Difference between revisions of "Cisco"

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'''Netflow Version 5''' is the most popular and one of the simplest versions of netflow to enable.
 
'''Netflow Version 5''' is the most popular and one of the simplest versions of netflow to enable.
 
Its popular due to its almost ubiquitous support on Cisco routers as well as the fact that it is also the most efficient in terms of bandwidth usage.
 
Its popular due to its almost ubiquitous support on Cisco routers as well as the fact that it is also the most efficient in terms of bandwidth usage.
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[[Netflow/Cisco/Version_5|Configure V5]]
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To enable netflow you must first enable the global set of commands:
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:ip flow-export destination '''ip_address''' '''port'''
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:ip flow-export source '''interface'''
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:ip flow-export version 5 ['''peer-as''' | '''origin-as''']
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:ip flow-cache timeout active 1
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:ip flow-cache timeout inactive 15
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:snmp-server ifindex persist
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Then enable netflow on all layer 3 interfaces you wish to monitor:
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On older devices use:
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:ip route-cache flow
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Newer devices would use
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:ip flow ingress
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There is also the "ip flow egress" command. This would be used under special circumstances where the above commands can't be applied or you want to capture the Netflow after traffic has been marked.
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Revision as of 11:11, 30 September 2016

Netflow Version 5 is the most popular and one of the simplest versions of netflow to enable. Its popular due to its almost ubiquitous support on Cisco routers as well as the fact that it is also the most efficient in terms of bandwidth usage. Configure V5

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