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-rw-r--r--test_spec/vswitchperf_ltd.md42
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diff --git a/test_spec/vswitchperf_ltd.md b/test_spec/vswitchperf_ltd.md
index e396e7fd..0b2d308a 100644
--- a/test_spec/vswitchperf_ltd.md
+++ b/test_spec/vswitchperf_ltd.md
@@ -944,6 +944,48 @@ The following represents possible deployments which can help to determine the pe
- Physical → Virtual Switch → Physical.
<br/>
----
+<a name="ScalabilityTests"></a>
+####2.3.3 Scalability tests
+
+ The general aim of these tests is to understand the impact of large flow table size and flow lookups on throughput.
+
+ The following list is not exhaustive but should indicate the type of tests that should be required. It is expected that more will be added.
+
+<br/>
+ - #####Test ID: LTD.Scalability.RFC2544.0PacketLoss
+
+ **Title**: RFC 2544 0% loss Scalability throughput test
+
+ **Prerequisite Test**:
+
+ **Priority**:
+
+ **Description**:
+
+ The aim of this test is to measure how throughput changes as the number of flows in the DUT increases.
+
+ For each frame size previously defined under [Default Test Parameters](#DefaultParams) and for each of the following number of flows:
+
+ - 1,000
+ - 2,000
+ - 2,000
+ - 4,000
+ - 8,000
+ - 16,000
+ - 32,000
+ - 64,000
+
+ The maximum 0% packet loss throughput should be determined in a manner identical to LTD.Throughput.RFC2544.PacketLossRatio.
+
+ **Expected Result**:
+
+ **Metrics Collected**:
+
+ The following are the metrics collected for this test:
+
+ - The maximum number of frames per second that can be forwarded at the specified number of flows and the specified frame size, with zero packet loss.
+<br/>
+----
[RFC1242]:(http://www.ietf.org/rfc/rfc1242.txt)
[RFC2544]:(http://www.ietf.org/rfc/rfc2544.txt)
[RFC2885]:(http://www.ietf.org/rfc/rfc2885.txt)