Re: BGP to OSPF Redistribution w/ Sham-Link

I would be careful.
I've just seen a test case where the sham link will not come up
without distributing BGP into OSPF. If you still have your lab setup,
do a full reload and check if it comes back up.
(sham link endpoints where /32 loopbacks, advertized by BGP inside vrf)

Even though sham links behave like a "standard" point to point
unnumbered link inside the area x, there is nothing "standard" in them,
and plenty of MPLS magic, partially controlled by vrf-lite capability.

-Carlos

Yuri Bank @ 11/10/2011 15:53 -0300 dixit:
> Yeah it works fine without redistributing BGP into OSPF.
>
> My theory is that because the Sham-Link is up, LSAs are flooded and reach
> the CE without any problems.
>
> However, all of the labs, documentation etc show otherwise (redistribution
> of BGP into OSPF), which simply isn't necessary in my opinion. I'm just
> curious if anyone else has noticed this? Of course, if you aren't using a
> sham-link, redistribution of BGP into OSPF is necessary.
>
> -Yuri
>
> On Tue, Oct 11, 2011 at 11:23 AM, Marko Milivojevic <markom_at_ipexpert.com>wrote:
>
>> What happened when you labbed it up? Did it work? :-)
>>
>> --
>> Marko Milivojevic - CCIE #18427
>> Senior Technical Instructor - IPexpert
>>
>> FREE CCIE training: http://bit.ly/vLecture
>>
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>>
>> On Tue, Oct 11, 2011 at 11:09, Yuri Bank <yuribank_at_gmail.com> wrote:
>>> I'm curious if this is really necessary? I've done this in my lab and it
>>> seems to work fine. I understand that you MUST redistribute OSPF into BGP
>> on
>>> your PE, so that appropriate VPN labels are advertised to the remote PE.
>>> However, I see no reason to redistribute BGP into OSPF, since the LSAs
>> are
>>> getting advertised through the sham-link, and the CE routers will have a
>>> complete LinkState Database from that.
>>>
>>> Is there anything that I'm missing?
>>>
>>> -Yuri
>>>
>>>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net