Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Instrukcja Użytkownika Strona 235

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Customizing OSPF Services
308627-14.20 Rev 00
6-51
Using Site Manager
To configure an OSPF stub area, complete the following tasks:
Configuring a Not-So-Stubby Area (NSSA)
An OSPF not-so-stubby area (NSSA) is similar to an OSPF stub area except that,
to a limited degree, an NSSA can import AS external routes. Like a stub area, an
NSSA consumes less memory and CPU resources by preventing the flooding of
AS external link state advertisements (LSAs) into the area and by using default
routing to external destinations. Unlike a stub area, however, an NSSA can import
external routes into an OSPF routing domain.
You can enable routers in an NSSA to advertise external routing information to
other OSPF areas. To do this, you configure an announce policy on each NSSA
internal router to set the P-bit (propagate bit) in the type 7 advertisement. (In Site
Manager, set the OSPF NSSA Propagate parameter to Enable. In the BCC, set the
nssa-propagate
parameter to
enabled
.) For instructions, see Defining an OSPF
Announce Policy on page 6-70. Only those LSAs with the P-bit set will be
translated by the NSSA border router and therefore advertised into other areas.
Site Manager Procedure
You do this System responds
1. In the Configuration Manager window,
choose Protocols.
The Protocols menu opens.
2. Choose IP. The IP menu opens.
3. Choose OSPF/MOSPF. The OSPF/MOSPF menu opens.
4. Choose Areas. The OSPF Areas window opens.
5. Click on the area that you want to edit. The parameter values for that area
appear in the OSPF Areas window.
6. Set the following parameters:
Import AS Extern
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.
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