Re: OSPF SHAM-LINK

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
> > >> >> > >> >
> > >> >> > >> >
> > >> >> >
> > >>
> _______________________________________________________________________
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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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> > >> at
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> > >> >> > >>
> > >> >> > >>
> > >> >> > >> Blogs and organic groups at http://www.ccie.net
> > >> >> > >>
> > >> >> > >>
> > >> >>
> > _______________________________________________________________________
> > >> >> > >> Subscription information may be found at:
> > >> >> > >> http://www.groupstudy.com/list/CCIELab.html
> > >> >> > >>
> > >> >> > >>
> > >> >> > >>
> > >> >> > >>
> > >> >> > >>
> > >> >> > >>
> > >> >> > >>
> > >> >> > >
> > >> >> > >
> > >> >> >
> > >> >> >
> > >> >> >
> > >> >> > --
> > >> >> > 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
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> > >> >> > communities at www.ipexpert.com/communities and our public
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> > 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
> > >> >>
> > >> >>
> > >> >>
> > >> >>
> > >> >>
> > >> >>
> > >> >
> > >> > --
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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
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> for
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> > >
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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
> >

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