— Generate reports with flow data.
[-hnpPw] [-d debug_level
] [-f format
] [-s sort_field
] [-t tally_lines
utility generates usage reports for flow data sets by IP
address, IP address pairs, ports, packets, bytes, interfaces, next hops,
autonomous systems, ToS bits, exporters, and tags.
- -d debug_level
- Enable debugging.
- -f format
Report format. Choose from the following:
0 Overall Summary
1 Average packet size distribution
2 Packets per flow distribution
3 Octets per flow distribution
4 Bandwidth per flow distribution
5 UDP/TCP destination port
6 UDP/TCP source port
7 UDP/TCP port
8 Destination IP
9 Source IP
10 Source/Destination IP
11 Source or Destination IP
12 IP protocol
13 octets for flow duration plot data
14 packets for flow duration plot data
15 short summary
16 IP Next Hop
17 Input interface
18 Output interface
19 Source AS
20 Destination AS
21 Source/Destination AS
22 IP ToS
23 Input/Output Interface
24 Source Prefix
25 Destination Prefix
26 Source/Destination Prefix
27 Exporter IP
28 Engine Id
29 Engine Type
30 Source Tag
31 Destination Tag
32 Source/Destination Tag
- Display help.
- Use symbolic names where appropriate.
- Display header information.
- Report as percent total.
- -s sort_field
- Sort ascending on field sort_field.
- -S sort_field
- Sort descending on field sort_field.
- -t tally_lines
- Tally totals every tally_lineslines.
- -T title
- Set report title to title.
- Wide output.
Provide a report on top source/destination IP pairs sorted by octets, report in
percent total form for the flows in /flows/krc4
. Use the preload option
to flow-cat to preserve meta information and display it with flow-stat.
flow-cat -p /flows/krc4 | flow-stat -f10 -P -p -S4
Many times a campus network will have a single border router which has one
interface pointing to the internal side and many interfaces pointing to other
providers. These interfaces each have a unique numerical id known in SNMP
terms as an ifIndex. The ifIndex to interface name mappings can be determined
by using a tool such as snmpwalk
or using show commands in recent
versions of IOS with the 'show snmp mib ifmib ifindex' or JunOS 'show
interfaces'. Once the ifIndex for each interface is known flow-filter can be
combined with flow-stat to provide reports such as inbound vs outbound top
src/destination IP addresses.
Provide a top source IP address report by outbound traffic, ie the top senders
of traffic on the campus network. Assume the ifIndex of the campus interface
flow-cat -p /flows/krc4 | flow-filter -i5 | flow-stat -f9 -P -p -S3
Provide a top destination IP address report by outbound traffic, ie the top
sinks of traffic on the campus network. Assume the ifIndex of the campus
interface is 5.
flow-cat -p /flows/krc4 | flow-filter -I5 | flow-stat -f8 -P -p -S3
Provide a top source/destination AS report. Use symbolic names.
flow-cat -p /flows/krc4 | flow-stat -f20 -n -P -p -S4
Mark Fullmer email@example.com