From: Richard Gallagher (rgallagh@xxxxxxxxx)
Date: Fri Mar 02 2001 - 05:45:30 GMT-3
I would say that "a" is the correct answer, double checking in "Routing TCP/IP,
Jeff Doyle" on pg 490:
"Path types are prioritised in the following order:
1: Intra-area
2: Inter-area
3: E1 exteranl
4: E2 external"
Rich
On Mar 2, 9:41am, Nigel Taylor chatted about:
> Subject:Re: Friday Follies Returns - OSPF route preference
> Chuck,
> Right of when looking at the question and knowing that ospf with
> a AD of 110 uses external-type 2(E2) as it default metric-type on
> redistribution. Also, in noting the difference between;
>
> a) E1 (ext type 1) - Which uses a defined/default cost at redistribution to
> the ASBR (entry point into the process routing domain) plus any cost(of the
> outgoing interface) to it's destination.
>
> b) E2 (ext. type 2) - Which uses a defined/default cost at redistribution to
> the ASBR (entry point into the process routing domain) without the
> additional(internal) cost to it's destination.
>
> Ospf also will use a E2 defined route before a E1 defined route as the ospf
> process defines E2 routes with a higher degree of preference. Also noting
> that with both E1 and E2 routes the process itself still has an AD of
> 110(unlike eigrp which uses a ext route AD of 170) with the default metric
> of 20 for E2 routes.
>
> My answer: b
>
> Although I'm guessing based on your last statement that it's probably (a).
> I'm off to read/scan Howard's paper on CZone. It is very possible that
> Howard has some information in his paper not found on the DOC CD.
>
> Without doing any research, the only thing that comes to mind is "forwarding
> metrics" on the assigned routes.
>
> I've I been mislead all this time.
>
> Nigel.
>
>
> ----- Original Message -----
> From: Chuck Larrieu <chuck@cl.cncdsl.com>
> To: CCIE_Lab Groupstudy List <ccielab@groupstudy.com>
> Sent: Friday, March 02, 2001 1:06 AM
> Subject: Friday Follies Returns - OSPF route preference
>
>
> > A less fun reprise of my once famous Friday Follies questions:
> >
> > Given the following information, which route will ospf prefer, and
> therefore
> > place into the routing table?
> >
> > a) E1 ( external type 1 ) with a cost of 84
> > b) E2 ( external type 2 ) with a cost of 20
> >
> > For extra credit - why?
> > ( I don't know either and I can't find a good explanation on the doc CD )
> > ( but this time I have traces and captures to prove the point )
> >
> > Chuck
> > ----------------------
> > I am Locutus, a CCIE Lab Proctor. Xx_Brain_dumps_xX are futile. Your life
> as
> > it has been is over ( if you hope to pass ) From this time forward, you
> will
> > study US!
> > ( apologies to the folks at Star Trek TNG )
> >
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