RACOM M!DGE3, Руководство пользователя

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Configuration parameters are described in the following chapters. Several use case scenarios and
configuration examples are described in the
BABEL Application note
3
.
7.2.2.1. Description
Every router defines which interfaces are used for BABEL protocol to search for available network
neighbors.
Each router is periodically transmitting and receiving Hello packets to determine existence and quality
of a connection to neighboring network nodes. The result information about available routes (paths)
and their quality is shared across the network. Routing tables are exchanged periodically and also after
their update.
Routing path decision is based on a “metric”.
• Metric is set on each interface. It reflects a “price” for the packet reception. The higher the metric
value, the more disadvantageous is usage of such a path.
• Maximum value is 65535.
There are two types of interfaces:
• Wired: assumes a reliable link. The quality is evaluated according to the number of received Hello
packets. If configured limit of lost packets is exceeded, the line is considered down.
• Wireless: assumes a variable connection quality. The price of the interface increases gradually witch
each lost Hello packet until the line is declared down.
Routing decision:
3
https://www.racom.eu/download/hw/ripex/free/eng/1_application/ripex2-app-bab-en.pdf
M!DGE3 Cellular Router – © RACOM s.r.o. 78
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