Cisco Cisco IOS Software Release 12.0(15)S
NetFlow ToS-Based Router Aggregation
Feature Overview
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Cisco IOS Release 12.0(15)S, 12.0(16)ST, 12.2(14)S, and 12.2(4)T
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Reduce the required bandwidth between the router and the workstations
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Reduce the number of collection workstations required
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Improve performance and scalability on high flow-per-second routers
NetFlow Aggregation Cache
Cisco IOS NetFlow aggregation maintains one or more extra flow caches with different combinations of
fields that determine which traditional flows are grouped together. These extra flow caches are called aggre-
gation caches. As flows expire from the main flow cache, they are added to each enabled aggregation cache.
fields that determine which traditional flows are grouped together. These extra flow caches are called aggre-
gation caches. As flows expire from the main flow cache, they are added to each enabled aggregation cache.
Note
The normal flow ager process runs on each active aggregation cache the same way it runs
on the main cache. On-demand aging is also supported.
on the main cache. On-demand aging is also supported.
ToS-Based NetFlow Aggregation Schemes
The NetFlow ToS-Based Router Aggregation feature introduces support for six aggregation schemes that
include the ToS byte as a field. This support is described in the following sections:
include the ToS byte as a field. This support is described in the following sections:
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