Re: OSPF quiz

As someone I respected put it many times, food for thought.
Great links Petr.
-Carlos

Petr Lapukhov @ 31/05/2011 18:50 -0300 dixit:
> Carlos,
>
> It could be interesting to compare this behavior to the way other
> protocol treat 3rd party next-hops. Also, try figuring the process that
> OSPF uses when picking up an FA for NSSA prefixes. A while ago I wrote a
> few summaries on the 3rd party NHops processing in different routing
> protocols, hope it might be helpful still:
>
> http://blog.ine.com/2010/09/02/understanding-third-party-next-hop/
> http://blog.ine.com/2009/11/13/ospf-prefix-filtering-using-forwarding-address/
>
> Look into that NSSA FA selection process, it might be amusing :)
>
> Regards,
>
> --
> Petr Lapukhov, petr_at_INE.com
> CCIE #16379 (R&S/Security/SP/Voice)
> CCDE #20100007
>
> Internetwork Expert, Inc.
> http://www.INE.com
> Toll Free: 877-224-8987
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>
> 2011/5/31 Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
>
> Just wanted to share a small quiz. Try to answer w/o labbing this up.
>
> Topology: Central site with a firewall connected by a lan to two
> borders (B1 and B2) using HSRP for DG (FHRP). Borders run serial
> links to
> branches. OSPF single area in the WAN.
>
> B1 and B2 have a static route to an internal network X poining to the
> FW. B1 redidtributes X with metric 20 metric type 1. B2 does the same
> thing with metric 50.
>
> At a branch,, how many routes do you see, assuming same bandwidth on
> both serial links ?
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
> LW7 EQI Argentina
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net