Re: OSPF SHAM-LINK

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
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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)
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>> States,
>> >> > Europe, South Asia and Australia. Be sure to visit our online
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>> >>
>> >>
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>> >>
>> >> _______________________________________________________________________
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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
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>> 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
Blogs and organic groups at http://www.ccie.net