ELSA LANCOM Business 6000, Manual

Page: 139 / 174

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Technical basics
139
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ELSA LANCOM Business 6000
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EN
is primarily used for data exchange between stations in a local network
(LAN).
These IPX packets can be excluded from data transmission or routed with
the 'Filter' setting. With the 'Route' setting, packets are transmitted when
there is a connection to the corresponding remote station or an
unoccupied channel is still available for the establishment of another
connection. If all lines are busy with other remote stations, the
propagated frames are discarded.
Backoff
The IPX router uses a special algorithm (exponential backoff) in order to
keep connection costs down during faulty configurations.
If a server is not available in the network of the remote station (e.g.
remote access of a workstation), then the backoff function should be
disabled (see 'Exponential Backoff').
The default state is 'on'.
7.4.4 What happens during data transfer in the IPX network?
When a device logs on in an IPX network, it sends a request to the service
advertising protocol (SAP) and then locates the next accessible server (Get
Nearest Server Request) in the network with the number '00000000'. If there
is a router or server in this network, it will respond to this request and
indicate the correct network number.
The servers regularly send information about which services they provide and
which other networks they are able to access. They also use special data
packets according to the service advertising protocol or routing information
protocol (RIP).
When the IPX router is configured and connected, it establishes connection
to all remote stations accessible via the routing tables and exchanges SAP
and RIP information with these networks. The router stores this data in its
internal SAP and RIP tables.
7.4.5 RIP and SAP tables
The RIP and SAP information is sorted alphabetically in the corresponding
tables. RIPs are arranged only according to the network, whereas SAPs are
arranged at first according to service type then according to server name.