
Configuring IP, ARP, RARP, RIP, and OSPF Services
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308627-14.20 Rev 00
Configuring External Route Preference
By default, when OSPF receives multiple AS external LSAs for the same
destination, OSPF applies the preference rules specified by RFC 1583 (superseded
by RFC 2178).
You can use Site Manager to configure OSPF to apply the preference rules
specified by RFC 2178. These rules are designed to prevent routing loops when
AS external LSAs for the same destination originate from different 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 Global. The Edit OSPF Global Parameters
window opens.
5. Set the RFC 1583 Compatibility Enable
parameter. Click on Help or see the
parameter description on page A-40.
6. Click on OK. You return to the Configuration Manager
window.
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