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IPv6 Flow

IPv6 Flow. IPv6 Flow Options. Netflow v9 (aka cflow/jflow) Sflow IPFix. Common Netflow versions. Netflow v5 - Fixed record format, no support for IPv6 Supported by Cisco, Juniper, Alcatel Netflow v9 - Variable record format/template, supports IPv6

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IPv6 Flow

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  1. IPv6 Flow

  2. IPv6 Flow Options • Netflow v9 (aka cflow/jflow) • Sflow • IPFix

  3. Common Netflow versions • Netflow v5 - Fixed record format, no support for IPv6 • Supported by Cisco, Juniper, Alcatel • Netflow v9 - Variable record format/template, supports IPv6 • Supported by Cisco and Juniper although Juniper doesn’t yet support IPv6 traffic reporting in cflowd v9

  4. Cisco IPv6 Netflow v9 Configuration • General Configuration • ipv6 flow-export version 9 • Ipv6 flow-export destination <ip-address> <port-no> • Ipv6 flow-export template refresh-rate <rate-value> • Ipv6 flow-export template timeout <timeout-value>

  5. Cisco IPv6 Netflow • Interface specific commands • Ipv6 flow ingress • Ipv6 flow egress

  6. CLI Management Commands • Show ip cache flow • Clear ip flow stats

  7. IPFix • IETF working group effort • Improves on Cisco’s Netflow v9 • See: http://www.nanog.org/meetings/nanog41/presentations/nanog41-ipfix.pdf

  8. Sflow • Includes packet header information • Used by Extreme, Force10, Foundry

  9. Things to Watch For • Simultaneous IPv6 and flow support • Impact of IPv6 flow on router or switch performance • Corner case behavior: • MPLS • Multicast • Dropped packets

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