Question

A network engineer configured Flexible NetFlow to export IPv6 traffic statistics from a WAN edge router to a collector. IPv4 flows appear normally on the collector, but no IPv6 flow records are ever received. The engineer confirms IPv6 traffic is actively transiting the interface and that the exporter and collector reachability are correct. The relevant configuration is: 'ip flow monitor IPV4-MON input' applied on the interface, a flow record with IPv6 match fields, and a flow monitor referencing that record. What is the most likely cause?

Accepted Answer

The interface is missing the 'ipv6 flow monitor <name> input' command; the IPv4 monitor command does not capture IPv6 traffic

Answer

The flow exporter must use a separate destination for IPv6 flows because IPv6 records cannot share a NetFlow v9 template with IPv4

Answer

Flexible NetFlow does not support IPv6 key fields, so the collector must be switched to IPFIX to receive IPv6 records

Answer

The flow record is missing the 'collect counter bytes' field, which prevents IPv6 records from being exported