Siemens RUGGEDCOM ROX II, User Manual

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RUGGEDCOM ROX II
CLI User Guide
Chapter 16
Traffic Control and Classification
Managing Port Mirroring 687
Traffic Control and Classification
Use the traffic control and classification subsystems to control the flow of data packets to connected network
interfaces. RUGGEDCOM ROX II also features tools for traffic analysis and characterization.
CONTENTS
• Section 16.1, “Managing Port Mirroring”
• Section 16.2, “Managing Traffic Control”
• Section 16.3, “Managing Classes of Service”
• Section 16.4, “Managing NetFlow Data Export”
Section 16.1
Managing Port Mirroring
Port mirroring is a troubleshooting tool that copies, or mirrors, all traffic received or transmitted on a designated
port to another mirror port. If a protocol analyzer were attached to the target port, the traffic stream of valid
frames on any source port is made available for analysis.
Select a target port that has a higher speed than the source port. Mirroring a 100 Mbps port onto a 10 Mbps port
may result in an improperly mirrored stream.
Frames will be dropped if the full-duplex rate of frames on the source port exceeds the transmission speed of the
target port. Since both transmitted and received frames on the source port are mirrored to the target port, frames
will be discarded if the sum traffic exceeds the target port’s transmission rate. This problem reaches its extreme in
the case where traffic on a 100 Mbps full-duplex port is mirrored onto a 10 Mbps half-duplex port.
Invalid frames received on the source port will not be mirrored. These include CRC errors, oversized and
undersized packets, fragments, jabbers, collisions, late collisions and dropped events).
NOTE
Port mirroring has the following limitations:
• The target port may sometimes incorrectly show the VLAN tagged/untagged format of the mirrored
frames.
• Network management frames (such as RSTP, GVRP, etc. ) may not be mirrored.
• Switch management frames generated by the switch (such as Telnet, HTTP, SNMP, etc.) may not be
mirrored.
CONTENTS
• Section 16.1.1, “Configuring Port Mirroring”
• Section 16.1.2, “Managing Egress Source Ports”