Cisco Cisco IOS Software Release 12.0(26)S Weißbuch
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MPLS-aware NetFlow
Multiprotocol Label Switching (MPLS)-aware NetFlow is an extension of the NetFlow accounting
feature that provides highly granular traffic statistics for Cisco routers. MPLS-aware NetFlow collects
statistics on a per-flow basis just as NetFlow does. A flow is a unidirectional set of packets (IP or MPLS)
that arrives at the router on the same subinterface, has the same source and destination IP addresses, has
the same Layer 4 protocol, the same TCP/UDP source and destination ports, and the same type of service
(TOS) byte in the IP header. In addition, an MPLS flow contains up to three of the same incoming MPLS
labels of interest with experimental bits and end-of-stack bits in the same positions in the packet label
stack. MPLS-aware NetFlow captures MPLS traffic that contains both IP and non-IP packets. It reports
non-IP packets, but sets the IP NetFlow fields to 0. It can also be configured to capture and report
IP packets, setting to 0 the IP NetFlow fields. MPLS-aware NetFlow uses the NetFlow Version 9 export
format. MPLS-aware NetFlow exports up to three labels of interest from the incoming label stack, the
IP address associated with the top label, as well as traditional NetFlow data.
feature that provides highly granular traffic statistics for Cisco routers. MPLS-aware NetFlow collects
statistics on a per-flow basis just as NetFlow does. A flow is a unidirectional set of packets (IP or MPLS)
that arrives at the router on the same subinterface, has the same source and destination IP addresses, has
the same Layer 4 protocol, the same TCP/UDP source and destination ports, and the same type of service
(TOS) byte in the IP header. In addition, an MPLS flow contains up to three of the same incoming MPLS
labels of interest with experimental bits and end-of-stack bits in the same positions in the packet label
stack. MPLS-aware NetFlow captures MPLS traffic that contains both IP and non-IP packets. It reports
non-IP packets, but sets the IP NetFlow fields to 0. It can also be configured to capture and report
IP packets, setting to 0 the IP NetFlow fields. MPLS-aware NetFlow uses the NetFlow Version 9 export
format. MPLS-aware NetFlow exports up to three labels of interest from the incoming label stack, the
IP address associated with the top label, as well as traditional NetFlow data.
A network administrator can turn on MPLS-aware NetFlow inside an MPLS cloud on a subset of
provider backbone (P) routers. These routers can export MPLS-aware NetFlow data to an external
NetFlow collector device for further processing and analysis or show NetFlow cache data on a router
terminal. MPLS-aware NetFlow statistics can be used for detailed MPLS traffic studies and analysis.
provider backbone (P) routers. These routers can export MPLS-aware NetFlow data to an external
NetFlow collector device for further processing and analysis or show NetFlow cache data on a router
terminal. MPLS-aware NetFlow statistics can be used for detailed MPLS traffic studies and analysis.
Feature Specifications for MPLS-aware NetFlow
Feature History
Release
Modification
12.0(24)S
This feature was introduced.
12.0(25)S
The no-ip-fields and mpls-length keywords were added to the ip
flow-cache mpls label-positions command.
flow-cache mpls label-positions command.
12.0(26)S
This feature was implemented on the Cisco 7200 and 7500 platforms and
integrated into Cisco IOS 12.0(26)S. Support was added for the
Cisco 12000 Series 8-Port OC-3 STM ATM line cards.
integrated into Cisco IOS 12.0(26)S. Support was added for the
Cisco 12000 Series 8-Port OC-3 STM ATM line cards.
12.0(26)S1
Support was added for sampled MPLS-aware NetFlow on the Cisco 7200
and 7500 platforms.
and 7500 platforms.
Supported Platforms
Cisco 7200 series, Cisco 7500 series, Cisco 12000 series (For specific line cards that support this
feature, see
feature, see
.)