Westermo MR Series - Manual (Page 174)

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Web Interface and Command Line Reference Guide www.westermo.com
Confi gure > OSPF 4.55
Open Shortest Path First (OSPF) is an Interior Gateway Protocol (IGP) developed for IP networks
based on the shortest path first or link-state algorithm.
The unit uses link-state algorithms to send routing information to all nodes in a network by calcu-
lating the shortest path to each node based on a topography of the network constructed by each
node. Each unit sends that portion of the routing table (keeps track of routes to particular network
destinations) that describes the state of its own links, and it also sends the complete routing struc-
ture (topography).
The advantage of shortest path first algorithms is that they result in smaller more frequent updates
eve rywhere. They converge quickly, thus preventing such problems as routing loops and Count-to-
Infinity (when routers continuously increment the hop count to a particular network). This makes
for a stable network.
Using the Web Page(s)
Enable OSPF:
Setting this parameter to “Yes” enabled OSPF on this unit. A valid configuration file must exist
on the unit, and be specified in the Configuration file parameter.
ID:
The ID the unit is to use. This ID is in the same format as an IPv4 IP address. If the ID is not
specified here, it MUST be specified in the OSPF section of the configuration file, otherwise the
unit will be assigned the ID 0.0.0.0, which may cause problems. Each unit within an OSPF domain
must have a unique ID.
Configuration file:
The file that holds the configuration data for OSPF. The file should have a “.conf” extension.
Default metric:
This parameter defines the cost for the interface. This value represents the cost for traffic to
EXIT the unit. The default value for the metric is 10, and can be set to a value in the range 1 to
65535.
Default priority:
This parameter defines the priority of the unit. The default priority is 2, and can be set to a
value in the range 0 to 255.
Default ’Hello’ interval (s):
This parameter defines the interval at which OSPF ‘Hello’ packets are sent out of the interface.
The ‘Hello’ packets are used to prove liveliness among the OSPF routers.
The default value for the ‘Hello’ interval is 10 seconds, and can be set to a value in the range 1
to 65535 seconds.
Note:
This interval is included in a field in the ‘Hello’ packets, and must match the ‘Hello’ interval
config ured into every OSPF router in the system. For this reason, the parameter should nor-
mally be left at the default value (10 seconds).
Default router dead time (s):
This parameter defines the time a neighbour has been inactive before the unit will declare
it inac tive. When a neighbour has been inactive for this time its state is set to DOWN.
Neighbours that have been inactive for 24 hours are completely removed. The default value for
the router dead time is 40 seconds, and can be set to a value in the range 2 to 2147483647
seconds.