Re: OSPF SHAM-LINK

In your case you are getting the routes as IA so there can be some other
problem .. please post your configs.

Ahmed.

On Tue, Mar 30, 2010 at 10:39 AM, <ccie_ka_at_gmx.de> wrote:

> So this means I should use the same domain-id on both sides on the PE
> routers ?
>
>
> -------- Original-Nachricht --------
> > Datum: Tue, 30 Mar 2010 10:34:58 +0500
> > Von: Ahmed Ejaz <aahmedejaz_at_gmail.com>
> > An: Joe Astorino <jastorino_at_ipexpert.com>
> > CC: ccie_ka_at_gmx.de, biola_y2k_at_yahoo.com, ccielab_at_groupstudy.com
> > Betreff: Re: OSPF SHAM-LINK
>
> > If you are running seperate process ids on the PE routers then it is
> > better
> > to hardcode it on both sides.
> >
> > i-e
> >
> > PE (router ospf 1 - link area 0 ---- BGP CE - BGP CE ---- PE (router
> ospf
> > 2
> > - link area 0)
> >
> > So in this case you will start getting OE2 routes as the ospf domain-id's
> > don't match. In order to overcome this you can manually specify the same
> > domain ids on both sides.
> >
> > Ahmed.
> >
> > On Tue, Mar 30, 2010 at 10:31 AM, Joe Astorino
> > <jastorino_at_ipexpert.com>wrote:
> >
> > > No no...we are not talking about the RID. The RID and the Domain-ID
> > > are two completely different things : ) To summarize:
> > >
> > > 1) If the domain-id matches on both PE routers you should get O routes
> > > (intra-area)
> > > 2) The domain-id by default is taken from the process id you are
> > > running. Therefore if you have the same process id on both sides you
> > > should have the same domain-id and intra-area routes
> > > 3) If the domain-id does NOT match on both PE routers what you will
> > > see are O E2 routes (external type 2)
> > > 4) You can hard code the domain-id to match in the case where you have
> > > two different process numbers going but still want O routes.
> > >
> > >
> > >
> > > On Tue, Mar 30, 2010 at 1:26 AM, <ccie_ka_at_gmx.de> wrote:
> > > > So normally it should be ok if I hardcoded the router-id ?!
> > > >
> > > >
> > > > -------- Original-Nachricht --------
> > > >> Datum: Tue, 30 Mar 2010 01:25:04 -0400
> > > >> Von: Joe Astorino <jastorino_at_ipexpert.com>
> > > >> An: ccie_ka_at_gmx.de
> > > >> CC: Ahmed Ejaz <aahmedejaz_at_gmail.com>, ccielab_at_groupstudy.com,
> > > biola_y2k_at_yahoo.com
> > > >> Betreff: Re: OSPF SHAM-LINK
> > > >
> > > >> You can hard code the OSPF domain-id under the OSPF process if you
> > > >> wish. The command is simply "domain-id" under the process.
> > > >>
> > > >>
> > > >>
> > > >> On Tue, Mar 30, 2010 at 1:23 AM, <ccie_ka_at_gmx.de> wrote:
> > > >> > Currently I don't have access to my lab but I also mean the domain
> > ID
> > > is
> > > >> the same as the router ID if this is hardcoded on both sides
> > > >> >
> > > >> >
> > > >> > -------- Original-Nachricht --------
> > > >> >> Datum: Tue, 30 Mar 2010 10:16:34 +0500
> > > >> >> Von: Ahmed Ejaz <aahmedejaz_at_gmail.com>
> > > >> >> An: Joe Astorino <jastorino_at_ipexpert.com>
> > > >> >> CC: Abiola Jewoola <biola_y2k_at_yahoo.com>, ccielab_at_groupstudy.com
> > > >> >> Betreff: Re: OSPF SHAM-LINK
> > > >> >
> > > >> >> Thats correct Joe, thanks for the correction.
> > > >> >>
> > > >> >> On Tue, Mar 30, 2010 at 10:13 AM, Joe Astorino
> > > >> >> <jastorino_at_ipexpert.com>wrote:
> > > >> >>
> > > >> >> > I believe if you are using the same OSPF process ID on both
> > sides,
> > > >> you
> > > >> >> > should get O routes. I am pretty sure the domain-ID by default
> > is
> > > >> >> > taken from the process ID number you are running. If they were
> > > >> >> > different domain IDs though, you should be seeing O E2 routes
> so
> > > that
> > > >> >> > is why I say it is a bit strange.
> > > >> >> >
> > > >> >> >
> > > >> >> >
> > > >> >> > On Tue, Mar 30, 2010 at 12:57 AM, Ahmed Ejaz
> > <aahmedejaz_at_gmail.com
> > > >
> > > >> >> wrote:
> > > >> >> > > I guess the ospf process which you are redistributing into
> bgp
> > > >> >> requires a
> > > >> >> > > domain id, that is the reason it is treating it as an IA
> > route.
> > > >> Please
> > > >> >> > add a
> > > >> >> > > domain id on both the sides and the routes should come up as
> O
> > > >> routes
> > > >> >> > then
> > > >> >> > > you can modify the cost to not prefer the sham link.
> > > >> >> > >
> > > >> >> > > HTH
> > > >> >> > > Ahmed
> > > >> >> > >
> > > >> >> > > On Tue, Mar 30, 2010 at 7:43 AM, Joe Astorino
> > > >> <jastorino_at_ipexpert.com>
> > > >> >> > > wrote:
> > > >> >> > >>
> > > >> >> > >> OSPF routes coming over the sham-link should be regular O
> > routes
> > > >> >> > >> (intra-area) and thus should be preferred over O IA
> > > routes...post
> > > >> >> your
> > > >> >> > >> configurations something does not seem right about that.
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >> On Mon, Mar 29, 2010 at 10:35 PM, Abiola Jewoola
> > > >> >> <biola_y2k_at_yahoo.com>
> > > >> >> > >> wrote:
> > > >> >> > >> > Hello G.S
> > > >> >> > >> >
> > > >> >> > >> > How can i make ospf prefer to forward route routes via
> > ospf
> > > >> >> > sham-link.
> > > >> >> > >> > The
> > > >> >> > >> > sham link has has a cost of 10 and the routes are coming
> as
> > IA
> > > >> >> routes
> > > >> >> > >> > across
> > > >> >> > >> > the MPLS backbone
> > > >> >> > >> >
> > > >> >> > >> > The router is preferring the backdoor link even when i
> have
> > > >> >> increased
> > > >> >> > >> > the cost
> > > >> >> > >> > as high as 65000. The routes are also advertised as IA
> > routes.
> > > >> >> > >> >
> > > >> >> > >> > Regards,
> > > >> >> > >> > Abiola
> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> > >> > Blogs and organic groups at http://www.ccie.net
> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> >
> > > >>
> > _______________________________________________________________________
> > > >> >> > >> > Subscription information may be found at:
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> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> > >> >
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >> --
> > > >> >> > >> Regards,
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >> Joe Astorino - CCIE #24347
> > > >> >> > >> Sr. Technical Instructor - IPexpert
> > > >> >> > >> Mailto: jastorino_at_ipexpert.com
> > > >> >> > >> Telephone: +1.810.326.1444
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> > > >> >> > >> Blogs and organic groups at http://www.ccie.net
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> > > _______________________________________________________________________
> > > >> >> > >> Subscription information may be found at:
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> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >>
> > > >> >> > >
> > > >> >> > >
> > > >> >> >
> > > >> >> >
> > > >> >> >
> > > >> >> > --
> > > >> >> > Regards,
> > > >> >> >
> > > >> >> >
> > > >> >> >
> > > >> >> > Joe Astorino - CCIE #24347
> > > >> >> > Sr. Technical Instructor - IPexpert
> > > >> >> > Mailto: jastorino_at_ipexpert.com
> > > >> >> > Telephone: +1.810.326.1444
> > > >> >> > Live Assistance, Please visit: www.ipexpert.com/chat
> > > >> >> > eFax: +1.810.454.0130
> > > >> >> >
> > > >> >> > IPexpert is a premier provider of Self-Study Workbooks, Video
> on
> > > >> >> > Demand, Audio Tools, Online Hardware Rental and Classroom
> > Training
> > > >> for
> > > >> >> > the Cisco CCIE (R&S, Voice, Security & Service Provider)
> > > >> >> > certification(s) with training locations throughout the United
> > > >> States,
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> > > >> >> > communities at www.ipexpert.com/communities and our public
> > website
> > > at
> > > >> >> > www.ipexpert.com
> > > >> >>
> > > >> >>
> > > >> >> Blogs and organic groups at http://www.ccie.net
> > > >> >>
> > > >> >>
> > > _______________________________________________________________________
> > > >> >> Subscription information may be found at:
> > > >> >> http://www.groupstudy.com/list/CCIELab.html
> > > >> >>
> > > >> >>
> > > >> >>
> > > >> >>
> > > >> >>
> > > >> >>
> > > >> >
> > > >> > --
> > > >> > GRATIS f|r alle GMX-Mitglieder: Die maxdome Movie-FLAT!
> > > >> > Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
> > > >> >
> > > >>
> > > >>
> > > >>
> > > >> --
> > > >> Regards,
> > > >>
> > > >>
> > > >>
> > > >> Joe Astorino - CCIE #24347
> > > >> Sr. Technical Instructor - IPexpert
> > > >> Mailto: jastorino_at_ipexpert.com
> > > >> Telephone: +1.810.326.1444
> > > >> Live Assistance, Please visit: www.ipexpert.com/chat
> > > >> eFax: +1.810.454.0130
> > > >>
> > > >> IPexpert is a premier provider of Self-Study Workbooks, Video on
> > > >> Demand, Audio Tools, Online Hardware Rental and Classroom Training
> > for
> > > >> the Cisco CCIE (R&S, Voice, Security & Service Provider)
> > > >> certification(s) with training locations throughout the United
> > States,
> > > >> Europe, South Asia and Australia. Be sure to visit our online
> > > >> communities at www.ipexpert.com/communities and our public website
> at
> > > >> www.ipexpert.com
> > > >
> > > > --
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> > > >
> > >
> > >
> > >
> > > --
> > > Regards,
> > >
> > >
> > >
> > > Joe Astorino - CCIE #24347
> > > Sr. Technical Instructor - IPexpert
> > > Mailto: jastorino_at_ipexpert.com
> > > Telephone: +1.810.326.1444
> > > Live Assistance, Please visit: www.ipexpert.com/chat
> > > eFax: +1.810.454.0130
> > >
> > > IPexpert is a premier provider of Self-Study Workbooks, Video on
> > > Demand, Audio Tools, Online Hardware Rental and Classroom Training for
> > > the Cisco CCIE (R&S, Voice, Security & Service Provider)
> > > certification(s) with training locations throughout the United States,
> > > Europe, South Asia and Australia. Be sure to visit our online
> > > communities at www.ipexpert.com/communities and our public website at
> > > www.ipexpert.com
> > >
>
> --
> GRATIS f|r alle GMX-Mitglieder: Die maxdome Movie-FLAT!
> Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01

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Received on Tue Mar 30 2010 - 10:40:52 ART