This comprises 20 bits of MPLS label, 3 EXP (experimental) bits and 1 S (end-of-stack) bit. To eliminate any confusion, these terms are described below: The NetFlow Version 9 record format consists of a packet header followed by at least one or more template or data FlowSets. A Collector device must not assume that the Data FlowSet and the associated Template IDs are exported in the same Export Packet. Notes: ... export-format {Netflow_V5 | Netflow_V9 | IPFIX} The NetFlow protocol version to send: NetFlow v5, NetFlow v9, or IPFIX (known as "NetFlow v10"). Templates make the record format extensible. There are several various formats for the flow records is evolved when the Netflow becomes matured. NetFlow v9 Template FlowSet Format. in the netflow format PDF i obtain from ciscos site. See "NetFlow Version 9 Flow-Record Format" . ブルガリア語 / Български Templates greatly enhance the flexibility of the NetFlow record format, because they allow a NetFlow collector or display application to process NetFlow data. The FlowSet ID is used to distinguish template records from data records. チェコ語 / Čeština NetFlow version 9 export format allows future enhancements to NetFlow without requiring concurrent changes to the basic flow-record format. Pay attention that the Length field will include those padding bits. : the submask in slash notation, Input interface index; default for N is 2 but higher values could be used, TCP/UDP destination port number i.e. DISQUS’ privacy policy. • Data FlowSet-a data FlowSet is a collection of one or more data records that have been grouped together in an export packet. Built by a device (for example, a router) with NetFlow services enabled, the NetFlow export packet is addressed to a NetFlow collector. Templates can be refreshed in two ways. マケドニア語 / македонски IBM Knowledge Center で検索する, IBM Knowledge Center は JavaScript を使用します。 スクリプトが使用不可になっているか、ご使用のブラウザーではサポートされていません。 JavaScript を使用可能にし、再試行してください。. The remainder of the Version 9 data FlowSet is a collection of field values. Status is either unknown (00), Forwarded (10), Dropped (10) or Consumed (11). The new field types have to be updated on the Exporter and Collector but the NetFlow export format would remain unchanged. The value of a Differentiated Services Code Point (DSCP) encoded in the Differentiated Services Field, after modification. The possible values of the field type are vendor specific. Templates are used to describe the type and length of individual fields within a NetFlow data record that match a template ID. BGP Policy Accounting Source Traffic Index, BGP Policy Accounting Destination Traffic Index. Netflow v9: The basic output of the Netflow is the flow record. • Un Template Flowset contient une succession de Template Records (chaque record définit une template). A template record always has a FlowSet ID in the range of 0-255. Minimum IP packet length on incoming packets of the flow, Maximum IP packet length on incoming packets of the flow, Length of the IPv6 source mask in contiguous bits, Length of the IPv6 destination mask in contiguous bits, IPv6 flow label as per RFC 2460 definition, Internet Control Message Protocol (ICMP) packet type; reported as ((ICMP Type*256) + ICMP code), Internet Group Management Protocol (IGMP) packet type, When using sampled NetFlow, the rate at which packets are sampled i.e. Templates that define data record formats begin numbering at 256 since 0-255 are reserved for FlowSet IDs. Understanding a NetFlow flow record. NetFlow Version 9 Field Type Definitions. NetFlow has matured over the years and created numerous formats of flow records. Note the following: The Collector will receive template definitions from the Exporter, normally before receiving Flow Records. NetFlow v9 templates are the big differentiators here. As an example, in the case IN_BYTES, on an access router it might be sufficient to use a 32 bit counter (N = 4), on a core router a 64 bit counter (N = 8) would be required. Each group of data records (that is, each data FlowSet) references a previously transmitted template ID, which can be used to parse the data contained within the records. • … ノルウェー語 / Norsk Please note that DISQUS operates this forum. Thus, the collector should also cache the address of the export device that produced the template ID in order to enforce uniqueness. Rather than supplying information about IP flows, options are used to supply "meta-data" about the NetFlow process itself. To process, store, and query IPv6 flow records, SiLK must be configured for IPv6 by specifying the --enable-ipv6 switch to the configure script when you are building SiLK. This numeric value represents the type of the field. Instead of one flow record table, you see five tables that describe the V8 flow record format for each individual aggregation scheme. bits 0-159. one of the questions i had is this. A FlowSet is a generic term for a collection of records that follow the packet header in an export packet. NetFlow V9 template FlowSet format. Because a template FlowSet may contain multiple template records, this field allows the parser to determine the end of the current template record and the start of the next. デンマーク語 / Dansk • Although in this example the template FlowSet that defines template ID 256 happens to be followed by data FlowSets that reference template ID 256, this setup is for illustration purposes only. When you sign in to comment, IBM will provide your email, first name and last name to DISQUS. The currently defined field types are detailed in Table 6. NetFlow Version 9 Options Template, Table 10. • Packet header-the first part of an export packet, the packet header provides basic information about the packet, such as the NetFlow version, number of records contained within the packet, and sequence numbering, enabling lost packets to be detected. This comprises 20 bits of MPLS label, 3 EXP (experimental) bits and 1 S (end-of-stack) bit. : the submask in slash notation, Output interface index; default for N is 2 but higher values could be used, Source BGP autonomous system number where N could be 2 or 4, Destination BGP autonomous system number where N could be 2 or 4, IP multicast outgoing packet counter with length N x 8 bits for packets associated with the IP Flow, IP multicast outgoing byte counter with length N x 8 bits for bytes associated with the IP Flow, System uptime at which the last packet of this flow was switched, System uptime at which the first packet of this flow was switched, Outgoing counter with length N x 8 bits for the number of bytes associated with an IP Flow. The router assigns each template an ID, which is communicated to the NetFlow Collection Engine along with the template description. NetFlow Version 9 Data FlowSet Format, Table 8. This means that records that are sent over the wire require a “Template” to be sent previously in a Flowset packet. export-format Specifies the format of the export flow records. • Export packets can be composed of both template and data FlowSets, • Template and data FlowSets can be interleaved, • The template ID in the template record maps to the FlowSet ID in a corresponding data FlowSet, • The layout of the data in the data record maps to the fields formats defined in the template record. • Data record-A data record provides information about an IP flow that exists on the device that produced an export packet. • Templates periodically expire if they are not refreshed. This field gives the relevant portion of the NetFlow process to which the options record refers. The Collector should maintain a similar list: . NetFlow Version 9 Packet Header Field Descriptions, The version of NetFlow records exported in this packet; for Version 9, this value is 0x0009, Number of FlowSet records (both template and data) contained within this packet, Time in milliseconds since this device was first booted, Seconds since 0000 Coordinated Universal Time (UTC) 1970, Incremental sequence counter of all export packets sent by this export device; this value is cumulative, and it can be used to identify whether any export packets have been missed, Note: This is a change from the NetFlow Version 5 and Version 8 headers, where this number represented "total flows.". Currently, the template record that describes flow fields has a FlowSet ID of zero and the template record that describes option fields (described below) has a FlowSet ID of 1. 韓国語 / 한국어 A template record always has a FlowSet ID in the range of 0-255. ポルトガル語 / ポルトガル / Português/Portugal When interpreting the NetFlow Version 9 data FlowSet format, note that the fields cannot be parsed without a corresponding template ID. If the specified number of seconds elapses, IPSO exports a record for the flow. If you configure three collectors, each record is sent three times. Cisco supplied values are consistent across all platforms that support NetFlow Version 9. Route distinguisher ensures that the same address can be used in several different MPLS VPNs and that it is possible for BGP to carry several … • Third-party business partners who produce applications that provide collector or display services for NetFlow will not be required to recompile their applications each time a new NetFlow feature is added; instead, they may be able to use an external data file that documents the known template formats, • New features can be added to NetFlow more quickly, without breaking current implementations, • NetFlow is "future-proofed" against new or developing protocols, because the Version 9 format can be adapted to provide support for them. : a value of 100 indicates that one of every 100 packets is sampled, The type of algorithm used for sampled NetFlow: 0x01 Deterministic Sampling ,0x02 Random Sampling, Timeout value (in seconds) for active flow entries in the NetFlow cache, Timeout value (in seconds) for inactive flow entries in the NetFlow cache, Type of flow switching engine: RP = 0, VIP/Linecard = 1, Counter with length N x 8 bits for bytes for the number of bytes exported by the Observation Domain, Counter with length N x 8 bits for bytes for the number of packets exported by the Observation Domain, Counter with length N x 8 bits for bytes for the number of flows exported by the Observation Domain, IPv4 source address prefix (specific for Catalyst architecture), IPv4 destination address prefix (specific for Catalyst architecture), MPLS Top Label Type: 0x00 UNKNOWN 0x01 TE-MIDPT 0x02 ATOM 0x03 VPN 0x04 BGP 0x05 LDP, Forwarding Equivalent Class corresponding to the MPLS Top Label, The type of algorithm used for sampling data: 0x02 random sampling. 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