HP 3500YL - Manual (Page 252)

IP Routing Features
Configuring OSPF
nssa: Specifies external routes (type-7 LSAs) in the
configured range of route advertisements. If
no-advertise
(above) is used in the command, then 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, then the selected
routes learned from type-7 LSAs in the area are
summarized to the backbone in a type-5 LSA.
Examples of an ABR Allowing or Blocking Advertisement of a Range
of Internal Routes Available in an Area.
Both of the following
commands define the same range of internal routes in area 30 to summarize
for injection into the backbone area. (In this example, area 30 can be a normal
or stub area, or an NSSA.)
ProCurve(ospf)# area 30 range 10.0.0.0/8
ProCurve(ospf)# area 30 range 10.0.0.0/8 type summary
Figure 5-29. Example of Defining a Range of Internal Routes To Advertise to the
Backbone
For the same range of routes, you can use either of the following commands
to block injection of a range of summary routes (type-3 LSAs) from area 30
into the backbone.
ProCurve(config)# area 30 range 10.0.0.0/8 type no-advertise
ProCurve(config)# area 30 range 10.0.0.0/8 type no-advertise summary
Figure 5-30. Example of Defining a Range of Internal Routes To Block from Advertising to the Backbone
Example of Allowing or Blocking a Range of External Routes Available
Through an ASBR in an NSSA.
This example applies only to external
routes that can be advertised from an NSSA to the backbone.
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