--- 1/draft-ietf-idr-flowspec-l2vpn-05.txt 2017-07-03 08:14:17.703779672 -0700 +++ 2/draft-ietf-idr-flowspec-l2vpn-06.txt 2017-07-03 08:14:17.731780340 -0700 @@ -1,164 +1,168 @@ -IDR W. Hao - Q. Liang -Internet Draft Huawei -Intended status: Standards Track Jim Uttaro + +Network Working Group W. Hao +Internet-Draft Q. Liang +Intended status: Standards Track Huawei +Expires: January 4, 2018 J. Uttaro AT&T S. Litkowski Orange Business Service S. Zhuang Huawei -Expires: June 2017 December 30, 2016 + July 03, 2017 Dissemination of Flow Specification Rules for L2 VPN - draft-ietf-idr-flowspec-l2vpn-05.txt + draft-ietf-idr-flowspec-l2vpn-06 Abstract This document defines BGP flow-spec extension for Ethernet traffic filtering in L2 VPN network. SAFI=134 in [RFC5575] is redefined for dissemination traffic filtering information in an L2VPN environment. A new subset of component types and extended community also are defined. -Status of this Memo +Requirements Language + + The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", + "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this + document are to be interpreted as described in RFC 2119 [RFC2119]. + +Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering - Task Force (IETF), its areas, and its working groups. Note that - other groups may also distribute working documents as Internet- - Drafts. - - Internet-Drafts are draft documents valid for a maximum of six - months and may be updated, replaced, or obsoleted by other documents - at any time. It is inappropriate to use Internet-Drafts as - reference material or to cite them other than as "work in progress." + Task Force (IETF). Note that other groups may also distribute + working documents as Internet-Drafts. The list of current Internet- + Drafts is at http://datatracker.ietf.org/drafts/current/. - The list of current Internet-Drafts can be accessed at - http://www.ietf.org/1id-abstracts.html + Internet-Drafts are draft documents valid for a maximum of six months + and may be updated, replaced, or obsoleted by other documents at any + time. It is inappropriate to use Internet-Drafts as reference + material or to cite them other than as "work in progress." - The list of Internet-Draft Shadow Directories can be accessed at - http://www.ietf.org/shadow.html. + This Internet-Draft will expire on January 4, 2018. Copyright Notice - Copyright (c) 2016 IETF Trust and the persons identified as the + Copyright (c) 2017 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents - carefully, as they describe your rights and restrictions with - respect to this document. Code Components extracted from this - document must include Simplified BSD License text as described in - Section 4.e of the Trust Legal Provisions and are provided without - warranty as described in the Simplified BSD License. + carefully, as they describe your rights and restrictions with respect + to this document. Code Components extracted from this document must + include Simplified BSD License text as described in Section 4.e of + the Trust Legal Provisions and are provided without warranty as + described in the Simplified BSD License. Table of Contents - 1. Introduction ................................................ 2 - 2. Layer 2 Flow Specification encoding in BGP................... 3 - 3. Ethernet Flow Specification encoding in BGP.................. 4 - 3.1. Order of Traffic Filtering Rules........................ 6 - 4. Ethernet Flow Specification Traffic Actions.................. 7 - 5. Security Considerations..................................... 10 - 6. IANA Considerations ........................................ 10 - 6.1. Normative References................................... 12 - 6.2. Informative References................................. 12 - 7. Acknowledgments ............................................ 12 + 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 + 2. Layer 2 Flow Specification encoding in BGP . . . . . . . . . 3 + 3. Ethernet Flow Specification encoding in BGP . . . . . . . . . 4 + 3.1. Order of Traffic Filtering Rules . . . . . . . . . . . . 6 + 4. Ethernet Flow Specification Traffic Actions . . . . . . . . . 7 + 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 + 6. Security Considerations . . . . . . . . . . . . . . . . . . . 12 + 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12 + 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 12 + 8.1. Normative References . . . . . . . . . . . . . . . . . . 12 + 8.2. Informative References . . . . . . . . . . . . . . . . . 12 + Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13 1. Introduction BGP Flow-spec is an extension to BGP that allows for the dissemination of traffic flow specification rules. It leverages the BGP Control Plane to simplify the distribution of ACLs, new filter rules can be injected to all BGP peers simultaneously without changing router configuration. The typical application of BGP Flow- spec is to automate the distribution of traffic filter lists to routers for DDOS mitigation, access control, etc. 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. The Flow specification match part only includes L3/L4 information like source/destination prefix, protocol, ports, and etc, so traffic flows can only be selectively filtered based on L3/L4 information. - Layer 2 Virtual Private Networks L2VPNs have already been deployed + Layer 2 Virtual Private Networks (L2VPNs) have already been deployed in an increasing number of networks today. In L2VPN network, we also have requirement to deploy BGP Flow-spec to mitigate DDoS attack traffic. Within L2VPN network, both IP and non-IP Ethernet traffic maybe exist. For IP traffic filtering, the Flow specification rules defined in [RFC5575] which include match criteria and actions can still be used, flow specification rules received via new NLRI format - apply only to traffic that belongs to the VPN instance(s) in which - it is imported. For non-IP Ethernet traffic filtering, Layer 2 - related information like source/destination MAC and VLAN should be + apply only to traffic that belongs to the VPN instance(s) in which it + is imported. For non-IP Ethernet traffic filtering, Layer 2 related + information like source/destination MAC and VLAN should be considered. But the flow specification match criteria defined in RFC5575 only include layer 3 and layer 4 IP information, layer 2 Ethernet information haven't been included. There are different kinds of L2VPN networks like EVPN [EVPN], BGP VPLS [RFC4761], LDP VPLS [RFC4762] and border gateway protocol (BGP) auto discovery [RFC 6074]. Because the flow-spec feature relies on - BGP protocol to distribute traffic filtering rules, so it can only - be incrementally deployed in those L2VPN networks where BGP has - already been used for auto discovery and/or signaling purposes such - as BGP-based VPLS [4761], EVPN and LDP-based VPLS [4762] with BGP - auto-discovery [6074]. + BGP protocol to distribute traffic filtering rules, so it can only be + incrementally deployed in those L2VPN networks where BGP has already + been used for auto discovery and/or signaling purposes such as BGP- + based VPLS [4761], EVPN and LDP-based VPLS [4762] with BGP auto- + discovery [6074]. This draft proposes a new subset of component types and extended community to support L2VPN flow-spec application. The flow-spec - rules can be enforced on all border routers or on some interface - sets of the border routers. SAFI=134 in [RFC5575] is redefined for + rules can be enforced on all border routers or on some interface sets + of the border routers. SAFI=134 in [RFC5575] is redefined for dissemination traffic filtering information in an L2VPN environment. 2. Layer 2 Flow Specification encoding in BGP The [RFC5575] defines SAFI 133 and SAFI 134 for "dissemination of IPv4 flow specification rules" and "dissemination of VPNv4 flow specification rules" respectively. [draft-ietf-idr-flow-spec-v6-06] redefines the [RFC5575] SAFIs in order to make them applicable to both IPv4 and IPv6 applications. This document will further redefine the SAFI 134 in order to make them applicable to L2VPN applications. The following changes are defined: - "SAFI 134 for dissemination of L3VPN flow specification rules" to - now be defined as "SAFI 134 for dissemination of VPN flow - specification rules" + "SAFI 134 for dissemination of L3VPN flow specification rules" to now + be defined as "SAFI 134 for dissemination of VPN flow specification + rules" For SAFI 134 the indication to which address family it is referring to will be recognized by AFI value (AFI=1 for VPNv4, AFI=2 VPNv6 and AFI=25 for L2VPN). Such modification is fully backwards compatible with existing implementation and production deployments. 3. Ethernet Flow Specification encoding in BGP The NLRI format for this address family consists of a fixed-length Route Distinguisher field (8 bytes) followed by a flow specification, following the encoding defined in this document. The NLRI length field shall include both the 8 bytes of the Route Distinguisher as well as the subsequent flow specification. - Flow specification rules received via this NLRI apply only to - traffic that belongs to the VPN instance(s) in which it is imported. - Flow rules are accepted by default, when received from remote PE - routers. + Flow specification rules received via this NLRI apply only to traffic + that belongs to the VPN instance(s) in which it is imported. Flow + rules are accepted by default, when received from remote PE routers. - Besides the component types defined in [RFC5575] and [draft-ietf- - idr-flow-spec-v6-06], this document proposes the following - additional component types for L2VPN Ethernet traffic filtering: + Besides the component types defined in [RFC5575] and [draft-ietf-idr- + flow-spec-v6-06], this document proposes the following additional + component types for L2VPN Ethernet traffic filtering: Type 14 - Ethernet Type Encoding: Defines a list of {operation, value} pairs used to match two-octet field. Values are encoded as 2-byte quantities. Ethernet II framing defines the two-octet Ethernet Type field in an Ethernet frame, preceded by destination and source MAC addresses, that identifies an upper layer protocol encapsulating the frame data. @@ -159,60 +163,57 @@ Defines a list of {operation, value} pairs used to match two-octet field. Values are encoded as 2-byte quantities. Ethernet II framing defines the two-octet Ethernet Type field in an Ethernet frame, preceded by destination and source MAC addresses, that identifies an upper layer protocol encapsulating the frame data. Type 15 - Source MAC Encoding: - Defines the source MAC Address to match. Type 16 - Destination MAC Encoding: - Defines the destination MAC Address to match. Type 17 - DSAP(Destination Service Access Point) in LLC Encoding: - Defines a list of {operation, value} pairs used to match 1-octet - DSAP in the 802.2 LLC(Logical Link Control Header). Values are - encoded as 1-byte quantities. The operation field is encoded as - 'Numeric operator' defined in [RFC5575]. + Defines a list of {operation, value} pairs used to match 1-octet DSAP + in the 802.2 LLC(Logical Link Control Header). Values are encoded as + 1-byte quantities. The operation field is encoded as 'Numeric + operator' defined in [RFC5575]. Type 18 - SSAP(Source Service Access Point) in LLC Encoding: - - Defines a list of {operation, value} pairs used to match 1-octet - SSAP in the 802.2 LLC. Values are encoded as 1-byte quantities. + Defines a list of {operation, value} pairs used to match 1-octet SSAP + in the 802.2 LLC. Values are encoded as 1-byte quantities. Type 19 - Control field in LLC Encoding: Defines a list of {operation, value} pairs used to match 1-octet control field in the 802.2 LLC. Values are encoded as 1-byte quantities. Type 20 - SNAP Encoding: Defines a list of {operation, value} pairs used to match 5-octet - SNAP(Sub-Network Access Protocol) field. Values are encoded as 5- - byte quantities. + SNAP(Sub-Network Access Protocol) field. Values are encoded as + 5-byte quantities. Type 21 - VLAN ID Encoding: Defines a list of {operation, value} pairs used to match VLAN ID. Values are encoded as 2-byte quantities, where the four most significant bits are zero and the 12 least significant bits contain the VLAN value. @@ -290,23 +290,23 @@ cmp = memcmp(data(comp1), data(comp2), common); // not equal, lowest value has precedence // equal, longest string has precedence } } return EQUAL; } 4. Ethernet Flow Specification Traffic Actions - The default action for a layer 2 traffic filtering flow - specification is to accept traffic that matches that particular rule. - The following extended community values per RFC5575 can be used to + The default action for a layer 2 traffic filtering flow specification + is to accept traffic that matches that particular rule. The + following extended community values per RFC5575 can be used to specify particular actions in L2VPN network: +--------+--------------------+--------------------------+ | type | extended community | encoding | +--------+--------------------+--------------------------+ | 0x8006 | traffic-rate | 2-byte as#, 4-byte float | | 0x8007 | traffic-action | bitmask | | 0x8008 | redirect | 6-byte Route Target | | 0x8009 | traffic-marking | DSCP value | +--------+--------------------+--------------------------+ @@ -340,53 +340,53 @@ 0 7 15 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |PO1|PU1|SW1|RI1|RO1|...|PO2|PU2|SW2|RI2|RO2|...| +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | VLAN ID1 |COS1 |R1| +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | VLAN ID2 |COS2 |R2| +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - PO1: Pop action. If the PO1 flag is one it indicates the outmost + PO1: Pop action. If the PO1 flag is one, it indicates the outmost VLAN should be removed. - PU1: Push action. If PU1 is one it indicates VLAN ID1 will be added, - the associated COS is COS1. + PU1: Push action. If PU1 is one, it indicates VLAN ID1 will be + added, the associated COS is COS1. - SW1: Swap action. If the SW1 flag is one it indicates the outer VLAN - and inner VLAN should be swapped. + SW1: Swap action. If the SW1 flag is one, it indicates the outer + VLAN and inner VLAN should be swapped. - PO2: Pop action. If the PO2 flag is one it indicates the outmost + PO2: Pop action. If the PO2 flag is one, it indicates the outmost VLAN should be removed. - PU2: Push action. If PU2 is one it indicates VLAN ID2 will be added, - the associated COS is COS2. + PU2: Push action. If PU2 is one, it indicates VLAN ID2 will be + added, the associated COS is COS2. - SW2: Swap action. If the SW2 flag is one it indicates the outer VLAN - and inner VLAN should be swapped. + SW2: Swap action. If the SW2 flag is one, it indicates the outer + VLAN and inner VLAN should be swapped. - RI1 and RI2: Rewrite inner VLAN action. If the RI flag is one it + RI1 and RI2: Rewrite inner VLAN action. If the RI flag is one, it indicates the inner VLAN should be replaced by a new VLAN, the new VLAN is VLAN ID1, the associated COS is COS1. If the VLAN ID1 is 0, the action is to only modify the COS value of inner VLAN. - RO1 and RO2: Rewrite outer VLAN action. If the RO flag is one it + RO1 and RO2: Rewrite outer VLAN action. If the RO flag is one, it indicates the outer VLAN should be replaced by a new VLAN, the new VLAN is VLAN ID2, the associated COS is COS2. If the VLAN ID2 is 0, the action is to only modify the COS value of outer VLAN. R1 and R2: Reserved for future use. - Giving an example, if the action of PUSH Inner VLAN 10 with COS - value 5 and Outer VLAN 20 with COS value 6 is needed, the format of - the VLAN-action extended community is as follows: + Giving an example, if the action of PUSH Inner VLAN 10 with COS value + 5 and Outer VLAN 20 with COS value 6 is needed, the format of the + VLAN-action extended community is as follows: 0 7 15 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |0 |1 |0 |0 |0 |0 |0 |0 |0 |1 |0 |0 |0 |0 |0 |0 | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | 10 |1 |0 |1 |0 | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | 20 |1 |1 |0 |0 | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ @@ -394,37 +394,31 @@ which includes the fields of action Flags, TPID1 and TPID2. 0 15 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ |TI|TO| Resv | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | TP ID1 | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ | TP ID2 | +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ - - TI: Mapping inner TP ID action. If the TI flag is one it indicates + TI: Mapping inner TP ID action. If the TI flag is one, it indicates the inner TP ID should be replaced by a new TP ID, the new TP ID is TP ID1. - TO: Mapping outer TP ID action. If the TO flag is one it indicates + TO: Mapping outer TP ID action. If the TO flag is one, it indicates the outer TP ID should be replaced by a new TP ID, the new TP ID is TP ID2. Resv: Reserved for future use. -5. Security Considerations - - No new security issues are introduced to the BGP protocol by this - specification. - -6. IANA Considerations +5. IANA Considerations IANA is requested to rename currently defined SAFI 134 per [RFC5575] to read: 134 VPN dissemination of flow specification rules IANA is requested to create and maintain a new registry for "Flow spec L2VPN Component Types". For completeness, the types defined in [RFC5575] and [draft-ietf-idr-flow-spec-v6-06] also are listed here. @@ -464,75 +459,92 @@ transitive" registry: Type value Name Reference ---------- ---------------------------------------- --------- 0x080A Flow spec VLAN action [this document] 0x080B Flow spec TPID action [this document] -6.1. Normative References +6. Security Considerations - [1] [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate + No new security issues are introduced to the BGP protocol by this + specification. - Requirement Levels", BCP 14, RFC 2119, March 1997. +7. Acknowledgements - [2] [RFC5575] P. Marques, N. Sheth, R. Raszuk, B. Greene, J.Mauch, - D. McPherson, "Dissemination of Flow Specification Rules", RFC - 5575, August 2009. + The authors wish to acknowledge the important contributions of Hannes + Gredler, Xiaohu Xu, Zhenbin Li and Lucy Yong. - [3] [RFC4761] K. Kompella, Ed., Y. Rekhter, Ed., "Virtual Private - LAN Service (VPLS) Using BGP for Auto-Discovery and Signaling", - RFC4761, January 2007. +8. References - [4] [RFC4762] M. Lasserre, Ed., V. Kompella, Ed., "Virtual Private - LAN Service (VPLS) Using Label Distribution Protocol (LDP) - Signaling", RFC4762, January 2007. +8.1. Normative References - [5] [RFC6074] E. Rosen, B. Davie, V. Radoaca, "Provisioning, Auto- - Discovery, and Signaling in Layer 2 Virtual Private Networks - (L2VPNs)", RFC6074, January 2011. + [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate + Requirement Levels", BCP 14, RFC 2119, + DOI 10.17487/RFC2119, March 1997, + . -6.2. Informative References + [RFC4761] Kompella, K., Ed. and Y. Rekhter, Ed., "Virtual Private + LAN Service (VPLS) Using BGP for Auto-Discovery and + Signaling", RFC 4761, DOI 10.17487/RFC4761, January 2007, + . - [1] [EVPN] Sajassi et al., "BGP MPLS Based Ethernet VPN", draft- - ietf-l2vpn-evpn-07.txt, work in progress, May, 2014. + [RFC4762] Lasserre, M., Ed. and V. Kompella, Ed., "Virtual Private + LAN Service (VPLS) Using Label Distribution Protocol (LDP) + Signaling", RFC 4762, DOI 10.17487/RFC4762, January 2007, + . - [2] [IEEE 802.1p] Javin, et.al. "IEEE 802.1p: LAN Layer 2 QoS/CoS - Protocol for Traffic Prioritization", 2012-02-15 + [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, + . -7. Acknowledgments + [RFC6074] Rosen, E., Davie, B., Radoaca, V., and W. Luo, + "Provisioning, Auto-Discovery, and Signaling in Layer 2 + Virtual Private Networks (L2VPNs)", RFC 6074, + DOI 10.17487/RFC6074, January 2011, + . - The authors wish to acknowledge the important contributions of - Hannes Gredler, Xiaohu Xu, Zhenbin Li and Lucy Yong. +8.2. Informative References + + [RFC7432] Sajassi, A., Ed., Aggarwal, R., Bitar, N., Isaac, A., + Uttaro, J., Drake, J., and W. Henderickx, "BGP MPLS-Based + Ethernet VPN", RFC 7432, DOI 10.17487/RFC7432, February + 2015, . Authors' Addresses Weiguo Hao - Huawei Technologies + Huawei 101 Software Avenue, Nanjing 210012 China + Email: haoweiguo@huawei.com Qiandeng Liang - Huawei Technologies + Huawei 101 Software Avenue, Nanjing 210012 China + Email: liangqiandeng@huawei.com James Uttaro AT&T + Email: uttaro@att.com - Stephane Litkowski - Orange + James Uttaro + Orange Business Service + Email: stephane.litkowski@orange.com Shunwan Zhuang - Huawei Technologies + Huawei Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China + Email: zhuangshunwan@huawei.com