Re: OSPF SHAM-LINK

sorry i got the PE CE other way ..

CE (router ospf 1 - link area 0 ---- BGP PE - BGP PE ---- CE (router ospf 2
- link area 0)
Ahmed
On Tue, Mar 30, 2010 at 10:34 AM, Ahmed Ejaz <aahmedejaz_at_gmail.com> wrote:

> 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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>> >> 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
>> >> >> > >>
>> >> >> > >>
>> >> >> > >>
>> >> >> > >>
>> >> >> > >>
>> >> >> > >>
>> >> >> > >>
>> >> >> > >
>> >> >> > >
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >> > --
>> >> >> > 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
>> >> >>
>> >> >>
>> _______________________________________________________________________
>> >> >> Subscription information may be found at:
>> >> >> http://www.groupstudy.com/list/CCIELab.html
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >
>> >> > --
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>> >> > 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,
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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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Received on Tue Mar 30 2010 - 10:37:40 ART