[c-nsp] eigrp on pe-ce with backdoor link

[BALLA Attila]

Hi,

   it's me again... ;-)
   I was notified that 12.0(28)S already supports NPE-G1, so my 
pre-bestpath selection problem is over. I tried it, and it's working 
properly.
   Is anybody using a npe-g1 with 12.0(28)S2 in service provider 
environment? Is any stability issue?

BR,
   Attila

On Wed, 2 Feb 2005, BALLA Attila wrote:

> So I read again the release-notes...
> It sais, that the 12.0(27)S introduces this pre-bestpath community, and it 
> carris the eigrp route type and metric.
> I had a misconfiguration, I set redistribute connected under bgp, after 
> eliminating this the connected routes have eigrp type and metric.
> But this _automatic_ pre-bestpath setting is under 12.0(27)S only, and 
> 12.2(S) knows this pre-bestpath, but it is not automatic...
> Am I right?
>
> Attila
>
> On Wed, 2 Feb 2005, BALLA Attila wrote:
>
>> Hi,
>> 
>>   I have a test network with three 7200 routers (PE1, PE2 and PE3), they
>> are connected to each other via FastEthernet. PExs form an MPLS core, and
>> PE2 is a route-reflector.
>>   CE1 and CE2 is connected to PE1 via serial link.
>>   CE3 is connected to PE2 via serial link.
>>   There is a backdoor Ethernet segment between the CExs, with high delay
>> and low bandwidth parameters, so the Serial link would be the preffered
>> uplink.
>>   There is a connected LAN segment and a Loopback at PE3.
>>   These are in the same VRF, and we use EIGRP on PE-CE.
>> 
>> 
>>   If I use 12.0(27)S4 on the PEx routers, then everything is working
>> properly. Only the convergence is slow (about 3 minutes)
>>   But we would like to use npe-g1 also, and 12.0S doesn't support it...
>> 
>>   And if we use 12.2(25)S2 for example on PE3, then we get a great routing
>> loop. PE2 sees the PE3's Loopback toward CE3 router, and CE3 sees it
>> toward CE2 and so on...
>> 
>>   I think the problem is around the bgp best-path selection, and cost
>> community.
>>   I read the config guide on cco about 12.0(27)S and it sais there are no
>> configuration required... (which is true with this release but 12.2(25)S)
>>   I don't use any special thing: I don't use SOO, because I don't want to
>> upgrade to CExs, and I do only redistribute eigrp routes into bgp (with
>> redistribute eigrp 1) and redistribute bgp routes into eigrp
>> address-family (with redistrubite bgp <as> 100000 100 255 1 1500)
>> 
>>   Does anybody have a similar scenario? How do you configure properly this
>> bgp cost community?
>> 
>> Best Regards:
>>   Attila
>> 
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>