Re: understanding redistribution

Ok you are you saying eigrp>ospf>bgp

bgp will would need eigrp explicitly redistributing for it to learn the eigrp prefixes only on the same router right?

How about no tags x to y then y back to x using different routers, like so.....this can cause double redistribution right?

When I do tag I don't seem to get any hits i.e tag 20 from ospf>eigrp then deny that tag inbound under the ospf process

       Eigrp
R1------------r2
| |
R3------------r4
   Ospf/eigrp

--
BR
Tony
Sent from my iPad
On 9 May 2013, at 21:38, Brian Dennis <bdennis_at_ine.com> wrote:
> You can tag all you want ;-)  You can't get a route from protocol X to Y
> and then to Z from Y on the same router.
> 
> -- 
> Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
> bdennis_at_ine.com
> 
> INE, Inc.
> http://www.INE.com
> 
> 
> 
> 
> On 5/9/13 1:00 PM, "Tony Singh" <mothafungla_at_gmail.com> wrote:
> 
>> Hey where's your tagging & community lists to prevent double
>> redistribution ;)
>> 
>> Brian one thing when we enable tagging to prevent the original routes
>> being re-learnt back in I never seem to get any hits on the route-maps in
>> bytes....anyone seen this?
>> 
>> Real gear btw
>> 
>> --
>> BR
>> 
>> Tony
>> 
>> Sent from my iPad
>> 
>> On 9 May 2013, at 19:47, Brian Dennis <bdennis_at_ine.com> wrote:
>> 
>>> If you redistribute protocol X into protocol Y, protocol X's routes
>>> can't
>>> go into protocol Z from protocol Y.  You need to also redistribute
>>> protocol X directly into protocol Z to get protocol X's routes into
>>> protocol Z.  This may not be easy to follow but it's important to
>>> understand.
>>> 
>>> The reason behind this is that redistribution is done from the RIB
>>> (routing table) and not done directly between routing protocols.  If you
>>> redistribute protocol X into protocol Y then Y will get protocol X's
>>> dynamic routes that are in the RIB (show ip route X) and for IPv4, by
>>> default, the connected interfaces that protocol X is enabled on (i.e.
>>> network statement, ip ospf 1 area 0, etc)
>>> 
>>> So in your case if you didn't redistribute say static into BGP but are
>>> redistributing static into EIGRP, BGP will not get the static routes
>>> that
>>> are redistributed into EIGRP when EIGRP is redistributed into BGP.
>>> 
>>> -- 
>>> Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
>>> bdennis_at_ine.com
>>> 
>>> INE, Inc.
>>> http://www.INE.com
>>> 
>>> 
>>> 
>>> 
>>> On 5/9/13 11:14 AM, "Cisco Fanatic" <ebay_products_at_hotmail.com> wrote:
>>> 
>>>> I am not sure if I understand this. If we are mutually redistributing
>>>> between
>>>> say EIGRP and BGP does it matter which protocol we redistribute
>>>> connected
>>>> and
>>>> static routes in?
>>>> 
>>>> router eigrp 1000
>>>> redistribute connected
>>>> redistribute bgp 65001 metric 15000 5 255 1 4470 router bgp 65001
>>>> redistribute static
>>>> redistribute eigrp 1000
>>>> ******** OR **************
>>> 
>>>> router eigrp 1000
>>>> redistribute static
>>>> redistribute bgp 65001 metric 15000 5 255 1 4470 router bgp 65001
>>>> redistribute connected
>>>> redistribute eigrp 1000
>>>> -Yuri
>>>> 
>>>> 
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