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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> >> >> > >>
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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
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> >> >> >
> >> >> > IPexpert is a premier provider of Self-Study Workbooks, Video on
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> >> for
> >> >> > the Cisco CCIE (R&S, Voice, Security & Service Provider)
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> at
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> >> >>
> >> >>
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> >> >>
> >> >>
> _______________________________________________________________________
> >> >> Subscription information may be found at:
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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
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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

Blogs and organic groups at http://www.ccie.net
Received on Tue Mar 30 2010 - 10:34:58 ART