Fw: OSPF Type 4 LSA --only when there is O E1 routes ?

Is this true?

Type 4 LSA?s are generated by ABRs that have an ASBR in
an area it
touches. The Type 4 LSA is created by the ABR to describe the
ASBR and
its costs to reach it. Type 4 LSA?s are used when an ASBR is
redistributing type-1 external routes (E1), which helps routers in other
areas calculate the exact metric to reach the external route. If the ASBR
is only redistributing type-2 external routes (E2), no Type 4 LSA will be
generated by an ABR.

This is from a blog.

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Received on Sat Apr 04 2009 - 09:35:53 ART