Congestion Control.

Forward pressure and Maximum forwarding rate.

Address caching capacity .

Address learning rate.

Error Frame filtering.

Broadcast frame forwarding and latency.

It should not have head of line blocking.

Flow control should be disabled.

It should have adequate address caching capacity to limit broadcasts intended for address learning .

It should filter illegal frames.

Test reports can be generated in both PDF and XML format and extensive configuration options are available for fine-tuning the tests.

RFC2889	Features
Key Test	Congestion Control. Forward pressure and Maximum forwarding rate. Address caching capacity . Address learning rate. Error Frame filtering. Broadcast frame forwarding and latency.
Traffic Control	Ethernet, VLAN, IPv4 frame support Forwarding, including throughput and forwarding rates Configurable maximum test rates
Learning Parameters	Automatic learning packets for Layer 2 Per test, per trial and per frame size learning
Test Topologies	Full meshed, Partially meshed :one to many/many to one. Multi-port pair definitions, East/West Testing between any combinations of port-speeds
Large Mesh Test Port Matrix	Layer 2 – Up to 320 ports for 1G ports, up to 1000 ports for 10G ports, up to 320 ports for 40/100G ports
Reporting	Reports are available in PDF and .xml format

To Congestion control test determines how a DUT handles congestion, whether the device implements congestion control and whether congestion on one port affects an uncongested port.

The Forward pressure test overloads a DUT/SUT port and measures the output for forward pressure. If the DUT/SUT transmits with an interframe gap less than 96 bits, then forward pressure is detected.

The Maximum Forwarding rate test measures the peak value of the forwarding rate when the load is varied between the throughput value derived from the Fully Meshed Throughput test.

The Address caching capacity test is to determine in the address caching capacity of a LAN switching device

Address Learning Rate test is to determine the rate of address learning of a LAN switching device.

Error Frame Filtering test is to determine the behavior of the DUT under error or abnormal frame conditions. This test will determine if errored packets are correctly forwarded, or filtered, through the DUT.

The errored packet types are:

Oversize frames – Frames above 1518 (or 1522 if VLAN tagged) in length.

Undersize frames – Frames less than 64 bytes in length.

CRCerrored frames – Frames with invalid CRC that fail the Frame Check Sequence Validation.

Dribble bit errors – Frames without proper byte boundary.

Alignment errors – Combination of CRC errored and dribble bit errored frames.

Broadcast Frame forwarding test is to determine the throughput and latency of the DUT when forwarding broadcast traffic.This test will determine if the Layer 2 switch can handle broadcast traffic from one-to-many ports at various traffic loads.

• Determines the capability of the layer 2 device by doing standard tests.
• Checks for the Head of line blocking in a device.
• Checks the flow control.
• All RFC 2889 tests over any topology including VLANs, MPLS and other available protocols on Aticara TestCenter.
• Test performance in IPv4 configurations.
• Test performance of different IMIX distributions .
• Large port, full mesh tests through millions of available streams .
• Reduce time-to-test through easy configuration wizards and fast execution.