Connection to the Network
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some kind of analysis over this traffic requiring correlation between received and
transmitted frames. Examples of this are BER and latency analysis.
Table 2.7: Local Ethernet / IP Profile
Result Description
Loop mode The loop mode determines which fields within the Ethernet
frame or the IP datagram are swapped before forwarding. Is
one of the following ones:
• Physical loop: Loops frames without other alteration than
pulse shape regeneration. This mode may cause prob-
lems if it is used in a bridged network.
• MAC loop: Swaps source and destination MAC addresses
before forwarding the frame. This is the correct mode to be
used in bridged networks.
• IP loop: It operates in the same way that the MAC loop
mode but is swaps source and destination IP addresses as
well. This is the correct mode to be used in routed net-
works. The IP loop mode is not available in Ethernet end-
point mode.
• UDP loop: It works in the same way that the IP loop mode
but it swaps source and destination UDP ports as well.
This mode can be used if there are network devices work-
ing at the transport layer like for example firewalls or NAT
routers. The UDP loop mode is not available in Ethernet
endpoint mode.
Traffic to loop Configures which frames are looped in the current test port.
The available configurations are:
• All frames: Loops all frames received in the test port.
• Filtered frames: Loops frames matching any of the eight
receiving filters available for configuration. All non-match-
ing frames are discarded. Use this option if you need a
tight control on the looped frames.
Loop broadcast
frames
Chooses whether to loop Ethernet broadcast frames. If
broadcast loop is disabled, all frames with destination MAC
address set to FF:FF:FF:FF:FF:FF are discarded.
Use this setting if you want to avoid Ethernet broadcast
frames to proliferate and potentially flood the network.
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