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Configuring Active Flow Monitoring
In active flow monitoring, the routing platform
participates in both the monitoring application and in the normal
routing functionality of the network. Although the Monitoring Services
PIC was designed initially for use as an offline passive flow monitoring
tool, it can also be used in an active flow monitoring topology.
Table 36 shows
which Juniper Networks PICs and corresponding routing platforms support
active flow monitoring. For more information on Juniper Networks PICs,
see the PIC guide that corresponds to your routing platform.
Table 36: Passive
and Active Flow Monitoring PIC Support
|
PIC Type and Service
|
J-series
|
M5/M10
|
M7i/M10i
|
M20
|
M40e
|
M120
|
M160
|
T-series/
M320
|
TX
Matrix
|
|
Monitoring Services PIC: active flow monitoring
|
No
|
Yes
(version 8 only)
|
Yes
|
Yes
|
Yes
|
No
|
Yes (version 8 only)
|
No
|
No
|
|
Monitoring Services II PIC: flow collection services
|
No
|
No
|
No
|
No
|
Yes
|
No
|
Yes (version 8 only)
|
No
|
No
|
|
Adaptive Services PIC:
active flow monitoring
|
No
|
Yes
(version 8 only)
|
Yes
|
Yes
|
Yes
|
No
|
Yes (version 8 only)
|
No
|
No
|
|
Adaptive Services II PIC:
active flow monitoring
|
No
|
Yes
(version 8 only)
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes (version 8 only)
|
Yes
|
Yes
|
|
Adaptive Services II PIC: flow-tap services
|
No
|
No
|
Yes
|
Yes
|
Yes
|
Yes
|
No
|
Yes
|
No
|
|
MultiServices 100 PIC: active flow monitoring
|
No
|
No
|
Yes
|
No
|
Yes
|
No
|
No
|
Yes
|
Yes
|
|
MultiServices 400 PIC: active flow monitoring
|
No
|
No
|
No
|
No
|
Yes
|
Yes
|
No
|
Yes
|
Yes
|
|
MultiServices 500 PIC: active flow monitoring
|
No
|
No
|
No
|
No
|
Yes
|
Yes
|
No
|
Yes
|
Yes
|
|
JUNOS software-enabled
active flow monitoring
|
Yes (version 8 only)
|
No
|
No
|
No
|
No
|
No
|
No
|
No
|
No
|
Specified packets can be filtered and sent to the
monitoring interface. For the Monitoring Services PIC, the interface
name contains the mo- prefix. For the Adaptive Services PICs
and MultiServices PICs, the interface name contains the sp- prefix.
 |
Note:
If you upgrade from the Monitoring Services PIC
to the Adaptive Services PIC or MultiServices PIC for active flow
monitoring, you must modify the interface name of your monitoring
interface from mo-fpc/pic/port to sp-fpc/pic/port.
|
The major active flow monitoring actions you can
configure at the [edit forwarding-options] hierarchy level
are as follows:
- Sampling, with the [edit forwarding-options sampling] hierarchy. This option extracts limited information (such as the
source and destination IP address) from a copy of some of the packets
in a flow, while the original packets are forwarded to the intended
destination.
- Templates, with the [edit forwarding-options sampling] and [edit services monitoring] hierarchies. With active
flow monitoring version 9, you can use templates to organize the data
gathered from sampling.
- Discard accounting, with the [edit forwarding-options
accounting] hierarchy. This option quarantines unwanted packets,
creates flow monitoring records that describe the packets, and discards
the packets instead of forwarding them.
- Port mirroring, with the [edit forwarding-options
port-mirroring] hierarchy. This option makes one full copy of
all packets in a flow and delivers the copy to a single destination.
- Multiple port mirroring, with the [edit forwarding-options
next-hop-group] hierarchy. This option allows multiple copies
of selected traffic to be delivered to multiple destinations. (Multiple
port mirroring requires a Tunnel Services PIC.)
- Flow-tap services processing, with the [edit services
flow-tap] hierarchy. This option sends copies of packets that
match dynamic filter criteria to one or more content destinations.
Unlike passive flow monitoring, you do not need
to configure a monitoring group. Instead, you can send filtered packets
to a monitoring services or adaptive services interface (mo- or sp-) by using sampling or discard accounting. Optionally,
you can configure port mirroring or multiple port mirroring to direct
packets to additional interfaces.
These active flow monitoring options provide a
wide variety of actions that can be performed on network traffic flows.
However, the following restrictions apply:
- The routing platform can perform either sampling or port mirroring at any one time.
- The routing platform can perform either forwarding or discard accounting at any one time.
Because the Monitoring Services PIC, Adaptive Services
PIC, and MultiServices PIC allow only one action to be performed at
any one time, the following configuration options are available:
- Sampling and forwarding
- Sampling and discard accounting
- Port mirroring and forwarding
- Port mirroring and discard accounting
- Sampling and port mirroring on different sets of traffic
To configure active flow monitoring, complete these
steps:
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