Submit a ticketCall us

Welcome to the NEW Success Center. Search all resources (documentation, videos, training, knowledge base articles) or browse resources by product. If you are unable to find what you are looking for, please contact us at customersuccess@solarwinds.com

 

 

 

 

Home > Success Center > Netflow Traffic Analyzer (NTA) > Monitor Border Gateway Protocol and Autonomous Systems with NTA

Monitor Border Gateway Protocol and Autonomous Systems with NTA

Overview

 

This article details how to monitor the Border Gateway Protocol (BGP) and Autonomous Systems (AS) data in NTA. 

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. 

Prerequisites:

  • Each device must be configured as part of an autonomous system network, with specified connections to all neighbors within the system.
  • Each device must be configured to export NetFlow data to NTA.
  • Each device must be configured to include one of the following statistics into the NetFlow exports:
  • Origin-as command includes the origin AS for the source and destination.
  • Peer-as command includes the peer AS for the source and destination.

Note: You cannot include both origin and peer statistics.

  • Each device that exports NetFlow data to NTA must be monitored in NPM.

Note: NTA does not support extracting BGP information from sFlows.

Environment

All NTA versions

Steps

1. If your router uses a BGP protocol, run either of the following commands to include AS in the export:

  • To configure the export from a peer AS:
    Router(config)# ip flow-export version 5 peer-as 
  • To configure the export from an origin AS:
    Router(config)# ip flow-export version 5 origin-as
    Notes:
    • You cannot use both commands.
    • This is only applicable for routers that use BGP protocol.

2. Enable BGP routing and establish a BGP routing process. Run the following commands in global configuration mode:

  • To enable a BGP routing process and place the router in configuration mode:
    Router(config)# router bgp as-number 
  • To flag a network as local to the AS and include it to the BGP table:
    Router(config-router)# network network-number [mask network-mask] [route-map route-map-name] 
    Note: If you want the adjacent routers to export AS information, configure the router to share the ASNs information with the BGP neighbors.

 

3. Set BGP neighbors to internal or external. Run the following command in router configuration mode:

Router(config-router)# neighbor {ip-address | peer-group-name} remote-as as-number 

Notes:

  • BGP supports two kinds of neighbors, internal and external. Internal neighbors may be anywhere in the same AS. External neighbors are in a different AS or may be adjacent to each other and share a subnet.
  • Now that the routers sharing the ASNs are configured, you also have to configure the router to include the ASN information in the flows they are exporting in NetFlow v9 or v5.
     

4. Export the AS information in the NetFlow exports. The following configuration examples show how to configure an export from a peer AS using the Version 5 record format:

Router(config-if)# ip route-cache flow
Router(config)# ip flow-export destination 10.10.10.101 9996
Router(config)# ip flow-export version 5 peer-as
Router(config)# ip flow-export source loopback 0
Router(config)# ip flow-cache timeout

Notes:

  • In this example, you configure export from a peer AS using the ip flow-export version 5 peer-as command. You may also configure export from an origin AS using the ip flow-export version 5 origin-as command.
  • AS information exported by NetFlow may either be:
    • Origin-as - keyword specifies that export statistics include the origin AS for the source and destination. 
    • Peer-as - keyword specifies that export statistics include the peer AS for the source and destination. 
  • For more information, refer to Monitor autonomous system networks through BGP.
Last modified
05:40, 24 Mar 2017

Tags

Classifications

Public