin Li
                                                     Huawei Technologies
                                                                 Rong Gu
                                                             China Mobil
Expires: September 20, 2018                               March 21, 2018

                          BGP Dissemination of
Network Virtualization Overlays (NVO3) Flow Specification Rules
                 <draft-ietf-idr-flowspec-nvo3-02.txt>

Abstract
   This draft specifies a new subset of component types to support the
   (Network Virtualization Overlays (NVO3) flow-spec application.

Status of This Document

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

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Table of Contents

      1. Introduction............................................3
      1.1 Terminology............................................5

      2. NVO3 Flow Specification Encoding........................6

      3. NVO3 Flow Specification Traffic Actions.................8

      4. Security Considerations.................................8
      5. IANA Considerations.....................................8

      Normative References.......................................9
      Informative References.....................................9

      Acknowledgments...........................................10
      Authors' Addresses........................................10

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1. Introduction

   BGP Flow-spec is an extension to BGP that supports the dissemination
   of traffic flow specification rules.  It uses the BGP Control Plane
   to simplify the distribution of ACLs and allows new filter rules to
   be injected to all BGP peers simultaneously without changing router
   configuration. A typical application of BGP Flow-spec is to automate
   the distribution of traffic filter lists to routers for Distributed
   Denial of Service (DDOS) mitigation.

   [RFC5575] defines a new BGP Network Layer Reachability Information
   (NLRI) format used to distribute traffic flow specification rules.
   NLRI (AFI=1, SAFI=133) is for IPv4 unicast filtering. NLRI (AFI=1,
   SAFI=134) is for BGP/MPLS VPN filtering. [IPv6-FlowSpec] and [Layer2-
   FlowSpec] extend the flow-spec rules for IPv6 and layer 2 Ethernet
   packets respectively. All these previous flow specifications match
   only single layer IP/Ethernet information fields like
   source/destination MAC, source/destination IP prefix, protocol type,
   ports, and the like.

   In the cloud computing era, multi-tenancy has become a core
   requirement for data centers. Since Network Virtualization Overlays
   (NVO3) can satisfy multi-tenancy key requirements, this technology is
   being deployed in an increasing number of cloud data center networks.
   NVO3 is an overlay technology and VXLAN [RFC7348] and NVGRE [RFC7367]
   are two typical NVO3 encapsulations. GENEVE [GENEVE], GUE [GUE] and
   GPE [GPE] are three emerging NVO3 encapsulations. Because it is an
   overlay technology, flow specification matching on an inner header as
   well as the outer header, as specified below, is needed.

                                +--+
                                |CE|
                                +--+
                                  |
                               +----+
                          +----| PE |----+
              +---------+ |    +----+    | +---------+
      +----+  |        +---+            +---+        |  +----+
      |NVE1|--|        |   |            |   |        |--|NVE3|
      +----+  |        |GW1|            |GW3|        |  +----+
              |        +---+            +---+        |
              |  NVO-1   |      MPLS      |   NVO-2  |
              |        +---+            +---+        |
              |        |   |            |   |        |
      +----+  |        |GW2|            |GW4|        |  +----+
      |NVE2|--|        +---+            +---+        |--|NVE4|
      +----+  +---------+ |              | +---------+  +----+
                          +--------------+

                Figure 1. NVO3 Data Center Interconnection

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   The MPLS L2/L3 VPN in the WAN network can be used for NVO3 based data
   center network interconnection. When the Data Center (DC) and the WAN
   are operated by the same administrative entity, the Service Provider
   can decide to integrate the gateway (GW) and WAN Edge PE functions in
   the same router for obvious capital and operational cost saving
   reasons. This is illustrated in Figure 1. There are two
   interconnection solutions as follows:

   1. End-to-end NVO3 tunnel across different data centers: NVE1 perform
      NVO3 encapsulation for DC interconnection with NVE3, the
      destination VTEP IP is NVE3's IP. The GW doesn't perform NVO3
      tunnel termination.  The DC interconnect WAN is pure an underlay
      network.

   2. Segmented NVO3 tunnels across different data centers: NVE1 doesn't
      perform end-to-end NVO3 encapsulation to NVE3 for DC
      interconnection.  The GW performs NVO3 tunnel encapsulation
      termination, and then transmits the inner original traffic through
      MPLS network to the peer data center GW. The peer data center GW
      terminates MPLS encapsulation, and then performs NVO3
      encapsulation to transmit the traffic to the local NVE3.

   In the first solution, to differentiate bandwidth and QOS among
   different tenants or applications, different TE tunnels in the WAN
   network will be used to carry the end-to-end NVO3 encapsulation
   traffic using VN ID, NVO3 outer header DSCP and etc as traffic
   classification match part. The BGP Flow-spec protocol can be used to
   set the traffic classification on all GWs simultaneously.

   In the second solution, a centralized BGP speaker can be deployed for
   DDOS mitigation in the WAN network. When the analyzer detects
   abnormal traffic, it will automatically generate Flow-spec rules and
   distribute them to each GW through BGP Flow-spec protocol, the match
   part should include matching on inner or outer L2/L3 layer or NVO3
   headers.

   In summary, the Flow specification match part on the GW/PE should
   include inner layer 2 Ethernet header, inner layer 3 IP header, outer
   layer 2 Ethernet header, outer layer 3 IP header, and/or NVO3 header
   information. Because the current flow-spec matching facilities lack a
   layer indicator and NVO3 header information, they can't be used
   directly for the traffic filtering based on NVO3 header or on a
   specified layer header directly. This draft specifies a new subset of
   component types to support the NVO3 flow-spec application.

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1.1 Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   The reader is assumed to be familiar with BGP and NVO3 terminology.
   The following terms and acronyms are used in this document with the
   meaning indicated:

   DC - Data Center

   DDOS - Distributed Denial of Service (Attack).

   GW - gateway

   VN - virtual network

   WAN - wide area network

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2. NVO3 Flow Specification Encoding

   The current Flow-spec rules can only recognize flows based on the
   outer layer header of NVO3 encapsulation data packets. To enable
   traffic filtering based on an NVO3 header and inner header of NVO3
   packets, a new component type acting as a delimiter is introduced.
   The delimiter type is used to specify the boundary between the inner
   and outer layer component types for NVO3 data packets. All the
   component types defined in [RFC5575], [IPv6-FlowSpec],
   [Layer2-FlowSpec], and the like can be used between two delimiters.

   Because the NVO3 outer layer address normally belongs to a public
   network, the "Flow Specification" NLRI for the outer layer header
   doesn't need to include a Route Distinguisher field (8 bytes). If the
   outer layer address belongs to a VPN, the NLRI format for the outer
   header should consist of a fixed-length Route Distinguisher field (8
   bytes) corresponding to the VPN. This Route Distinguisher is followed
   by the detail flow specifications for the outer layer.

   The VN ID is the identification for each tenant network. The "Flow
   Specification" NLRI for an NVO3 header part should always include VN
   ID field but a Route Distinguisher field doesn't need to be included.

   The inner layer MAC/IP address is always associated with a VN ID.
   Thus the NLRI format for the inner header should consist of a fixed-
   length VN ID field (4 bytes). The VN ID is followed by the detailed
   flow specifications for the inner layer. The NLRI length field shall
   include both the 4 bytes of the VN ID as well as the subsequent flow
   specification. In the NVO3 terminating into a VPN scenario, if
   multiple access VN IDs map to one VPN instance, one shared VN ID can
   be carried in the Flow-Spec rule to enforce the rule to the entire
   VPN instance and the share VN ID and VPN correspondence should be
   configured on each VPN PE beforehand. In this case, the function of
   the layer3 VN ID is the same as a Route Distinguisher: it acts as the
   identification of the VPN instance.

   This document specifies the following Flow-Spec Component Types for
   use with NVO3 flows:

   Type TBD1 - Delimiter type
      Encoding: <type (1 octet), length (1 octet), Value>.

         When this delimiter type is present, it indicates the component
         types for the next layer of NVO3 header fields immediately
         follow. At the same time, it indicates the end of the component
         types belonging to the previous layer of header fields.

         The value field defines encapsulation type and is encoded as:

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                        | 0   1   2   3   4   5   6   7 |
                        +---+---+---+---+---+---+---+---+
                        |          Encap Type           |
                        +---+---+---+---+---+---+---+---+
                        | I | O |        Resv           |
                        +---+---+---+---+---+---+---+---+

         This document defines the following Encap types:

            - VXLAN: Tunnel Type = 0

            - NVGRE: Tunnel Type = 1

         I: If I is set to one, it indicates the component types for the
         inner layer of NVO3 headers immediately follow.

         O: If O is set to one, it indicates the component types for the
         outer layer of NVO3 headers immediately follow.

For NVO3 header part, the following additional component types are
   introduced.

Type TBD2 - VN ID

      Encoding: <type (1 octet), [op, value]+>.

      Defines a list of {operation, value} pairs used to match 24-bit VN
      ID which is used as tenant identification in NVO3 network. For
      NVGRE encapsulation, the VN ID is equivalent to VSID. Values are
      encoded as 1- to 3-byte quantities.

Type TBD3 - Flow ID

      Encoding: <type (1 octet), [op, value]+>

      Defines a list of {operation, value} pairs used to match 8-bit
      Flow ID fields which are only useful for NVGRE encapsulation.
      Values are encoded as 1-byte quantity.

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3. NVO3 Flow Specification Traffic Actions

   The current traffic filtering actions are used for NVO3 encapsulation
   traffic. For Traffic Marking, only the DSCP in the outer header can
   be modified.

4. Security Considerations

   No new security issues are introduced to the BGP protocol by this
   specification.

5. IANA Considerations

   IANA is requested to assign three new values in the "Flow Spec
   Component Types" registry as follows:

      Type    Name            Reference
      ----   --------------   ---------
      TBD1   Delimiter type   [this document]
      TBD2   VN ID            [this document]
      TBD3   Flow ID          [this document]

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Normative References

   [RFC2119] - Bradner, S., "Key words for use in RFCs to Indicate
         Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119,
         March 1997, <https://www.rfc-editor.org/info/rfc2119>.

   [RFC5575] - Marques, P., Sheth, N., Raszuk, R., Greene, B., Mauch,
         J., and D. McPherson, "Dissemination of Flow Specification
         Rules", RFC 5575, DOI 10.17487/RFC5575, August 2009,
         <https://www.rfc-editor.org/info/rfc5575>.

   [RFC8174] - [RFC8174] - Leiba, B., "Ambiguity of Uppercase vs
         Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI
         10.17487/RFC8174, May 2017, <https://www.rfc-
         editor.org/info/rfc8174>.

   [GENEVE] - J. Gross, T. Sridhar, etc, "Geneve: Generic Network
         Virtualization Encapsulation", draft-ietf-nvo3-geneve, work in
         progress.

   [GUE] - T. Herbert, L. Yong, O. Zia, "Generic UDP Encapsulation",
         draft-ietf-nvo3-gue, work in progress.

Informative References

   [RFC7348] - Mahalingam, M., Dutt, D., Duda, K., Agarwal, P., Kreeger,
         L., Sridhar, T., Bursell, M., and C. Wright, "Virtual
         eXtensible Local Area Network (VXLAN): A Framework for
         Overlaying Virtualized Layer 2 Networks over Layer 3 Networks",
         RFC 7348, DOI 10.17487/RFC7348, August 2014, <https://www.rfc-
         editor.org/info/rfc7348>.

   [RFC7367] - Garg, P., Ed., and Y. Wang, Ed., "NVGRE: Network
         Virtualization Using Generic Routing Encapsulation", RFC 7637,
         DOI 10.17487/RFC7637, September 2015, <https://www.rfc-
         editor.org/info/rfc7637>.

   [IPv6-FlowSpec] - R. Raszuk, etc, "Dissemination of Flow
         Specification Rules for IPv6", draft-ietf-idr-flow-spec-v6,
         work in progress.

   [Layer2-FlowSpec] - W. Hao, etc, "Dissemination of Flow Specification
         Rules for L2 VPN", draft-ietf-idr-flowspec-l2vpn, work in
         progress.

   [GPE] - P. Quinn, etc, "Generic Protocol Extension for VXLAN", draft-
         ietf-nvo3-vxlan-gpe, work in progress.

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Acknowledgments

   The authors wish to acknowledge the important contributions of Jeff
   Haas, Susan Hares, Qiandeng Liang, Nan Wu, Yizhou Li, and Lucy Yong.

Authors' Addresses

      Donald Eastlake
      Huawei Technologies
      155 Beaver Street
      Milford, MA 01757 USA

      Tel: +1-508-333-2270
      Email: d3e3e3@gmail.com

      Weiguo Hao
      Huawei Technologies
      101 Software Avenue,
      Nanjing 210012 China

      Email: haoweiguo@huawei.com

      Shunwan Zhuang
      Huawei Technologies
      Huawei Bld., No.156 Beiqing Rd.
      Beijing  100095 China

      Email: zhuangshunwan@huawei.com

      Zhenbin Li
      Huawei Technologies
      Huawei Bld., No.156 Beiqing Rd.
      Beijing  100095 China

      Email: lizhenbin@huawei.com

      Rong Gu
      China Mobile

      Email: gurong_cmcc@outlook.com

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