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RuggedRouter® User Guide
OSPF Interfaces
Figure 138: OSPF Interfaces
Parameters specific to one interface are configured here.
Each interface on the router is listed. Clicking on settings displays a menu of
configuration options for that interface. Clicking on status displays the current status
of the interface, including link state and current OSPF status on the interface. If an
interface is not part of an area it will show up as OSPF not enabled on interface.
Clicking “Remove inactive interfaces” purges the list of any interfaces which are no
longer configured on the router.
The Cost field controls the administrative cost of routing over this interface. By
default the cost is auto calculated as the ospf reference bandwidth divided by the core
interface bandwidth. By default this is 100Mbit/10Mbit = cost 10.
The Priority field controls the priority associated with this interface. By default the
priority of interfaces is 1. The router with the highest priority wins elections for
designated router for an area.
The Hello Interval field controls how often hello packets are sent to other routers in
the area. This value must match on all router interfaces in an area.
The Dead Interval field controls how long to wait for hello packets before declaring
another router dead. This should normally be set to 4 times the hello interval.
The Retransmit Interval field controls the delay between retransmissions.
The Transmit Delay field controls the estimated number of seconds to transmit a link
state update packet. This should take into account transmission and propagation
delays of the interface.
The Passive Interface option controls if an interface is active or passive. Passive
interfaces do not send LSAs to other routers and are not part of an OSPF area.
The Authentication field controls the type of authentication to use when
communicating with other routers. It can be none, null (just check for message
corruption) or message digest, which cryptographically signs each message with a
shared key.
The Message Digest Keys fields allows for addition and deletion of keys to use for
areas connected to this interface when authentication is set to message-digest.
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