Traffic Sampling, Forwarding, and Monitoring User Guide

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Table of Contents Expand all

play_arrow Overview
- Traffic Sampling, Forwarding, and Monitoring Overview
play_arrow Collecting Traffic Samples for Network Monitoring
play_arrow Configuring Traffic Forwarding for Network Monitoring
play_arrow Configuring Forwarding Table Filters to Efficiently Route Traffic
play_arrow Configuring Forwarding Options for Load Balancing Traffic
play_arrow Configuring Other Forwarding Options
play_arrow Configuration Statements and Operational Commands
- Junos CLI Reference Overview

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English

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Example: Sampling All FTP Traffic

date_range 24-Nov-23

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The following configuration gathers statistical information about a moderate percentage of packets using FTP in the output path of a specific T3 interface, and collects the information in a file named t3-ftp-traffic.txt.

Create a filter:

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[edit firewall family inet]
filter ftp-stats {
    term ftp-usage {
        from {
            destination-port [ftp ftp-data];
        }
        then {
            sample;
            accept;
        }
    }
}

Apply the filter to the T3 interface:

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[edit interfaces]
t3-7/0/2 {
    unit 0 {
        family inet {
            filter {
                input ftp-stats;
            }
            address 10.35.78.254/32 {
                destination 10.35.78.4;
            }
        }
    }
}

Finally, gather statistics on 10 percent of the candidate samples:

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[edit forwarding-options]
sampling {
    input {
        rate 10;
    }
    family inet {
        output {
            file {
                filename t3-ftp-traffic.txt;
                files 50;
                size 1m;
            }
        }
    }
}

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Traffic Sampling, Forwarding, and Monitoring User Guide

Example: Sampling All FTP Traffic

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