Cisco Cisco MGX-FRSM-HS2 B Serial Frame Service Module Libro blanco
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Deployment Guide
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managed device through the NAM GUI on the appliance. Credentials to access the managed device need to be
configured in order for these capabilities to be enabled.
Figure 3. Data Sources for Cisco NAM
NAM Data Sources and Export Capabilities
In the context of the NAM, a data source refers to a source of traffic whose entire stream or summaries of data from
that stream are sent to the NAM for monitoring. NAM can monitor a variety of data sources and compute appropriate
metrics. Figure 3 provides a snapshot of all possible sources of data and also the various export mechanisms
supported by NAM. The picture shows NAM’s role as a mediation layer tool - one that collects network data from a
variety of sources, processes it, and then makes it available in one or more ways to northbound applications.
When you are planning and deploying NAMs in your network, it is important to have a clear understanding of how
each of the data sources works, what the trade-offs are to using each of them, and which data source would be most
appropriate in meeting your short- and long-term performance management goals. Table 2 provides the necessary
details.
Table 2.
Data Sources for Cisco NAM
Data Source
Description
Deployment Considerations
Hardware Platforms
SPAN
Different technologies are used to copy
packets of interest and send them to the
NAM for monitoring. SPAN and its
variants, RSPAN and ERSPAN, are
commonly used Cisco technologies for
packet monitoring.
packets of interest and send them to the
NAM for monitoring. SPAN and its
variants, RSPAN and ERSPAN, are
commonly used Cisco technologies for
packet monitoring.
SPAN is available in Cisco Layer 2 and
Layer 3 switches. It is used to copy
packets from a source port or VLAN and
send a copy to a specified destination
port. NAM takes advantage of this
technology to listen to traffic streams on
the selected ports or VLANs.
Layer 3 switches. It is used to copy
packets from a source port or VLAN and
send a copy to a specified destination
port. NAM takes advantage of this
technology to listen to traffic streams on
the selected ports or VLANs.
RSPAN and ERSPAN are variants of
SPAN.
SPAN.
RSPAN transports packets from a remote
switch (on the same Layer 2 network) to
switch (on the same Layer 2 network) to
SPAN technology allows NAM to monitor
a live stream of packets. This means that
NAM gets to monitor an exact copy of all
packets sent in the original packet
stream. Contrast this behavior to
NetFlow, which does not provide access
to the live stream; instead it provides a
summarized update once every few
minutes (at best 1 minute) about key
traffic metrics.
a live stream of packets. This means that
NAM gets to monitor an exact copy of all
packets sent in the original packet
stream. Contrast this behavior to
NetFlow, which does not provide access
to the live stream; instead it provides a
summarized update once every few
minutes (at best 1 minute) about key
traffic metrics.
The live data stream provided by SPAN
allows all of NAM’s features to be used,
including captures, IAP, and voice
monitoring. In contrast, with NetFlow data
sources, which provide only summaries
and not live streams, captures, IAP, and
voice monitoring are not available.
allows all of NAM’s features to be used,
including captures, IAP, and voice
monitoring. In contrast, with NetFlow data
sources, which provide only summaries
and not live streams, captures, IAP, and
voice monitoring are not available.
NAM VSB only accepts ERSPAN and
SPAN is applicable to the Catalyst
6500, Cisco 7600, and the NAM
appliance platforms. In the case of the
appliance, SPAN is set up on the
connected Layer 3 or Layer 2 switch
and forwarded out of the port to which
the appliance is connected.
6500, Cisco 7600, and the NAM
appliance platforms. In the case of the
appliance, SPAN is set up on the
connected Layer 3 or Layer 2 switch
and forwarded out of the port to which
the appliance is connected.