Re: OSPF SHAM-LINK

I agree with you Carlos. The reason it went off-list in the first
place is because the proper details were not given. When I asked for
them I was unicasted and we just continued along the way.

On Sat, Apr 3, 2010 at 8:44 AM, Carlos G Mendioroz <tron_at_huapi.ba.ar> wrote:
> Not particular for this one case, but solving problems that are exposed
> to the list and not sharing the solution seems not a polite behaviour IMHO.
>
> It is my experience that people are cought by the same issues once and
> again, and it is enlightening to read those experiences, and learn from
> the whole thing.
>
> I've read many times directions to use the list search capabilities.
> This is useless if the end of the story is not there...
>
> -Carlos
>
> Joe Astorino @ 3/04/2010 5:39 -0300 dixit:
>> That is always a good thing : ) glad I could make somebody's day a bit more exciting hehe
>>
>>
>> Sent from my Verizon Wireless BlackBerry
>>
>> 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
>>
>> -----Original Message-----
>> From: Jeferson Guardia <jefersonf_at_gmail.com>
>> Date: Sat, 3 Apr 2010 13:45:31
>> To: Joe Astorino<jastorino_at_ipexpert.com>
>> Cc: Bryan Bartik<bbartik_at_ipexpert.com>; Abiola Jewoola<biola_y2k_at_yahoo.com>; Ahmed Ejaz<aahmedejaz_at_gmail.com>; <ccielab_at_groupstudy.com>
>> Subject: Re: OSPF SHAM-LINK
>>
>> Joe,
>>
>> I was next to Abiola (the same room) when you were working with him, when
>> he did what you suggested and worked,
>> he was clapping and celebrating very loud, well done mate! :)
>>
>>
>> 2010/4/3 Joe Astorino <jastorino_at_ipexpert.com>
>>
>>> I am pretty sure this is resolved -- Abiola and I took it off list and
>>> got into the specific diagram / topology. Correct me if I'm wrong
>>> Abiola.
>>>
>>> On Fri, Apr 2, 2010 at 10:44 AM, Bryan Bartik <bbartik_at_ipexpert.com>
>>> wrote:
>>>> Abiola,
>>>>
>>>> Can you diagram what you have? Perhaps there is something else wrong.
>>> When
>>>> you shut the backdoor link down, does the route become accessible over
>>> the
>>>> mpls vpn link?
>>>>
>>>> On Tue, Mar 30, 2010 at 7:24 AM, Abiola Jewoola <biola_y2k_at_yahoo.com>
>>> wrote:
>>>>> The whole idea is to make the sham-link preferable.
>>>>>
>>>>> The existing design is the the sites are in different ospf areas .
>>>>>
>>>>> like u said, if the ospf routes from both the mpls link and ospf are
>>>>> coming
>>>>> as IA we can tweak the cost.
>>>>> That has been done and the routes still prefers to go via the ospf link
>>>>> even
>>>>> after a very high cost.
>>>>>
>>>>>
>>>>>
>>>>> --- On Tue, 3/30/10, Joe Astorino <jastorino_at_ipexpert.com> wrote:
>>>>>
>>>>> From: Joe Astorino <jastorino_at_ipexpert.com>
>>>>> Subject: Re: OSPF SHAM-LINK
>>>>> To: "Abiola Jewoola" <biola_y2k_at_yahoo.com>
>>>>> Cc: "Ahmed Ejaz" <aahmedejaz_at_gmail.com>, ccielab_at_groupstudy.com
>>>>> Date: Tuesday, March 30, 2010, 3:09 AM
>>>>>
>>>>> Abiola,
>>>>>
>>>>> To summarize here -- If you have site 1 and site 2 linked up via MPLS
>>> and
>>>>> also
>>>>> via a backdoor link and both sites are in different areas then there is
>>> no
>>>>> need to use a sham link in the first place. Both the backdoor and mpls
>>>>> routes
>>>>> will be O IA and you can simply tweak cost.
>>>>>
>>>>> Now, if you have site 1 and site 2 and they are both in the same area
>>> then
>>>>> you
>>>>> have a problem because the mpls learned routes will still show up as O
>>> IA
>>>>> at
>>>>> best, and the backdoor link will always be preferred. If you are saying
>>>>> that
>>>>> you have separate sites here then forget about the sham link and lets
>>>>> focus on
>>>>> manipulating the OSPF cost to get things to route the way you'd like.
>>>>>
>>>>>
>>>>>
>>>>> On Tue, Mar 30, 2010 at 5:46 AM, Joe Astorino <jastorino_at_ipexpert.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>> Make both CE sites the same OSPF area
>>>>>
>>>>> On Tue, Mar 30, 2010 at 5:44 AM, Abiola Jewoola <biola_y2k_at_yahoo.com>
>>>>> wrote:
>>>>>
>>>>> Yea,
>>>>>
>>>>> My sham is link up from both sides from the show ip ospf sham-link
>>> output
>>>>> a
>>>>>
>>>>> And full from the show ip ospf nei output!
>>>>>
>>>>>
>>>>>
>>>>> --- On Tue, 3/30/10, Joe Astorino <jastorino_at_ipexpert.com> wrote:
>>>>>
>>>>> From: Joe Astorino <jastorino_at_ipexpert.com>
>>>>> Subject: Re: OSPF SHAM-LINK
>>>>> To: "Abiola Jewoola" <biola_y2k_at_yahoo.com>
>>>>>
>>>>>
>>>>>
>>>>> Cc: "Ahmed Ejaz" <aahmedejaz_at_gmail.com>, ccielab_at_groupstudy.com
>>>>> Date: Tuesday, March 30, 2010, 2:38 AM
>>>>>
>>>>> Are you sure your sham-link is actually working? It doesn't sound like
>>> it
>>>>> is. If the sham-link was up you would have intra-area O routes here.
>>>>> Take a
>>>>> look at "sh ip ospf neighbor". Do you see an adjacency over
>>>>> the sham-link?
>>>>>
>>>>> On Tue, Mar 30, 2010 at 3:46 AM, Joe Astorino <jastorino_at_ipexpert.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Post your configurations
>>>>>
>>>>> On Tue, Mar 30, 2010 at 2:43 AM, Abiola Jewoola <biola_y2k_at_yahoo.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> I had already increased the cost of the back door link very high.
>>>>>
>>>>> Still the ospf is preferring to go through the back door link
>>>>>
>>>>>
>>>>> --- On Mon, 3/29/10, Joe Astorino <jastorino_at_ipexpert.com> wrote:
>>>>>
>>>>> From: Joe Astorino <jastorino_at_ipexpert.com>
>>>>> Subject: Re: OSPF SHAM-LINK
>>>>> To: "Abiola Jewoola" <biola_y2k_at_yahoo.com>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Cc: "Ahmed Ejaz" <aahmedejaz_at_gmail.com>, ccielab_at_groupstudy.com
>>>>>
>>>>>
>>>>>
>>>>> Date: Monday, March 29, 2010, 11:10 PM
>>>>>
>>>>> Ahhh...yes well then that is a different story. Typically we see both
>>>>> remote sites configured for area 0. In your case if both the backdoor
>>>>> link
>>>>> and the sham-link learned routes are O IA all you should need to do is
>>>>> tweak
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> the OSPF metric
>>>>> by manipulating cost where necessary. Just remember
>>>>> that
>>>>> cost is calculated by adding in the cost of your inbound link.
>>>>>
>>>>> On Tue, Mar 30, 2010 at 1:39 AM, Abiola Jewoola <biola_y2k_at_yahoo.com>
>>>>> wrote:
>>>>>
>>>>>>
>>>>>> Find attached the configs on my PE routers.
>>>>>>
>>>>>> The process id is the same and i also include the same domain-id . but
>>>>>> the
>>>>>> routes still comes as IA. i guess because the PE routers area pairing
>>>>>> with
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> CE routers with different areas.
>>>>>>
>>>>>>
>>>>>>
>>>>>> --- On *Mon, 3/29/10, Ahmed Ejaz <aahmedejaz_at_gmail.com>* wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> From: Ahmed Ejaz <aahmedejaz_at_gmail.com>
>>>>>>
>>>>> Subject: Re: OSPF SHAM-LINK
>>>>>> To: "Joe Astorino" <jastorino_at_ipexpert.com>
>>>>>> Cc: "Abiola Jewoola" <biola_y2k_at_yahoo.com>, ccielab_at_groupstudy.com
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Date: Monday, March 29, 2010, 9:57 PM
>>>>>>
>>>>>>
>>>>>> 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@ipexpert.com<http://mc/compose?to=jastorino@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@yahoo.com<http://mc/compose?to=biola_y2k@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:
>>>>>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>> >
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Regards,
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Joe Astorino - CCIE #24347
>>>>>>> Sr. Technical Instructor - IPexpert
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>> Mailto:
>>>>> jastorino@ipexpert.com<http://mc/compose?to=jastorino@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
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Bryan Bartik
>>>> CCIE #23707 (R&S, SP), CCNP
>>>> Sr. Support Engineer - IPexpert, Inc.
>>>> URL: http://www.IPexpert.com <http://www.ipexpert.com/>
>>>>
>>>
>>>
>>> --
>>> 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
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>

-- 
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