There are various network telemetry collection features available that can be used to collect network data periodically from all or selected network devices to have a holistic view of network performance. This will be very useful for capacity planning. The basic features that can be used, and are available across many platforms, are as follows:

• Cisco Netflow:
  • http://www.cisco.com/en/US/products/ps6601/products_ios_protocol_group_home.html
  • http://www.ietf.org/rfc/rfc3954.txt
• Juniper J-Flow:
  • http://www.juniper.net/techpubs/software/erx/junose82/swconfig-ip-services/html/ip-jflow-stats-config2.html
• sFlow:
  • http://www.ietf.org/rfc/rfc3176.txt