OSPF Authentication

Written by admin. Posted in OSPF

By the use of OSPF authentication you can prevent unwanted routing updates from being received and processed by the routers. If authentication is configured on a router, it will authenticate the source of each OSPF packet by using a password, which is known by both routers. 

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OSPF external route summarization

Written by admin. Posted in OSPF

OSPF external route summarization

External routes in OSPF are carried by type 5 LSA (external LSAs). Type 5 LSAs are generated by ASBR (Autonomous System Boundary Router), that’s why external route summarization must be configured on ASBR. Stub area do not allow ASBR because they don’t allow type 5 LSAs.

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OSPF internal route summarization

Written by admin. Posted in OSPF

OSPF internal route summarization

OSPF does not support auto summarization, only manual. OSPF route summarization can be of two types:

  1. Internal route summarization;
  2. External route summarization.

 In this article we will work with OSPF internal route summarization on Cisco routers.

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OSPF default route

Written by admin. Posted in OSPF

Using a default route will save router’s resources because there is no need to run SPF algorithm each time when external network changes occur. In this lab we will examine how to propagate a default route in an OSPF standard area.

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Redistribution into OSPF

Written by admin. Posted in OSPF

redistribution into ospf

Here I will show you on Cisco Routers how to do redistribution of routes into OSPF from EIGRP. After you read this article you may want to check one more where I showed how to configure route redistribution into EIGRP. There are similarities and differences when compared to EIGRP redistribution.

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