Re: OSPF Sham Links?

You are quite welcome : )

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
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-----Original Message-----
From: Group Study <gs_at_netengineer.org>
Date: Tue, 23 Mar 2010 20:23:35
To: <jastorino_at_ipexpert.com>
Cc: CCIE Groupstudy<ccielab_at_groupstudy.com>
Subject: Re: OSPF Sham Links?

Really weird... I re-labbed it again, and now I can't recreate the
same issue... the Sham link won't come up (which should've been the
result since those to subnets (the 2 loopbacks) don't have
reachability to each other.

So I redistributed connected under the ipv4 vrf in bgp and it works...
Maybe I'm just losing my mind :)

Thanks Joe for entertaining my insanity... :)

On Tue, Mar 23, 2010 at 7:49 PM, Group Study <gs_at_netengineer.org> wrote:
> 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
>> 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: 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
>>>>>
>>>>>_______________________________________________________________________
>>>>> Subscription information may be found at:
>>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> 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 Wed Mar 24 2010 - 01:16:23 ART