Instruction Manual

IP Routing Features
Configuring OSPF
ProCurve(config)# area 7 range 192.51.0.0/16 type nssa
Defines the range of external
routes in the Area 7 NSSA to
advertise to the backbone.
ProCurve(config)# area 7 range 192.51.0.0/16 no-advertise type nssa
Defines the range of external
routes in the Area 7 NSSA to
block from advertising to the
backbone.
Figure 5-31. Example of Allowing or Blocking a Range of External Route Advertisements to the Backbone
9. Optional: Influence Route Choices by Changing the
Administrative Distance Default
The administrative distance value can be left in its default configuration
setting unless a change is needed to improve OSPF performance for a specific
network configuration.
The switch can learn about networks from various protocols, including RIP,
and OSPF. Consequently, the routes to a network may differ depending on the
protocol from which the routes were learned. For the switches, covered in
this guide the administrative distance for OSPF routes is set at 110 for all route
types (external, inter-area, and intra-area).
The switch selects one route over another based on the source of the route
information. To do so, the switch can use the administrative distances
assigned to the sources to influence route choices. You can change the
distance settings in the OSPF global context to enable preference of one route
type over another.
Syntax: distance < external | inter-area | intra-area > < 1 - 255 >
Used in the OSPF configuration context to globally reconfigure
the administrative distance priority for the specified route
type. 1 is the highest priority; 255 is the lowest priority.
external < 1 - 255 >: Changes the administrative distance for
routes between the OSPF domain and other EGP domains.
inter-area < 1 - 255 >: Changes the administrative distance for
routes between areas within the same OSPF domain.
intra-area < 1 - 255 >: Changes the administrative distance for
routes within OSPF areas.
Default: 110; Range: 1 - 255
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