Albedo xGenius - Generation of Ipv4 Traffic

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User Guide
80
Some test payloads are byte patterns (BERT pattern, all-Zeroes pattern) but some
others have a more complex structure like the SLA test payload. Specifically, the SLA
test payload used by test unit is a proprietary extension of the Operations,
Administration and Maintenance (OAM) payload defined by standard ITU-T Y.1731.
4.2.Generation of IPv4 Traffic
Without a Network layer, all the Ethernet traffic generated by test unit would be unable
lo leave the local network and reach remote networks. The Network Layer, or Layer 3,
provides end-to-end connectivity between stations that can use heterogeneous
underlying technologies and they are not necessarily attached to the same network.
Routers are devices that are designed to manage Layer 3 protocols and data
forwarding based on routing tables.
The Internet Protocol (IP) is the most popular Layer 3 protocol. It was conceived by the
U.S. Department of Defence (DoD) during the cold war to facilitate communication
between dissimilar computer systems in a reliable way. IP interconnects public or
private autonomous systems providing a connectionless service.
There are two IP protocol versions (IPv4 and IPv6). IPv4 addresses can be defined as
a subset of the IPv6 addressing space but IPv4 and IPv6 can be regarded as different
and incompatible network protocols in any other sense. Currently, xGenius traffic
generation functionality is compatible with version four of the IP protocol (IPv4). Traffic
analysis include both versions of the IP protocol, IPv4 and IPv6.
The correct operation mode for IPv4 packet generation is the IP Endpoint mode.
Basically, the traffic generator in IP Endpoint mode is configured in the same way than
in Ethernet Endpoint mode. However, there are some differences to be taken into
account:
•In IP Endpoint mode, the test equipment becomes a host in an IP network and it
has similar properties than any other network equipment. For this reason it is nec-
essary to assign a valid IP profile to the tester either automatically (DHCP) or by
hand.
BERT Patterns
• PRBS 2
23
-1 /2
23
-1 inverted: This is a pseudo-random bit
pattern specified in ITU-T O.150 for special measurement
tasks.
• User: Sets a 32-bit, user configurable word as the trans-
mitted pattern.
User payload Here it is configured the value of the user payload that is
used as the transmitted pattern when BERT Pattern is set to
User.
Table 4.3: Ethernet Frame Settings
Setting Description