LSA Type 4 again

Experts,

Jeff Doyle says LSA type 4 is allowed in nssa area ( see table below). I
would have thought that since LSA 5 is not permitted then no need to
generate LSA 4.

My understanding is , ABR generates LSA 4 based on the type 5, to describe
the position of the ASBR.

Or am I missing something here?

I have also seen this in Quick Reference Sheet by Anthony Sequeira.

  Table 8-5. LSA types allowed per area type.

Area Type

1&2

3

4

5

7

Backbone (area 0)

Yes

Yes

Yes

Yes

No

Non-backbone, non-stub

Yes

Yes

Yes

Yes

No

Stub

Yes

Yes

No

No

No

Totally stubby

Yes

No[*]<mk:@MSITStore:C:\Documents%20and%20Settings\user\Desktop\R&S%20CCIE\Recommended%20Reading\Books\Cisco%20press\Jeff%20Doyle\CCIE_Professional_Development_Routing_TCPIP,_Volume_I,_Second_Edition.chm::/1587052024/ch08lev1sec1.html#ch08tn01>

No

No

No

Not-so-stubby

Yes

Yes

Yes

No

Yes

 [*] Except for a single type 3 LSA per ABR, advertising the default route

Regards,

Molomo

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Received on Sun Sep 06 2009 - 16:27:47 ART