Re: OSPF Sham Links?

Nope, it's not running on the Loopback, no OSPF network statement and
no ospf config under the interface...

On Tue, Mar 23, 2010 at 7:43 PM, <jastorino_at_ipexpert.com> wrote:
> Is OSPF running on the loopback?
>
>
> Sent from my Verizon Wireless BlackBerry
>
> Regards,
>
>
>
> Joe Astorino - CCIE #24347 (Earned not bought)
> Sr. Technical Instructor - IPexpert
> Mailto: jastorino_at_ipexpert.com
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> -----Original Message-----
> From: Group Study <gs_at_netengineer.org>
> Date: Tue, 23 Mar 2010 19:41:22
> To: <jastorino_at_ipexpert.com>
> Cc: CCIE Groupstudy<ccielab_at_groupstudy.com>
> Subject: Re: OSPF Sham Links?
>
> Nope, not doing a redistribute connected.
>
> I'm redistributing ospf 1 vrf XYZ int bgp's ipv4 vrf XYZ and vice
> versa but not redistributing anything else, including connected.
>
>
>
>
> On Tue, Mar 23, 2010 at 7:37 PM, <jastorino_at_ipexpert.com> wrote:
>> OK. So obviously it is getting into BGP somehow.
>>
>> Are you sure you are not redist connected or something
>>
>>
>> ------Original Message------
>> From: Group Study
>> To: Joe Astorino
>> Cc: CCIE Groupstudy
>> Subject: Re: OSPF Sham Links?
>> Sent: Mar 23, 2010 7:11 PM
>>
>> Joe,
>>
>> I saw this link too... The funny thing is, I'm not advertising the
>> Loopbacks for the Sham link anywhere... It's just in a vrf, I didn't
>> specify the network for the loopbacks under ospf nor did I advertise
>> it in BGP....
>>
>> Weird...
>>
>> Any thoughts on R3 knows of R4s loopback for the sham link? It shows
>> up as an iBGP route in the vrf routing table... but I don't know how
>> it got there...
>>
>>
>>
>>
>> On Tue, Mar 23, 2010 at 7:01 PM, Joe Astorino <jastorino_at_ipexpert.com> wrote:
>>> HI!
>>>
>>> I believe the way that is supposed to work is that you advertise your
>>> newly created loopbacks into BGP. Please see the following link:
>>>
>>> http://www.cisco.com/en/US/docs/ios/12_2t/12_2t8/feature/guide/ospfshmk.html#wp1035280
>>>
>>>
>>>
>>> On Tue, Mar 23, 2010 at 6:47 PM, Group Study <gs_at_netengineer.org> wrote:
>>>> I'm doing an MPLS lab on OSPF Sham links and I'm a bit confused.
>>>>
>>>> On my two PEs, R3 and R4, I create a loopback each and then put them
>>>> into a VRF but I'm not putting these interfaces or host subnets into a
>>>> routing protocol. R3 and R4 have 2 P routers in between them that are
>>>> speaking ISIS as the IGP and R3 and R4 are MP-BGP (iBGP) peers. R3 is
>>>> also connected SW2 (CE) and R4 is connected to R6 (CE) and they have a
>>>> backdoor link connected to each other. The CE-PE protocol is OSPF.
>>>>
>>>> How does R3 know about the Loopback of R4, the destination of the OSPF
>>>> Sham link and vice versa?
>>>>
>>>>
>>>> Blogs and organic groups at http://www.ccie.net
>>>>
>>>>_______________________________________________________________________
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Regards,
>>>
>>>
>>>
>>> Joe Astorino - CCIE #24347 (Earned not bought)
>>> 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
>>>
>>
>>
>> Sent from my Verizon Wireless BlackBerry
>>
>> Regards,
>>
>>
>>
>> Joe Astorino - CCIE #24347 (Earned not bought)
>> 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 23 2010 - 19:49:07 ART