
Customizing OSPF Services
308627-14.20 Rev 00
6-55
Configuring an NSSA Address Range
If you configured one or more announce policies to advertise routing information
from an NSSA, you can configure at least one type 7 address range on the NSSA
border router. An NSSA address range provides summarization and filtering in the
translation of type 7 LSAs to type 5 LSAs. Each type 7 address range consists of
an address/mask pair representing multiple external networks.
The NSSA border router checks for configured type 7 address ranges and then
originates a single type 5 LSA for each range. If a network is not contained in any
configured address range and you enabled the forced translation of type 7 AS
external LSAs to type 5 LSAs, type 7 LSAs are translated to type 5 LSAs directly
and flooded to all non-stub areas.
Using the BCC
To configure an address range for an NSSA, go to the global OSPF prompt (for
example,
box; ip; ospf
) and enter:
nssa-range
<network>/<mask>
network
and
mask
together specify all networks that belong to the NSSA address
range. The range mask is not restricted to the natural address class mask.
6. Set the following parameters:
• Import AS Extern
• NSSA Translate
• NSSA Originate Def Route
• NSSA Propagate Def Route
• NSSA Def Route Type
• Stub Default Metric
• Import Summaries
Click on Help or see the parameter
descriptions beginning on page A-50.
7. Click on Apply, and then click on Done. You return to the Configuration Manager
window.
Site Manager Procedure
(continued)
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