This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

CCIE #29033

This blog will continue to include questions, troubleshooting scenarios, and references to existing and new technologies but will grow to include a variety of different platforms and technologies. Currently I have created over 185 questions/answers in regards to the CCIE R&S track!! Note: answers are in the comment field or within "Read More" section.

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Sunday, May 9, 2010

Question 77

What are the LSA types supported?
Describe each of them.

LSA Types supported include:

-LSA Type 1 - Router LSA:  used by all routers in an area and includes all link information from that router
-LSA Type 2 - Network LSA: used by the DR (Designated Router) and advertise links from all routers in the area
-LSA Type 3 - Summary LSA: used by the ABR (Area Border Router) to advertise the networks within the respective area. You can summarize at the ABR as well.
-LSA Type 4 - ASBR Summary LSA: This is used to take type 5 LSA's and convert them to type 4 LSA's. This is used to ensure the next hop address to the area where the type 5 originated is known in the adjacent areas
-LSA Type  5 - External LSA: used to identify routes redistributed into an area
-LSA Type 7 - Used in NSSA to identify routes redistributed into the NSSA.

Here is a diagram that I found that is helpful in understanding the different LSA types



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