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Configuring Actively Monitored Interfaces on M, MX and T Series Routers

Configure the input interfaces and apply the firewall filter that you defined earlier. Unlike passive flow monitoring, the input interfaces for active flow monitoring are not restricted, so you can select most standard network interfaces (such as ATM1 or Ethernet-based interfaces) as the input.

If you configure active flow monitoring with sampling, you can configure an interface filter in place of a firewall filter with the sampling statement at the [edit interfaces interface-name-fpc/pic/port unit unit-number family inet] hierarchy level.