Version 9 Formats and Fields

IPV4

Flow selectors:

• Source and destination IP address
• Source and destination address prefix mask lengths
• Source and destination port numbers
• IP protocol and IP type of service
• ICMP type

Flow nonselectors:

• TCP flags
• Input and output SNMP
• Input bytes
• Input packets
• Start time
• End time

MPLS

Flow selectors:

• MPLS label 1
• MPLS label 2
• MPLS label 3

Flow nonselectors:

• Input and output SNMP
• Input bytes
• Input packets
• Start time
• End time

MPLS_IPV4

Flow selectors:

• MPLS label 1
• MPLS label 2
• MPLS label 3

Flow nonselectors:

• Input and output SNMP
• Input bytes
• Input packets
• Start time
• End time

Version

9

Count

Total number of records in the protocol data unit (PDU) or packet. This number includes all of the options FlowSet records, template FlowSet records, and data FlowSet records.

sysUptime

Current time elapsed, in milliseconds, since the routing platform started

UNIX seconds

Current seconds since 0000 UTC 1970

Flow sequence number

Sequence counter of total flows received

Source ID

32-bit value that identifies the data exporter. Version 9 uses the integrated field diagnostics (IFD) SNMP index of the PIC or device that is exporting the data flow. This field is equivalent to engine type and engine ID fields found in versions 5 and 8.

FlowSet ID

FlowSet type. FlowSet ID 0 is reserved for the Template FlowSet.

Length

FlowSet length. Individual template FlowSets might contain multiple template records, which means that the length of template FlowSets varies.

Template ID

Unique template ID assigned to each newly generated template. Templates numbered 256 and higher define data formats. Templates numbered 0 through 255 define FlowSet IDs.

Field Count

Fields in the template record. This field allows the collector to determine the end of the current template record and the start of the next.

Field Type

Field type. These are defined in Table 48.

Field Length

Length, in bytes, of the corresponding field type.

1

IN_BYTES: The number of bytes associated with an IP flow. By default, the length is 4 bytes.

2

IN_PKTS: The number of packets associated with an IP flow. By default, the length is 4 packets.

4

PROTOCOL: The IP protocol byte.

5

TOS: The type of service byte setting of an incoming packet.

6

TCP_FLAGS: The cumulative TCP flags associated with a flow.

7

L4_SRC_PORT: The TCP/UDP source port.

8

IPv4_SRC_ADDR: The IPv4 source address.

9

SRC_MASK: The number of contiguous bits in the source subnet mask.

10

INPUT_SNMP: The IFD SNMP input interface index. By default, the length is 2.

11

L4_DST_PORT: The TCP/UDP destination port number.

12

IPV4_DST_ADDR: The IPv4 destination address.

13

DST_MASK: The number of contiguous bits in the destination subnet mask.

14

OUTPUT_SNMP: The IFD SNMP output interface index. By default, the length is 2.

21

LAST_SWITCHED: The uptime of the device (in milliseconds) at which the last packet of the flow was switched.

22

FIRST_SWITCHED: The uptime of the device (in milliseconds) at which the first packet of the flow was switched.

32

ICMP_TYPE: The ICMP type.

34

SAMPLING_INTERVAL: The rate at which packets are sampled. As an example, a rate of 100 means that one packet is sampled for every 100 packets in the data flow.

35

SAMPLING_ALGORITHM: The type of algorithm being used. Ox01 indicates deterministic sampling and 0x02 indicates random sampling.

70

MPLS_LABEL_1:The first MPLS label in the stack.

71

MPLS_LABEL_2: The second MPLS label in the stack.

72

MPLS_LABEL_3: The third MPLS label in the stack.

FlowSet ID = Template ID

Data FlowSet that associated with a FlowSet ID. The FlowSet ID maps to a previously generated template ID. The flow collector must use the FlowSet ID to find the corresponding template record and decode the flow records from the FlowSet.

Length

FlowSet length. Data FlowSets are fixed in length.

Record Number - Field Value Number

Flow data records, each containing a set of field values. The template record identified by the FlowSet ID dictates the type and length of the field values.

Padding

Bytes (in zeros) that the exporter inserts so that the subsequent FlowSet starts at a 4-byte aligned boundary.

FlowSet ID

FlowSet type. FlowSet ID 1 is reserved for the options template.

Length

FlowSet length. Option template FlowSets are fixed in length.

Template ID

Template ID of the options template. Options template values are greater than 255.

Option Scope Length

Length, in bytes, of any scope field definition that is part of the options template record.

Scope 1 Field Type

Relevant process. The JUNOS software supports the system process (1).

Scope 1 Field Length

Length, in bytes, of the option field.

Padding

Bytes the exporter inserts so that the subsequent FlowSet starts at a 4-byte aligned boundary.

FlowSet ID = Template ID

ID that precedes each options data flow record. The FlowSet ID maps to a previously generated template ID. The collector must use the FlowSet ID to find the corresponding template record and decode the options data flow records from the FlowSet.

Length

FlowSet length. Option FlowSets are fixed in length.

Number of Flow Data Records

Remainder of the options data FlowSet is a collection of flow data records, each containing a set of field values. The template record identified by the FlowSet ID dictates the type and length of the field values.

Padding

Bytes (in zeros) the exporter inserts so that the subsequent FlowSet starts at a 4-byte aligned boundary.