flow Example of Using Two Flow The table below lists definitions for the data export record terms used in the source prefix-ToS aggregation scheme. Repeat Steps 12 through 14 to enable NetFlow on other interfaces. to configure a customized flow record. flow tcp, ... Configuration Examples; Cisco Unified Border Element (SP Edition) Configuration Profile Examples. To locate and download MIBs for selected platforms, Cisco IOS XE releases, and feature sets, use Cisco MIB Locator found at the following URL: No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature. The following Flexible NetFlow predefined records are associated with a Flexible NetFlow flow monitor the same way that you associate a user-defined (custom) record. Cisco ASR 1000 Series Aggregation Services Router (ASR): Flexible NetFlow; Cisco ASR 9000 Series Aggregation Services Router (ASR): Sampled NetFlow; Cisco Network Convergence System (NCS) 5000,6000: Flexible NetFlow ... We would be happy to walk through configuration examples with you! interface command verifies that Flexible NetFlow is enabled on an interface. clear cache (Flexible NetFlow), match 2. ipv4 command, and the other The NetFlow source prefix aggregation scheme captures data so that you can examine the sources of network traffic passing through a NetFlow-enabled device. a minimum number of configuration commands. In this mode, the entries in the cache are aged out according (1110R). Flexible NetFlow flow monitor configuration mode and returns to privileged EXEC exporter-name. as required to configure additional key fields for the record. sampler, This format allows export datagrams to contain a subset of the Version 5 export data that is valid for the cache aggregation scheme. flow The Flexible NetFlow "NetFlow original" and "NetFlow IPv4 original input" predefined records can be used interchangeably because they have the same key and nonkey fields. The accounting of NetFlow data warehousing and data mining. The Flexible NetFlow "BGP next-hop ToS" predefined record uses the same key and nonkey fields as the original NetFlow "BGP next-hop ToS" aggregation cache. description, 5. See the figure below. (Optional) Displays the status for a Flexible NetFlow flow monitor. Thus, you can summarize NetFlow export data on the router before the data is exported to a NetFlow data collection system, which has the following benefits: Cisco IOS XE NetFlow aggregation maintains one or more extra caches with different combinations of fields that determine which flows are grouped together. This predefined record can be used to analyze only IPv6 traffic. Cisco ASR 9000 Series Aggregation Services Router Netflow Configuration Guide, Release 4.2.x CISCO sur FNAC.COM Click the links on the left to view the individual chapters in HTML format. The NetFlow Collection Engine collects packets from the router that is running NetFlow and decodes, aggregates, and stores them. match Changes in network behavior indicate anomalies that are clearly demonstrated in Flexible NetFlow data. that are used to create one of the possible permutations. This queue typically empties quickly because the ACK is expected to arrive a few milliseconds after the SYN ACK. services for NetFlow do not have to recompile their applications each time a Source IP address ANDed with the source prefix mask, or the prefix to which the source IP address of the aggregated flows belongs. The Flexible NetFlow can 12. interface interface-type interface-number, 15. Perform this For Flexible NetFlow a nonkey field does not create a new flow. The table below lists definitions for the data export record terms used in the prefix-ToS aggregation scheme. sampler, monitor-name. show The NetFlow destination prefix-ToS aggregation scheme groups flows that have the same destination prefix, destination prefix mask, destination BGP AS, ToS byte, and output interface. You only need to use this command if you want to enable NetFlow on another interface. transport Application monitoring and profiling. Flexible NetFlow improves on original NetFlow by adding the capability to customize the traffic analysis parameters for your specific requirements. The Each flow monitor requires a record to Configuring NetFlow. record-name, 4. It provides statistics on packets flowing through the router, and is emerging as a primary network accounting and security technology. But considering amount of available port capacity on these routers, we suggest using sampling by default to avoid control plane CPU overload. name of an exporter that you created previously. A change in the value of Flexible NetFlow flow monitor configuration mode for the flow monitor that you The following For example: Use the show ip cache verbose flow aggregation source-prefix command to verify the configuration of a source-prefix aggregation cache. You will be able to use the same techniques for analyzing the data. allows the flow to be user defined. The table below lists the key and nonkey fields used in the Flexible NetFlow "autonomous system ToS" predefined record. record {record-name}, 6. Verify that NetFlow Data Export for the aggregation cache is operational. Router(config)# interface fastethernet 0/0/0. record and enters Flexible NetFlow flow record configuration mode. NetFlow users. flow and data flow sets can be intermingled within a single export packet, as Flexible NetFlow, Figure 3. collect monitor command shows the current status of the cache. collect The table below lists the key and nonkey fields used in the Flexible NetFlow "destination prefix ToS" predefined record. The NetFlow protocol-port-tos aggregation scheme groups flows that have a common IP protocol, ToS byte, source and (when applicable) destination port numbers, and source and destination interfaces. A customized show exporter-name, 12. used to send the data that you collect with Flexible NetFlow to a remote system record. Source IP address ANDed with the source prefix mask, or the prefix to which the source IP address of the aggregated flows belongs. that will be present in future data flow sets. record command shows the current status of the flow monitor that you specify. Flexible NetFlow component that is applied to interfaces to perform network persistent caches. The aggregation of export data provides a summarized NetFlow export data that can be exported to a collection device. description Each flow monitor The scheme groups data flows that have the same destination prefix, destination prefix mask, destination BGP AS, and output interface. Configuration Guides. The following }. flow must be created in the cache while network traffic is being monitored. show traffic. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. between hosts by specifically tracking TCP or UDP applications by the class of [[name] Data capture is available with the predefined and user-defined records in Flexible NetFlow. 3. ip flow-aggregation cache {as | as-tos | destination-prefix | destination-prefix-tos | prefix | prefix-port | prefix-tos | protocol-port | protocol-port-tos | source-prefix | source-prefix-tos}, 5. cache timeout active minutes, 6. cache timeout inactive seconds, 7. export destination {{ip-address | hostname} udp-port}. type is “normal”. running-config flow show configure NetFlow Configuration Guide, Cisco IOS XE Release 3S (ASR 1000) Chapter Title. No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. match collect Use Cisco Feature Navigator to find information about platform support and Cisco software image support. This information may then be used to efficiently plan and allocate access, backbone, and application resources and to detect and resolve potential security and policy violations. interface, (Optional) 2. The TCP SYN attack exploits this design by having an attacking source host generate TCP SYN packets with random source addresses toward a victim host. source, http://www.cisco.com/cisco/web/support/index.html. All rights reserved. To verify the aggregation cache configuration, use the following show commands. additional information about the traffic in the flows. Export bandwidth--Export bandwidth use increases for Version 9 (because of template flowsets) versus Version 5. Enters interfaces. In addition, the router provides high-speed logging through Sampled NetFlow Version 9 and The figure below shows the data export format for the protocol-port-tos aggregation scheme. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. 2 VRF's networks (vrf01 and vrf02) are most important and want to configure QoS on Cisco N9K switches. The most recent evolution of the NetFlow export Flow-based analysis techniques are used by network operators to visualize traffic patterns associated with individual routers and switches and network-wide traffic patterns (providing aggregate traffic or application-based views) to provide proactive problem detection, efficient troubleshooting, and rapid problem resolution. monitor, ipv4 monitor, The Flexible NetFlow "source prefix ToS" predefined record creates flows based on source prefixes and ToS values in the network traffic. match The figure below displays the data export format for the prefix-tos aggregation scheme. See the "NetFlow Data Export" section of the "Configuring NetFlow Aggregation Caches" module for more details on NetFlow Data Export Formats. Autonomous system of the source IP address. The Templates provide an extensible The victim destination host sends a SYN ACK back to the random source address and adds an entry to the connection queue. example creates a customized flow record cache for monitoring IPv6 traffic. It is recommended Unless noted otherwise, subsequent releases of that software release train also support that feature. match The flow information available will be customizable by Flexible Exits Flexible NetFlow flow monitor configuration mode and returns to privileged EXEC mode. user-defined does not monitor PPPoE traffic flowing through a Catalyst 6500 Series switch IP address key fields. When a cache entry is aged 3. show collect flow The Flexible NetFlow "destination prefix" predefined record creates flows based on destination prefix traffic flow data. © 2021 Cisco and/or its affiliates. icmp with flow monitors when they are applied to an interface with the show Router(config)#flow monitor . The destination prefix aggregation scheme generates data so that you can examine the destinations of network traffic passing through a NetFlow-enabled device. exchanges monitoring accuracy for router performance. The table below provides a feature-by-feature comparison of original NetFlow and Flexible NetFlow. ASR 1000 OTV Multicast Configuration Example; ASR 1000 OTV Unicast Adjacency Server Configuration Example; Capture PPPoE packet on an Ingress Interface of ASR1000; Configure ASR1000 Local ERSPAN; Configure IOS-XE to display full show running-config for users with low Privilege Levels ip-address} Labels: ... 1000_routers. New features monitor (Optional) You can configure a maximum of two export destinations for each NetFlow aggregation cache. following must be enabled on your device and on any interfaces on which you In the monitor-name, 4. Backward compatibility--Version 9 is not backward-compatible with Version 5 or Version 8. The following example shows how to configure a flow monitor using the Flexible NetFlow "BGP ToS next-hop" predefined record to monitor IPv4 traffic. Exits The Version 9 export format is flexible and extensible, which provides the versatility needed for the support of new fields and record types. CEF --Cisco Express Forwarding. type Flexible NetFlow a combination of key and non-key fields is called a Enter your password if prompted. ID number of the flow sampler (if flow sampling is enabled). support for IPv6 traffic. match interface ... Cisco IOS NetFlow Command Reference. ASR1000 CBWFQ QOS Configuration Example; ASR1000 CBWFQ QOS Configuration Example. {ipv4 ipv4 flow The distinguishing feature of the NetFlow Version to a flow monitor, the overhead load on the router of running the flow monitor figure below, packet 1 is analyzed using a record designed for standard traffic collect One of the most important ways in which the Cisco ASR 1000 Series Router can help in reducing your energy consumption is its capability to consolidate the services of multiple single-function appliances. Other Cisco platforms like the ASR 9000 and ASR 1000 also support VXLAN with EVPN control-plane. exporter, This export will not work over an IPSEC VPN tunnel if the source of the netflow data flow --A set of packets with the same source IP address, destination IP address, protocol, source/destination ports, and type-of-service, and the same interface on which flow is monitored. 9 export format is that it is template-based. optional task to verify the configuration commands that you entered. AS --autonomous system. collect the actual size of the collected section. (Optional) Configures the System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched. The information needed for a security monitoring record for this type of DoS attack might include the following key and nonkey fields: Many users configure a general Flexible NetFlow monitor that triggers a more detailed Flexible NetFlow view of a DoS attack using these key and nonkey fields. On-demand aging is also supported. It indicates the desired quality of service (QoS) for a particular datagram. flow The table below lists the key and nonkey fields used in the Flexible NetFlow "BGP next-hop" predefined record. This configuration helps you prevent any unpredictable behavior because the NAT is not applied on the packets. monitor routing, The table below lists the key and nonkey fields used in the Flexible NetFlow "protocol port ToS" predefined record. {hostname | The attacking device sends a stream of TCP SYNs to a given destination address but never sends the ACK in response to the servers SYN-ACK as part of the TCP three-way handshake. This is an example of a Cisco ASR configuration for enabling flow export. For example: Use the show ip flow export command to verify that NetFlow Data Export is operational for the aggregation cache. Before it can be activated, a flow monitor must be applied to at least one interface. transport exporter The NetFlow functionality is configured on a per-interface basis. NetFlow Minimum Prefix Mask for Router-Based Aggregation. match criterion New information The key and nonkey fields and the counters for the Flexible NetFlow "NetFlow IPv6 original input" predefined record are shown in the table below. Flexible NetFlow This predefined record is particularly useful for capturing data with which you can examine the sources of network traffic passing through a NetFlow-enabled device. Customized flow allows you to quickly identify how much application traffic is being sent The following example shows how to configure Flexible NetFlow egress accounting for IPv4 and IPv6 traffic. A For IPv6 traffic, a minimum prefix mask length of 0 bits is assumed. ipv4 be used to perform different types of analysis on the same traffic. flow NetFlow data enables extensive near-real-time network monitoring capabilities. provide several export destinations. These commands allow you to: 2. show ip cache flow aggregation {as | as-tos | destination-prefix | destination-prefix-tos | prefix | prefix-port | prefix-tos | protocol-port | protocol-port-tos | source-prefix | source-prefix-tos}. a new Version 9 export format field type for the header and packet section records. normal The © 2021 Cisco and/or its affiliates. FastNetMon Netflow v9 configuration for Cisco ASR 9000 Cisco ASR 9000 series routers have solid support for Netflow and can generate Netflow for quite big amount of traffic without any issues. terminal, 3. Each of the predefined records has a unique combination of key and nonkey fields that offer you the built-in ability to monitor various types of traffic in your network without customizing Flexible NetFlow on your router. further analysis and storage. flow monitor-name. This feature lowers bandwidth requirements for NetFlow export data and reduces platform requirements for NetFlow data collection devices. flow, Router(config-flow-cache)# cache timeout active 15, Router(config-flow-cache)# cache timeout inactive 300, Router(config-flow-cache)# export destination 172.30.0.1 991. for a specific type of attack in the network. ip Specifies an interface and enters interface configuration mode. Table 1 examines some of the important integrated services the Cisco ASR 1000 … For a definition of the data export terms used in the aggregation scheme, see the table below. Export formats available for NetFlow aggregation caches are the Version 9 export format and the Version 8 export format. The table below lists definitions for the data export record fields used in the AS aggregation scheme. configuration. You configure a cache aggregation scheme through the use of arguments to the ip flow-aggregation cache command. Example: Configuring Flexible NetFlow for MPLS Support. template. One of the number, 8. If you are familiar with original NetFlow, you already understand the format and content of the data that you collect and export with Flexible NetFlow when you emulate original NetFlow. Flexible NetFlow can be used as a network attack detection tool with capabilities to track all parts of the IP header and even packet sections and characterize this information into flows. The configuration in the flow show The following example is designed to monitor the type of service (ToS) field usage on all interfaces in the router. The aggregated NetFlow data export records report the following: The figure below shows the data export format for the AS aggregation scheme. System uptime (time, in milliseconds since this device was first booted) when the last packet was switched. monitorcommand. description, 5. The Flexible NetFlow "prefix ToS" predefined record creates flows based on source and destination prefixes and ToS traffic flow data. enhances Cisco NetFlow as a security monitoring tool. As there are many request in how to configure VXLAN/EVPN on a given Platform, this Blog post should help to get you get started with a Nexus 9300/9500 (including Nexus 9x00 EX/FX) 8. Flexible NetFlow monitors can be used to monitor egress traffic on interfaces and subinterfaces. In Cisco IOS XE Release 2.1, this feature was introduced on Cisco ASR 1000 Series Routers. monitor The networking This sample starts in global configuration mode: The following example shows how to configure a flow monitor using the Flexible NetFlow "source prefix" predefined record to monitor IPv6 traffic. command enters privileged EXEC mode (enter the password if prompted). The Flexible NetFlow "source prefix" predefined record uses the same key and nonkey fields as the original NetFlow "source prefix" aggregation cache. 2. combination of flow record, flow exporter, and cache type. flow platform, NetFlow data enables network managers to gain a detailed time-based view of application usage over the network. source, The aggregated NetFlow export record reports the following: This aggregation scheme is particularly useful for capturing data so that you can examine the sources and destinations of network traffic passing through a NetFlow-enabled device. exporter monitor-name name Configuring Egress NetFlow accounting with the ip flow egress command might adversely affect network performance because of the additional accounting-related computation that occurs in the traffic-forwarding path of the router. 8. The following commands were modified by this feature: ip flow-aggregation cache, show ip cache verbose flow aggregation, show ip flow export. Your software release may not support all the features documented in this module. flow Creates a flow collect number, 4. evolved as NetFlow has matured. These extra caches are called aggregation caches. Monitors to Analyze the Same Traffic, Figure 4. Flexible NetFlow includes total-length, ESP/FP. cache Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental. and creating flow records in the cache. record-name, 11. in global configuration mode: The following example shows how to configure Flexible NetFlow multiple export destinations. The difference between the original NetFlow aggregation caches and the corresponding predefined Flexible NetFlow records is that the predefined records do not perform aggregation. The Flexible NetFlow "autonomous system ToS" predefined record creates flows based on autonomous system-to-autonomous system and type of service (ToS) traffic flow data. ipv4 The NetFlow AS aggregation scheme reduces NetFlow export data volume substantially and generates AS-to-AS traffic flow data. Book Title. export-protocol 2. enable As your equipment or software versions may vary, we recommend consulting Cisco's knowledge base if you need more information or assistance configuring your device. types. 6. flow {ip | the network. monitor-name [cache [format {csv | The two tables below show the NetFlow fields that are grouped and collected for non-ToS and ToS based cache aggregation schemes. record. The Flexible NetFlow predefined records that are based on the aggregation cache schemes available in original NetFlow do not perform aggregation. flow Flexible Netflow The use of the word partner does not imply a partnership relationship between Cisco and any other company. The Flexible NetFlow "prefix ToS" predefined record uses the same key and nonkey fields as the original NetFlow "destination prefix ToS" aggregation cache. The default aggregation cache size is 4096 bytes. Each flow monitor Repeat Steps 3 and 4 to activate a flow monitor on any other interfaces in the device over which you want to monitor traffic. The aggregated NetFlow export record reports the following: This aggregation scheme is particularly useful for capturing data with which you can examine the sources and destinations of network traffic passing through a NetFlow-enabled device. Your software release may not support all the features documented in this module. Hello The problem is that the capture of netflow from the interfaces works correctly, however, the NAT records is saved without dates, actually the date is 1970. NetFlow is a Cisco IOS XE application used to capture network traffic data. To manage flow aggregation on your router, you need to configure the aggregation cache scheme that groups and collects the fields from which you want to examine data. format using the mode. flow record NFArecord match ipv4 protocol match ipv4 source address match ipv4 destination address match transport source-port match transport destination-port An advanced user can create a customized ], 11. collect in IP datagrams, such as the IP source or destination address and the source or For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. The cache A template flow set provides a description of the fields (Optional) Specifies the name of an exporter that was created previously. The new flow monitor might include input filtering to limit what traffic is visible in the Flexible NetFlow cache along with the tracking of the specific information to diagnose the TCP-based attack. Typical Deployment for statistics ipv4, separate entities in the configuration. udp, original-input, 7. (Optional) new NetFlow feature is added. NetFlow is a flow record. clear template OK, I know now I have maybe killed some of you with confusion that there are actually three difference types. Available with Flexible NetFlow sampling. mode. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. source (Flexible NetFlow), Source UDP or TCP port number if applicable, Destination User Datagram Protocol (UDP) or TCP port number. BGP Flow spec configuration on Cisco ASR1000 In this guide we will cover all required steps to configure BGP Flow Spec on your Cisco ASR 1000 and use it for malicious traffic filtering. running-config The NetFlow prefix-tos aggregation scheme groups together flows that have a common source prefix, source mask, destination prefix, destination mask, source BGP AS, destination BGP AS, input interface, output interface, and ToS byte.
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