DRA-2 UNIVERSAL COMMUNICATION NODE
71/158
USER GUIDE - Rev.5 (January 2018)
•
Split-horizon:
This establishes the criteria to be used in processing the routing
data, in order to prevent the “counting to infinity” problem. The options are:
no split-
horizon
,
split-horizon
and
split-horizon with poisoned reverse
(See section 3.4.3 of
[2], bibliography reference).
•
Metric offset:
This field allows the user to set a weight that is added to the metric
of the routes advertised by each of the interfaces. Valid values are from 0 to 15.
Value 0 is not altering the metrics, and 15 is the maximum value that is accepted
as valid metric in RIP. Value 16 is interpreted as infinity.
•
Auth:
This field enables authentication for RIP messages sent on the interface
and, in turn, implies the requirement that the received messages are also
authenticated. Authentication using MD5 is always performed.
•
MD5 Key:
This text field sets the key that is used to calculate the MD5 hash that is
used for the authentication of the RIP packets. Its maximum length is 16
characters.
The common configuration parameters for all interfaces are:
•
Protocol Route Distribution.
This allows it to be indicated whether the protocol
must include not only the routing information obtained through the protocol
messages and IP data of the local interfaces, but also the routing data specified in
the static routes section or other protocols.
•
Default policy advertisement and Specific routes advertisement.
These two
parameters allow filtering options to be established on the routing information. The
first establishes the general filter criteria (permit or reject) and affects all the routes.
The second permits the desired exceptions to the general criteria to be indicated,
and therefore each specific input also includes the permit or reject option.
General criteria options combined with possible exceptions allow the filter to behave in two
ways:
•
Send all with exceptions.
The general
permit
criteria option, which is the default
value, with the exclusions established in the respective section, which in this case,
would have the
reject
option enabled.
•
Only exceptions sent.
The general
reject
criteria option, with the exceptions
established in the respective section, which in this case would have the
permit
option enabled.
