ospf LSA's knowledge for ccnp

[netman42]

Does anyone know of a simpler definition of all the link state advertisements type 1-7 so that it can stand out in your mind more clearly. I seem to have problems knowing exactly what they do so therefore I confuse some of them at times.

 

[lui3]

i had the same problem with the LSA types when i got my CCNP. I just wrote them down on a note card and carried them with me all the time to memorize them.


and know i have forgotten them again. go figure. hehe


anyways, you will need to know them by heart for the exam though

 

[Jsteve]

here is the little i remember

LSA 1= (Router Link entry, shown in route table as 'O')flooded within a single area

LSA 2= (Network Link Entry,shown in route table as 'O')Generated br DRs in multi-access systems, that describes the set of routers attached to a particular network.

LSA 3 and 4= (Summary link entry, shown in route table as 'O IA')Originated by ABRs. These entries are flooded throughout the backbone area to the other ABRs.

LSA 5= (AS external entry, shown in route table as 'O E1 – ospf ext. type 1' and 'O E2 – ospf ext. type 2')Originated by ASBRs. Describes routes to destinations external to the AS. Flooded throughout the AS except Stub areas.

LSA 7= (Not-so-stubby area, shown in route table as 'O N1 = ospf NSSA ext. type 1' and 'O N2 = ospf NSSA ext. type 2')Originated by ASBR in a NSSA. Flooded within a NSSA.

 

[Jsteve]

these links may help a little.

http://www.cisco.com/warp/public/104/nssa.html

http://www.cisco.com/warp/public/104/21.html