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Which OSPF areas prevent LSA type 4, LSA type 5?

Which OSPF areas prevent LSA type 4, LSA type 5?
A. Not-so-stubby area
B. Total stubby area
C. Stubby area
D. Normal area
E. Backbone area
F. Not-so-stubby totally stub area

 

Required the detail explaintion regarding the answer.

2 ACCEPTED SOLUTIONS

Accepted Solutions
VIP Advisor

Re: Which OSPF areas prevent LSA type 4, LSA type 5?

Hi there,

Stub and Totally Stubby Areas meet that requirement. Take a look at these two sources:

 

https://tools.ietf.org/html/rfc2328#page-37

https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html#t31

 

cheers,

Seb.

VIP Advocate

Re: Which OSPF areas prevent LSA type 4, LSA type 5?

Hi,

Stub areas can contain type 1, 2, and 3 LSAs. A default route is substituted for external routes.
Totally stubby areas can only contain type 1 and 2 LSAs, and a single type 3 LSA. The type 3 LSA describes a default route, substituted for all external and inter-area routes.
Not-so-stubby-areas implement stub or totally stubby functionality yet contain an ASBR. Type 7 LSAs generated by the ASBR are converted to type 5 by ABRs to be flooded to the rest of the OSPF domain.

Not-so-stubby totally stub area

 

This Table can help you more:
LSA-table.png

 

 

 

 

 

 

Regards,

Deepak Kumar

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution If this comment will make help you!
5 REPLIES 5
VIP Advisor

Re: Which OSPF areas prevent LSA type 4, LSA type 5?

Hi there,

Stub and Totally Stubby Areas meet that requirement. Take a look at these two sources:

 

https://tools.ietf.org/html/rfc2328#page-37

https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html#t31

 

cheers,

Seb.

VIP Advocate

Re: Which OSPF areas prevent LSA type 4, LSA type 5?

Hi,

Stub areas can contain type 1, 2, and 3 LSAs. A default route is substituted for external routes.
Totally stubby areas can only contain type 1 and 2 LSAs, and a single type 3 LSA. The type 3 LSA describes a default route, substituted for all external and inter-area routes.
Not-so-stubby-areas implement stub or totally stubby functionality yet contain an ASBR. Type 7 LSAs generated by the ASBR are converted to type 5 by ABRs to be flooded to the rest of the OSPF domain.

Not-so-stubby totally stub area

 

This Table can help you more:
LSA-table.png

 

 

 

 

 

 

Regards,

Deepak Kumar

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution If this comment will make help you!

Re: Which OSPF areas prevent LSA type 4, LSA type 5?

Stub and Totally Stubby Areas prevent LSA type 4, LSA type 5.
Please see my simple table below, hope it is helpful (3rd table in this cheatsheet): 

06. OSPF Part3 - CheatSheet ATech ( Waqas Karim ).pngOSPF Cheatsheet


Regards,
Waqas Karim (CCIE)

Re: Which OSPF areas prevent LSA type 4, LSA type 5?


@libra_ali786 wrote:

Which OSPF areas prevent LSA type 4, LSA type 5?
A. Not-so-stubby area
B. Total stubby area
C. Stubby area
D. Normal area
E. Backbone area
F. Not-so-stubby totally stub area

 

Required the detail explaintion regarding the answer.


Stub and Totally Stub Areas


Regards,
Waqas Karim (CCIE)
Beginner

Re: Which OSPF areas prevent LSA type 4, LSA type 5?

Hey

Answer will be STUB  and Totally Stubby Areas ,  NSSA and Total NSSA is not correct bcoz they use type 7 LSA which is actually mask of type 5 LSA 

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