NetFlow: Difference between revisions

Revision as of 04:14, 21 September 2020

Revision as of 17:16, 27 October 2020

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=== Network flows ===

Cisco standard NetFlow version 5 defines a ''flow'' as a unidirectional sequence of packets that all share seven values which define a unique key for the flow:<ref>https://pliki.ip-sa.pl/wiki/Wiki.jsp?page=NetFlow</ref>

# Ingress interface ([[Simple Network Management Protocol|SNMP]] ifIndex)

# Source [[IP address]]

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# IP [[Type of Service]]

Note that the Egress interface, IP Nexthop or BGP Nexthops are not part of {{what|text=the key|reason=this term not previously mentioned|date=June 2020}}, and may not be accurate if the route changes before the expiration of the flow, or if load-balancing is done per-packet.

This definition of flows is also used for IPv6, and a similar definition is used for [[MPLS]] and [[Layer 2|Ethernet]] flows.