The option
type summary [cost 1-16777215]
specifies internal routes in the configured range of RAs and
the user-configured cost for an area summary range. If cost is specified, the range will advertise the specified cost
instead of the calculated cost.
If
[no] advertise
is used in the command, the ABR prevents the selected internal routes from being
summarized in a type-3 LSA and advertised to the backbone.
If
no-advertise
is not used in the command, the selected routes are summarized to the backbone in a type-3
LSA.
Option
nssa
specifies external routes (type-7 LSAs) in the configured range of route advertisements. If
no-
advertise
(above) is used in the command, the ABR prevents the selected external routes from being
summarized in a type-5 LSA and advertised to the backbone. (Configure this option where an ABR for an NSSA
advertises external routes that you do not want propagated to the backbone.)
If
no-advertise
is not used in the command, the selected routes learned from type-7 LSAs in the area are
summarized to the backbone in a type-5 LSA.
[cost 1-16777215]
User configured cost for an NSSA summary
range. If cost is not configured, the ABR will use the algorithm defined in RFC 3101 to compute the cost and
metric-type of the summarized route. If cost is specified, then the range will advertise the specified cost as the
cost of the summarized route.
Assigning a cost
The
cost
parameter provides a way to define a fixed, user-assigned cost of an LSA type 3 summarized prefix.
Setting a summary cost to an area
This example shows how to set the summary cost to 100 for area 10 with an address range of 10.10.0.0/16.
switch(ospf)# area 10 range 10.10.0.0/16 type summary cost 100
Using a standard summary cost for an area
This example shows how to use the standard method for determining the summarized cost.
switch(ospf)# area 10 range 10.10.0.0/16 type summary
You must execute
write mem
to preserve these settings across reboots.
Setting a summary cost to an NSSA area
To set the summary cost for NSSA area 20 address range 10.20.0.0/16 to 100 with a default metric-type of type2,
enter the following command.
switch(ospf)# area 20 range 10.20.0.0/16 type nssa cost 100
Setting a summary cost and metric-type to an NSSA area
To set the summary cost and metric-type for NSSA area 20 address range 10.20.0.0/16 to 100, enter the following
command.
switch(ospf)# area 10 range 10.10.0.0/16 type nssa cost 100 metric-type type1
Using the RFC standard ethod to determine the summarized cost to an NSSA area
To change the configuration so that the 10.20.0.0/16 range uses the RFC standard method for determining the
summarized cost, enter the following command.
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