RE: OSPF SHAM LINKS

Thank you all for the valuable information.But my question is: Do we need Sham
link if we already have inter-area:

R1---MPBGP--------R2
  | | | |OSPF Area 1
OSPF Area 2 | | | |R3--Ospf
area 0----R4

I tried scenario above on GNS and I didn't see any difference, before and
after using sham links.R4 can see R3 through mpls as Inter-area without sham
links.
So do we need it here for any reason?maybe as design for super backbone area
0?

> Date: Thu, 3 Feb 2011 11:37:15 -0800
> Subject: Re: OSPF SHAM LINKS
> From: narbikk_at_gmail.com
> To: hussamkibbi_at_hotmail.com
> CC: ccielab_at_groupstudy.com
>
> Just to add to whats been said here....
> You could actually configure Sham-link for back door and GRE through the
> cloud for "O" routes, these are some of your options, it all depends what
> you like to do.
>
> On Thu, Feb 3, 2011 at 9:18 AM, Hussam EL Kebbi
<hussamkibbi_at_hotmail.com>wrote:
>
> > Hi Experts,
> > Do we need Sham-links between OSPF Inter area (then MPBGP) having same
> > domain-id?
> > or it is only needed to keep the intra area routes as Intra area routes?
> >
> > Thanks,
> >
> >
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> --
> *Narbik Kocharians
> *CCSI#30832, CCIE# 12410 (R&S, SP, Security)
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Received on Fri Feb 04 2011 - 00:48:45 ART