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Cyclades-PR4000
Chapter 11 - Routing Protocols 98
OSPF Menu (continued)
External Metric Defines the metric that will be advertised by OSPF.
External Metric Type For
Type 1
, the total metric of this route is composed of the internal metric (inside the
autonomous system) and the external metric (provided in the previous parameter). For
Type 2
, the total metric of this route is the value provided in the previous parameter.
Parameters that apply only when
OSPF on This Interface
is
Enable
or
Enable Inactive
.
Area ID Identifies the area to which the interface belongs. Areas are created here, then later
defined in CONFIG=>IP=>OSPF =>AREA. Has the format of an IP address, but is not
linked to any IP address in the system. Small OSPF networks will typically have only
one area (the backbone area represented by 0.0.0.0).
Router Priority Priority used by OSPF in multicast networks to elect the designated router. A priority of
1 will make this router the most likely to be chosen. A priority of 2 will make it second
most likely. Set it to 0 (zero) if this router should never be the designated router.
Transit Delay in
Seconds
Estimated transit time in seconds to route a packet through this interface. Use the
preset value (1) or increase the number for slow links
Retransmit Interval * Time in seconds between link-state advertisement retransmissions for adjacencies
belonging to this interface.
Hello Interval * Time in seconds between the hello packets on this interface.
Dead Interval * Inactivity time (seconds) before a neighbor router is considered down.
Poll Interval * Time in seconds between the hello packets sent to an inactive, non-broadcast, multi-
access neighbor.
Password * String of up to 8 characters used to authenticate OSPF packages. The use of this
password is enabled in CONFIG=>IP=>OSPF=>AREA=>AUTHENTICATION TYPE
Metric Defines the cost for normal service. For consistent routing, this parameter should be
determined in the same manner for all routers in the OSPF Area. Normally, metric cost
is defined as an inverse function of interface throughput (e.g. 1 for 100Mbps, 10 for
10Mbps, 65 for T1, 1785 for 56kbps, etc).
Advertise Secondary
IP Address
Causes the router to advertise additional addresses assigned to this interface. These
are configured in CONFIG => INTERFACE =><LINK> =>NETWORK PROTOCOL =>IP.
* Inside a given area, these 4 parameters should be the same for all routers.