opsawg Z. Li Internet-Draft R. Gu Intended status: Standards Track China Mobile Expires: December 22, 2017 J. Dong Huawei Technologies June 20, 2017 Export BGP community information in IP Flow Information Export (IPFIX) draft-ietf-opsawg-ipfix-bgp-community-02 Abstract This draft introduces several information elements in IPFIX information model [RFC7012] to enable IPFIX [RFC7011] to export the BGP community information, including standard community defined in [RFC1997], extended community defined in [RFC4360], large community defined in [RFC8092], community container defined in [I-D.ietf-idr-wide-bgp-communities]. 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 December 22, 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 Li, et al. Expires December 22, 2017 [Page 1] Internet-Draft Export BGP Community in IPFIX June 2017 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. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. IEs for BGP Standard Community . . . . . . . . . . . . . . . 4 3.1. bgpCommunity . . . . . . . . . . . . . . . . . . . . . . 4 3.2. bgpSourceCommunityList . . . . . . . . . . . . . . . . . 4 3.3. bgpDestinationCommunityList . . . . . . . . . . . . . . . 5 4. IEs for BGP Extended Community . . . . . . . . . . . . . . . 5 4.1. bgpExtendedCommunity . . . . . . . . . . . . . . . . . . 6 4.2. bgpSourceExtendedCommunityList . . . . . . . . . . . . . 6 4.3. bgpDestinationExtendedCommunityList . . . . . . . . . . . 7 5. IEs for BGP Large Community . . . . . . . . . . . . . . . . . 7 5.1. bgpLargeCommunity . . . . . . . . . . . . . . . . . . . . 8 5.2. bgpSourceLargeCommunityList . . . . . . . . . . . . . . . 8 5.3. bgpDestinationLargeCommunityList . . . . . . . . . . . . 9 6. IEs for BGP Community Container . . . . . . . . . . . . . . . 9 7. Message Length Considerations . . . . . . . . . . . . . . . . 10 8. Security Considerations . . . . . . . . . . . . . . . . . . . 10 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12 11. References . . . . . . . . . . . . . . . . . . . . . . . . . 12 11.1. Normative References . . . . . . . . . . . . . . . . . . 12 11.2. Informative References . . . . . . . . . . . . . . . . . 13 Appendix A. Application Example . . . . . . . . . . . . . . . . 14 A.1. Template Record . . . . . . . . . . . . . . . . . . . . . 14 A.2. Data Set . . . . . . . . . . . . . . . . . . . . . . . . 15 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16 1. Introduction IP Flow Information Export (IPFIX) [RFC7011] provides network administrators with traffic flow information using the information elements (IEs) defined in [IANA-IPFIX] registries. Based on the traffic flow information, network administrators know the amount and direction of the traffic in their network, then they can optimize their network when needed. For example, they can steer some flows from the congested links to the low utilized links. [IANA-IPFIX] has already defined the following IEs for traffic flow information exporting in different grain: sourceIPv4Address, sourceIPv4Prefix, destinationIPv4Address, destinationIPv4Prefix, bgpSourceAsNumber, bgpDestinationAsNumber, bgpNextHopIPv4Address, etc. In some circumstances, however, especially when traffic Li, et al. Expires December 22, 2017 [Page 2] Internet-Draft Export BGP Community in IPFIX June 2017 engineering and optimization are used in the Tier 1 or Tier 2 operators' backbone networks, traffic flow information based on these IEs is not suitable. Flow information based on IP address or IP prefix is much more mediculous. On the contrary, flow information based on AS number is too coarse. BGP community [RFC1997], which describes a group of routes sharing some common properties, is preferably used for fine granularity traffic engineering [Community-TE] [RFC4384]. Unfortunately, [IANA-IPFIX] has no IE defined for BGP community information, yet. Flow information based on BGP community can be collected by a mediator defined in [RFC6183]. Mediator is responsible for the correlation between flow information and BGP community. However no IEs are defined in [RFC6183] for exporting BGP community information in IPFIX. Furthermore, to correlate the BGP community with the flow information, mediator needs to learn BGP routes and lookup in the BGP routing table to get the matching entry for the specific flow. Neither BGP route learning nor routing table lookup is trivial for a mediator. Mediator is mainly introduced to release the performance requirement for the exporter [RFC5982]. In fact, to obtain the information for BGP related IEs that have already been defined, such as bgpSourceAsNumber, bgpDestinationAsNumber, and bgpNextHopIPv4Address, etc, exporter has to hold the up-to-date BGP routing table and look up in the BGP routing table. The exporter can get the community information in the same procedure. So, getting BGP community information adds no more requirement for exporter. Some vendors have already implemented this feature in their exporters using private IEs. So, exporter is RECOMMENDED to export the BGP community information in IPFIX directly, other than the mediator. This draft introduces new IEs to extend the IPFIX information model defined in [RFC7012] to export the BGP community information, including standard community defined in [RFC1997], extended community defined in [RFC4360], large community defined in [RFC8092], and community container defined in [I-D.ietf-idr-wide-bgp-communities]. Flow information, such as packetDeltaCount, octetDeltaCount [RFC7012] etc, can then be accumulated and analysed by the collector or other applications based on BGP community. The IEs introduced in this document are applicable for both IPv4 and IPv6 traffic. Both exporter and mediator can use these IEs to export BGP community information in IPFIX. 2. Terminology 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 [RFC2119]. Li, et al. Expires December 22, 2017 [Page 3] Internet-Draft Export BGP Community in IPFIX June 2017 3. IEs for BGP Standard Community [RFC1997] defines the BGP Communities attribute, called BGP Standard Community in this document, which describes a group of routes sharing some common properties. BGP Standard Communities are treated as 32 bit values as stated in in [RFC1997]. In order to export BGP standard community information along with other flow information defined by IPFIX, three new IEs are introduced. One is bgpCommunity, which is used to identify that the value in this IE is a BGP standard community. The other two are bgpSourceCommunityList and bgpDestinationCommunityList, which are both basicList [RFC6313] of bgpCommunity, and are used to export BGP standard community information corresponding to a specific flow's source IP and destination IP respectively. The detailed information of the three new IEs are shown in the following sections. 3.1. bgpCommunity ---------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpCommunity | |--------------------------------------------------------------------| | Data Type | unsigned32 | |--------------------------------------------------------------------| | Data Type Semantics | identifier | |--------------------------------------------------------------------| | Description | BGP community as defined in [RFC1997] | |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------| Figure 1: bgpCommunity 3.2. bgpSourceCommunityList Li, et al. Expires December 22, 2017 [Page 4] Internet-Draft Export BGP Community in IPFIX June 2017 ---------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpSourceCommunityList | |--------------------------------------------------------------------| | Data Type | basicList, as specified in [RFC6313] | |--------------------------------------------------------------------| | Data Type Semantics | list | |--------------------------------------------------------------------| | Description | zero or more BGP communities corresponding | | | with source IP address of a specific flow | |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------| Figure 2: bgpSourceCommunityList 3.3. bgpDestinationCommunityList --------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpDestinationCommunityList | |--------------------------------------------------------------------| | Data Type | basicList, as specified in [RFC6313] | |--------------------------------------------------------------------| | Data Type Semantics | list | |--------------------------------------------------------------------| | Description | zero or more BGP communities corresponding | | |with destination IP address of a specific flow| |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------| Figure 3: bgpDestinationCommunityList 4. IEs for BGP Extended Community [RFC4360] defines the BGP Extended Communities attribute, which provides a mechanism for labeling information carried in BGP. Each Extended Community is encoded as an 8-octet quantity with the format defined in [RFC4360]. In order to export BGP Extended Community information together with other flow information by IPFIX, three new IEs are introduced. The first one is bgpExtendedCommunity, which is used to identify that the value in this IE is a BGP Extended Community. The other two are bgpSourceExtendedCommunityList and Li, et al. Expires December 22, 2017 [Page 5] Internet-Draft Export BGP Community in IPFIX June 2017 bgpDestinationExtendedCommunityList, which are both basicList [RFC6313] of bgpExtendedCommunity, and are used to export the BGP Extended Community information corresponding to a specific flow's source IP and destination IP respectively. The detailed information of the three new IEs are shown in the following sections. 4.1. bgpExtendedCommunity ---------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpExtendedCommunity | |--------------------------------------------------------------------| | Data Type | octetArray | |--------------------------------------------------------------------| | Data Type Semantics | default | |--------------------------------------------------------------------| | |BGP Extended Community as defined in [RFC4360]| | Description |The size of this Information Element is 8 | | |octets. | |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------| Figure 4: bgpExtendedCommunity 4.2. bgpSourceExtendedCommunityList Li, et al. Expires December 22, 2017 [Page 6] Internet-Draft Export BGP Community in IPFIX June 2017 ---------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpSourceExtendedCommunityList | |--------------------------------------------------------------------| | Data Type | basicList, as specified in [RFC6313] | |--------------------------------------------------------------------| | Data Type Semantics | list | |--------------------------------------------------------------------| | | zero or more BGP Extended Communities | | Description | corresponding with source IP address | | | of a specific flow | |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------| Figure 5: bgpSourceExtendedCommunityList 4.3. bgpDestinationExtendedCommunityList ---------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpDestinationExtendedCommunityList | |--------------------------------------------------------------------| | Data Type | basicList, as specified in [RFC6313] | |--------------------------------------------------------------------| | Data Type Semantics | list | |--------------------------------------------------------------------| | | zero or more BGP Extended communities | | Description | corresponding with destination IP address | | | of a specific flow | |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------| Figure 6: bgpDestinationExtendedCommunityList 5. IEs for BGP Large Community [RFC8092] defines the BGP Large Communities attribute, which is suitable for use with all Autonomous System Numbers (ASNs) including four-octet ASNs. Each BGP Large Community is encoded as a 12-octet quantity with the format defined in [RFC8092]. Li, et al. Expires December 22, 2017 [Page 7] Internet-Draft Export BGP Community in IPFIX June 2017 In order to export BGP Large Community information together with other flow information by IPFIX, three new IEs are introduced. The first one is bgpLargeCommunity, which is used to identify that the value in this IE is a BGP Large Community. The other two are bgpSourceLargeCommunityList and bgpDestinationLargeCommunityList, which are both basicList [RFC6313] of bgpLargeCommunity, and are used to export the BGP Large Community information corresponding to a specific flow's source IP and destination IP respectively. The detailed information of the three new IEs are shown in the following sections. 5.1. bgpLargeCommunity ---------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpLargeCommunity | |--------------------------------------------------------------------| | Data Type | octetArray | |--------------------------------------------------------------------| | Data Type Semantics | default | |--------------------------------------------------------------------| | | BGP Large Community as defined in [RFC8092] | | Description | The size of this Information Element is 12 | | | octets. | |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------- Figure 7: bgpLargeCommunity 5.2. bgpSourceLargeCommunityList Li, et al. Expires December 22, 2017 [Page 8] Internet-Draft Export BGP Community in IPFIX June 2017 ---------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpSourceLargeCommunityList | |--------------------------------------------------------------------| | Data Type | basicList, as specified in [RFC6313] | |--------------------------------------------------------------------| | Data Type Semantics | list | |--------------------------------------------------------------------| | | zero or more BGP Large Communities | | Description | corresponding with source IP address | | | of a specific flow | |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------| Figure 8: bgpSourceLargeCommunityList 5.3. bgpDestinationLargeCommunityList ---------------------------------------------------------------------- | ElementID | to be assigned by IANA | |--------------------------------------------------------------------| | Name | bgpDestinationLargeCommunityList | |--------------------------------------------------------------------| | Data Type | basicList, as specified in [RFC6313] | |--------------------------------------------------------------------| | Data Type Semantics | list | |--------------------------------------------------------------------| | Description | zero or more BGP Large communities | | | corresponding with destination IP address | | | of a specific flow | |--------------------------------------------------------------------| | Units | none | |--------------------------------------------------------------------| Figure 9: bgpDestinationLargeCommunityList 6. IEs for BGP Community Container TBD. Li, et al. Expires December 22, 2017 [Page 9] Internet-Draft Export BGP Community in IPFIX June 2017 7. Message Length Considerations The maximum length of one IPFIX message is 65535 bytes as per [RFC7011] and 4096 bytes for one BGP message as per [RFC4271]. Since BGP communities, including standard, extended, large and container, are BGP path attributes distributed in update messages, the length of them can not exceed the length of a BGP message, i.e. 4096. So one IPFIX message with maximum length of 65535 has enough space to fit all the communities related to a specific flow, both the source IP and the destination IP related. [I-D.ietf-idr-bgp-extended-messages], however, extends the maximum update message size of BGP beyond 4096 bytes to 65535 bytes. BGP speakers that support the extended message SHOULD take care to handle the IPFIX message properly, such as only convey as many communities as possible in the IPFIX message. The collector who receives an IPFIX message with maximum length and BGP communities contained in its data set SHOULD be aware of the BGP communities may be truncated due to limited message space. In this case, it is RECOMMENDED to configure export policy on the exporter to limit the BGP communities to be exported, to export only some specific communities, for example, or not to export some communities. To solve this problem completely, a separate document will be submitted to extend the message length of IPFIX [RFC7011] to 32 bits. 8. Security Considerations This document only defines three new IEs for IPFIX. So, this document itself does not directly introduce security issues. The same security considerations as for the IPFIX Protocol Specification [RFC7011] and Information Model [RFC7012] apply. As the BGP community information is deducible by other means, there are no increased privacy concerns, neither. 9. IANA Considerations This draft specifies the following IPFIX IEs to export BGP community information along with other flow information. The Element IDs for these IEs are solicited to be assigned by IANA. The following table is for IANA's reference to put in each field in the registry. ---------------------------------------------------------------------- |ElementID| Name | Data Type|Data Type Semantics| |--------------------------------------------------------------------| Li, et al. Expires December 22, 2017 [Page 10] Internet-Draft Export BGP Community in IPFIX June 2017 | TBA1 | bgpCommunity |unsigned32| identifier | |--------------------------------------------------------------------| | TBA2 | bgpSourceCommunityList | basicList| list | |--------------------------------------------------------------------| | TBA3 |bgpDestinationCommunityList| basicList| list | |--------------------------------------------------------------------| | TBA4 | bgpExtendedCommunity |octetArray| default | |--------------------------------------------------------------------| | TBA5 | bgpSourceExtended | | | | | CommunityList | basicList| list | |--------------------------------------------------------------------| | TBA6 | bgpDestinationExtended | | | | | CommunityList | basicList| list | |--------------------------------------------------------------------| | TBA7 | bgpLargeCommunity |octetArray| default | |--------------------------------------------------------------------| | TBA8 |bgpSourceLargeCommunityList| basicList| list | |--------------------------------------------------------------------| | TBA9 | bgpDestinationLarge | | | | | CommunityList | basicList| list | |--------------------------------------------------------------------| ---------------------------------------------------------------------- |ElementID| Description | Units | |--------------------------------------------------------------------| | TBA1 | BGP community as defined in [RFC1997] | | |--------------------------------------------------------------------| | TBA2 | zero or more BGP communities corresponding | | | | with source IP address of a specific flow | | |--------------------------------------------------------------------| | TBA3 | zero or more BGP communities corresponding | | | |with destination IP address of a specific flow| | |--------------------------------------------------------------------| | TBA4 |BGP Extended Community as defined in [RFC4360]| | | |The size of this IE is 8 octets | | |--------------------------------------------------------------------| | | zero or more BGP Extended Communities | | | TBA5 | corresponding with source IP address of | | | | a specific flow | | |--------------------------------------------------------------------| | | zero or more BGP Extended communities | | | TBA6 | corresponding with destination IP address | | | | of a specific flow | | |--------------------------------------------------------------------| | TBA7 | BGP Large Community as defined in [RFC8092] | | | | The size of this IE is 12 octets. | | |--------------------------------------------------------------------| | | zero or more BGP Large Communities | | Li, et al. Expires December 22, 2017 [Page 11] Internet-Draft Export BGP Community in IPFIX June 2017 | TBA8 | corresponding with source IP address | | | | of a specific flow | | |--------------------------------------------------------------------| | | zero or more BGP Large communities | | | TBA9 | corresponding with destination IP address | | | | of a specific flow | | |--------------------------------------------------------------------| ---------------------------------------------------------------------- |ElementID| Range | References | Requester | Revision | date | |--------------------------------------------------------------------| | TBA1 | | RFC1997 |this draft | 0 | | |--------------------------------------------------------------------| | TBA2 | |RFC6313,RFC1997|this draft | 0 | | |--------------------------------------------------------------------| | TBA3 | |RFC6313,RFC1997|this draft | 0 | | |--------------------------------------------------------------------| | TBA4 | | RFC4360 |this draft | 0 | | |--------------------------------------------------------------------| | TBA5 | |RFC6313,RFC4360|this draft | 0 | | |--------------------------------------------------------------------| | TBA6 | |RFC6313,RFC4360|this draft | 0 | | |--------------------------------------------------------------------| | TBA7 | | RFC8092 |this draft | 0 | | |--------------------------------------------------------------------| | TBA8 | |RFC6313,RFC8092|this draft | 0 | | |--------------------------------------------------------------------| | TBA9 | |RFC6313,RFC8092|this draft | 0 | | |--------------------------------------------------------------------| Figure 10: IANA Considerations 10. Acknowledgements The authors would like to thank Benoit Claise and Paul Aitken for their comments and suggestions to promote this document. Appreciations are given to Tianran Zhou, Jeffrey Haas, Ignas Bagdonas, Stewart Bryant, Paolo Lucente, Job Snijders, Jared Mauch, etc, for their discussion in the mail list. 11. References 11.1. 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, . Li, et al. Expires December 22, 2017 [Page 12] Internet-Draft Export BGP Community in IPFIX June 2017 [RFC6313] Claise, B., Dhandapani, G., Aitken, P., and S. Yates, "Export of Structured Data in IP Flow Information Export (IPFIX)", RFC 6313, DOI 10.17487/RFC6313, July 2011, . [RFC7011] Claise, B., Ed., Trammell, B., Ed., and P. Aitken, "Specification of the IP Flow Information Export (IPFIX) Protocol for the Exchange of Flow Information", STD 77, RFC 7011, DOI 10.17487/RFC7011, September 2013, . [RFC7012] Claise, B., Ed. and B. Trammell, Ed., "Information Model for IP Flow Information Export (IPFIX)", RFC 7012, DOI 10.17487/RFC7012, September 2013, . 11.2. Informative References [Community-TE] Shao, W., Devienne, F., Iannone, L., and JL. Rougier, "On the use of BGP communities for fine-grained inbound traffic engineering", Computer Science 27392(1):476-487, November 2015. [I-D.ietf-idr-bgp-extended-messages] Bush, R., Patel, K., and D. Ward, "Extended Message support for BGP", draft-ietf-idr-bgp-extended-messages-21 (work in progress), March 2017. [I-D.ietf-idr-wide-bgp-communities] Raszuk, R., Haas, J., Lange, A., Decraene, B., Amante, S., and P. Jakma, "BGP Community Container Attribute", draft- ietf-idr-wide-bgp-communities-04 (work in progress), March 2017. [IANA-IPFIX] "IP Flow Information Export (IPFIX) Entities", . [RFC1997] Chandra, R., Traina, P., and T. Li, "BGP Communities Attribute", RFC 1997, DOI 10.17487/RFC1997, August 1996, . [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, . Li, et al. Expires December 22, 2017 [Page 13] Internet-Draft Export BGP Community in IPFIX June 2017 [RFC4360] Sangli, S., Tappan, D., and Y. Rekhter, "BGP Extended Communities Attribute", RFC 4360, DOI 10.17487/RFC4360, February 2006, . [RFC4384] Meyer, D., "BGP Communities for Data Collection", BCP 114, RFC 4384, DOI 10.17487/RFC4384, February 2006, . [RFC5982] Kobayashi, A., Ed. and B. Claise, Ed., "IP Flow Information Export (IPFIX) Mediation: Problem Statement", RFC 5982, DOI 10.17487/RFC5982, August 2010, . [RFC6183] Kobayashi, A., Claise, B., Muenz, G., and K. Ishibashi, "IP Flow Information Export (IPFIX) Mediation: Framework", RFC 6183, DOI 10.17487/RFC6183, April 2011, . [RFC8092] Heitz, J., Ed., Snijders, J., Ed., Patel, K., Bagdonas, I., and N. Hilliard, "BGP Large Communities Attribute", RFC 8092, DOI 10.17487/RFC8092, February 2017, . Appendix A. Application Example In this section, we give an example to show the encoding format for the three new introduced IEs. Flow information including BGP communities is shown in the below table. Suppose we want all the fields to be reported by IPFIX. -------------------------------------------------------------------------- |Source ip|Destination ip |Source BGP community|Destination BGP community| -------------------------------------------------------------------------- | 1.1.1.1 | 2.2.2.2 |1:1001,1:1002,8:1001| 2:1002,8:1001 | -------------------------------------------------------------------------- | 3.3.3.3 | 4.4.4.4 |3:1001,3:1002,8:1001| 4:1001,8:1001 | -------------------------------------------------------------------------- Figure 11: Flow information including BGP communities A.1. Template Record Li, et al. Expires December 22, 2017 [Page 14] Internet-Draft Export BGP Community in IPFIX June 2017 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SET ID = 2 | Length = 24 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Template ID = 256 | Field Count = 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0| SourceIPv4Address = 8 | Field length = 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0| DestinationIPv4Address = 12 | Field length = 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0| bgpSourceCommunityList = 459| Field length = 0xFFFF | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0| bgpDestinationCommunityList | Field length = 0xFFFF | | | = 460 | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 12: Template Record Encoding Format In this example, the Template ID is 256, which will be used in the data record. The field length for bgpSourceCommunityList and bgpDestinationCommunityList is 0xFFFF, which means the length of this IE is variable, the actual length of this IE is indicated by the list length field in the basic list format as per [RFC6313]. A.2. Data Set The data set is represented as follows: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SET ID = 256 | Length = 92 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SourceIPv4Address = 1.1.1.1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | DestinationIPv4Address = 2.2.2.2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 255 | List length = 17 |semantic=allof | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | bgpCommunity = 458 | Field Len = 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Source Community Value 1 = 1:1001 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Source Community Value 2 = 1:1002 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Source Community Value 3 = 8:1001 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Li, et al. Expires December 22, 2017 [Page 15] Internet-Draft Export BGP Community in IPFIX June 2017 | 255 | List length = 13 |semantic =allof| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | bgpCommunity = 458 | Field Len = 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Destination Community Value 1 = 2:1002 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Destination Community Value 2 = 8:1001 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SourceIPv4Address = 3.3.3.3 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | DestinationIPv4Address = 4.4.4.4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 255 | List length = 17 |semantic =allof| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | bgpCommunity = 458 | Field Len = 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Source Community Value 1 = 3:1001 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Source Community Value 2 = 3:1002 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Source Community Value 3 = 8:1001 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 255 | List length = 13 |semantic =allof| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | bgpCommunity = 458 | Field Len = 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Destination Community Value 1 = 4:1001 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | BGP Destination Community Value 2 = 8:1001 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 13: Data Set Encoding Format Authors' Addresses Zhenqiang Li China Mobile 32 Xuanwumen West Ave, Xicheng District Beijing 100053 China Email: li_zhenqiang@hotmail.com Li, et al. Expires December 22, 2017 [Page 16] Internet-Draft Export BGP Community in IPFIX June 2017 Rong Gu China Mobile 32 Xuanwumen West Ave, Xicheng District Beijing 100053 China Email: gurong_cmcc@outlook.com Jie Dong Huawei Technologies Huawei Campus, No. 156 Beiqing Rd. Beijing 100095 China Email: jie.dong@huawei.com Li, et al. Expires December 22, 2017 [Page 17]