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

Thatz right. I labbed this up and found that -

Irrespective of E1 or E2 routes, LSA Type 4 was always flooded by the ABR.

-Naveen.

On Fri, Apr 3, 2009 at 11:29 PM, Styran <styran_at_gmail.com> wrote:

> Hi,
>
> No its not. Type 4 LSAs are generated regardless of whether it is E1 or E2
> route.
>
> The E1 or E2 route only determines whether external metric is used or both
> external and internal metrics are used.
>
>
> Lejoe
>
> On Sat, Apr 4, 2009 at 4:35 PM, Thameem Maranveetil Parambath <
> tparamba_at_thecontactcentre.ae> wrote:
>
> > 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 Fri Apr 03 2009 - 23:38:21 ART