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5.7.11 Control Default Metrics
OSPF calculates the OSPF metric for an interface according to the bandwidth of the interface. For example,
a 64K link gets a metric of 1562, while a T1 link gets a metric of 64.
If you have multiple links with high bandwidth, you might want to specify a larger number to differentiate the
cost on those links. To do so, perform the following task in router configuration mode.
Command Purpose
auto-cost reference-bandwidth
ref-bw
Differentiate high bandwidth links.
5.7.12 Configure Route Calculation Timers
The user can configure the delay time between when OSPF receives a topology change and when it starts a
shortest path first (SPF) calculation.
To do this, perform the following task in router configuration mode.
Command Purpose
timers spf
spf-delay
Configure route calculation timers.
5.7.13 Refresh Timer Configuration
The originating router keeps track of the LSAs and performs refreshing LSAs when a refresh timer is
reached.
The user can configure the refresh time when OSPF LSAs gets refreshed and sent out. To do this, perform
the following task in router configuration mode.
Command Purpose
refresh
timer <10-1800>
Configure the refresh timer. The time value is in
seconds.
5.7.14 Redistribute Routes into OSPF
The user can re-advertise route information in an OSPF routing domain and conditionally control the
redistribution of routes between two domains by defining route maps.
Perform the following tasks associated with route redistribution in router configuration mode.
Command Purpose
redistribute {kernel | connected | static |
rip | bgp} [metric metric-value] [metric-type
{1|2}][route-map map-tag]
Redistribute routes into OSPF routing
domain.
default-metric number
Cause the OSPF routing protocol to use
the same metric value for all redistributed
routes.
default-information originate [metric
metric-value] [metric-type {1|2}]
5.7.15 Generate a Default Route
The user can force an autonomous system boundary router to generate a default route into an OSPF routing
domain. Whenever you specifically configure redistribution of routes into an OSPF routing domain, the router
automatically becomes an autonomous system boundary router.
However, an autonomous system boundary router does not, by default, generate a default route into the
OSPF routing domain.