Network Working Group P. Mi Internet-Draft Tencent Intended status: Standards Track S. Zhuang Expires: September 14, 2017 J. Dong Huawei March 13, 2017 Monitoring Outgoing Routes Using BMP draft-mi-grow-monitoring-outgoing-bgp-routes-00 Abstract The BGP Monitoring Protocol (BMP) [RFC7854] is designed to monitor BGP [RFC4271] running status, such as BGP peer relationship establishment and termination and route updates. At present, the BMP only monitors the incoming bgp routes (Adj-RIB-In), does not monitor the outgoing bgp routes (Adj-RIB-Out). This draft extends the applicability of BMP [RFC7854] to monitor the outgoing bgp routes. 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). 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/. 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." This Internet-Draft will expire on September 14, 2017. Mi, et al. Expires September 14, 2017 [Page 1] Internet-Draft Monitoring Outgoing BGP Routes March 2017 Copyright Notice 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. Table of Contents 1. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Protocol Extensions . . . . . . . . . . . . . . . . . . . . . 4 3.1. Option 1: Extending BMP Peer Flags . . . . . . . . . . . 4 3.2. Option 2: Introducing Advertise Route Monitoring Message 5 3.3. Optons Comparison . . . . . . . . . . . . . . . . . . . . 6 4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 6. Security Considerations . . . . . . . . . . . . . . . . . . . 6 7. Normative References . . . . . . . . . . . . . . . . . . . . 6 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 1. Terminology This memo makes use of the terms defined in [RFC7854]. Adj-RIB-Out: The Adj-RIBs-Out contains the routes for advertisement to specific peers by means of the local speaker's UPDATE messages. BMP: BGP Monitoring Protocol BMS: BGP Monitoring Station 2. Introduction The BGP Monitoring Protocol (BMP) introduces the availability of monitoring BGP running status, such as BGP peer relationship establishment and termination and route updates. Without BMP, manual query is required if you want to know about BGP running status. With BMP, a router can be connected to a monitoring station and configured to report BGP running statistics to the station for monitoring, which Mi, et al. Expires September 14, 2017 [Page 2] Internet-Draft Monitoring Outgoing BGP Routes March 2017 improves the network monitoring efficiency. BMP facilitates the monitoring of BGP running status and reports security threats in real time so that preventive measures can be taken promptly. The BMP can be used to obtain route view instead of screen scraping. The BMP provides access to unprocessed routing information (Adj-RIB- In) and processed routes (applied inbound policy) of monitored router's peer. Route Monitoring (RM) message defined in [RFC7854] is used to provide an initial dump of all routes received from a peer, as well as an ongoing mechanism that sends the incremental routes advertised and withdrawn by a peer to the monitoring station. At present, the BMP only monitors the incoming bgp routes (Adj-RIB- In), does not monitor the outgoing bgp routes (Adj-RIB-Out). Consider the following scenario: The Station of ISP A is attached to router A, and the route to the Station is advertised to the Users via multiple exit routers (Such as routers C and E). The BMS (BGP Monitoring Station) is used to monitor the bgp running status of routers C and E. Now the operator of ISP A would like to know the status of the routes being advertised out of the ISP A: 1) Outgoing to which peers; 2) Whether the route was rejected by the export policy; 3) The modification of BGP route attributes; 4) To be added later. These status will provide valuable information for network operators, can be used in subsequent optimization procedures. Mi, et al. Expires September 14, 2017 [Page 3] Internet-Draft Monitoring Outgoing BGP Routes March 2017 ********************************* * +---+ * * AS A |BMS| * *+------+ +---+ * *|Station| \ * AS X *+------+ +---+ \ +---+ * +-----------+ * | /| B |-------+-| C |-+----| Transit X |---+ * | / +---+\ +---+ | * +-----------+ | * | / | \\ // | | * AS Y | *+---+/ | \\// | | * +-----------+ | +------+ *| A | | //\ | +----| Transit Y |---+---...| Users| *+---+\ | // \\ | | * +-----------+ | +------+ * \ | / \ | | * AS Z | * \ +---+ +---+ | * +-----------+ | * \| D |---------| E |-+----| Transit Z |---+ * +---+ +---+ * +-----------+ * * * ISP A * * * ********************************* Figure 1: Monitoring Outgoing Routes Using BMP From the above description of the scenario, it can be seen that it is necessary to monitor BGP outgoing routes. This draft extends the applicability of BMP [RFC7854] to monitor the outgoing bgp routes. 3. Protocol Extensions In order to support BMP to monitoring outgoing BGP routes, this document proposes some protocol extensions to BMP. 3.1. Option 1: Extending BMP Peer Flags [RFC7854] defines three bit flags in the Peer Flags field of the per- peer header. The bits are numbered from 0 (the high-order, or leftmost, bit) to 7 (the low-order, or rightmost, bit): o Flag 0: V flag o Flag 1: L flag o Flag 2: A flag Mi, et al. Expires September 14, 2017 [Page 4] Internet-Draft Monitoring Outgoing BGP Routes March 2017 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |V|L|A|O| Res. | +-+-+-+-+-+-+-+-+ Figure 2: Peer Flags This document defines an additional Flag that will be used to monitor the outgoing bgp routes: o Flag TBD: O flag The O flag, if set to 0, indicates that Adj-RIBs-In are synchronized to BMP Station. If set to 1, indicates that Adj-RIBs-Out are synchronized to BMP Station. This flag has no significance when used with other messages but Route Monitoring message. 3.2. Option 2: Introducing Advertise Route Monitoring Message [RFC7854] defines seven message types for transferring BGP messages between cooperating systems: o Type 0: Route Monitoring o Type 1: Statistics Report o Type 2: Peer Down Notification o Type 3: Peer Up Notification o Type 4: Initiation o Type 5: Termination o Type 6: Route Mirroring This document defines an additional message type that will be used to monitor the outgoing bgp routes: o Type TBD: Advertise Route Monitoring The format of Advertise Route Monitoring message will reuse Route Monitoring message, the only difference is the message type value. The support for this new route type is OPTIONAL. Mi, et al. Expires September 14, 2017 [Page 5] Internet-Draft Monitoring Outgoing BGP Routes March 2017 3.3. Optons Comparison Option 1: Reusing the Type 0 information, only introduces an additional flag into the BMP Peer Flags. If the BMP Station does not support the new flag, there is a risk that the BMP Station will wrongly handle the receiving Adj-RIBs-Out information as Adj-RIBs-In information. Option 2: Introduces an additional message type, if the BMP Station does not support it, the receiving new type message will be ignored by the BMP Station Quietly. 4. Acknowledgements TBD. 5. IANA Considerations TBD. 6. Security Considerations TBD. 7. 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, . [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A Border Gateway Protocol 4 (BGP-4)", RFC 4271, DOI 10.17487/RFC4271, January 2006, . [RFC7854] Scudder, J., Ed., Fernando, R., and S. Stuart, "BGP Monitoring Protocol (BMP)", RFC 7854, DOI 10.17487/RFC7854, June 2016, . Authors' Addresses Mi, et al. Expires September 14, 2017 [Page 6] Internet-Draft Monitoring Outgoing BGP Routes March 2017 Penghui Mi Tencent Tengyun Building,Tower A ,No. 397 Tianlin Road Shanghai 200233 China Email: kevinmi@tencent.com Shunwan Zhuang Huawei Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: zhuangshunwan@huawei.com Jie Dong Huawei Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: jie.dong@huawei.com Mi, et al. Expires September 14, 2017 [Page 7]