Re: BGP Route Reflector with Synchronization ON

You can ignore RIB-failure as long as you have same route in Default
routing table learned from OSPF or static/connected, or other IGP.

It is informational flag appeared from 12.2T.

http://blog.ioshints.info/2007/12/what-is-bgp-rib-failure.html
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml#twenty-three

Alex

Divin Mathew John wrote:
> I get that.! But.. with Route Reflectors the 5.5.0.0/24, 6.6.0.0/34
> 7.7.0.0/24 are all there in the OSPF Domain too.. Those routes arent
> getting a R.I.B failure.! i need to know why?... When i see the
> roptuing table... OSPF has a route to the Destination but... BGP isnt
> showing it as a RIB failure when SYN is ON.! I switch OFF SYN on R6
> and its BGP table is fine... as expected.! 5.0.0.0/16 6.0.0.0/16
> 7.0.0.0/16 all have RIB Failure due to the OSPF Routes!
> Thanking You
>
> Yours Sincerely
>
> Divin Mathew John
> divinjohn_at_gmail.com
> divin_at_dide3d.com
> http://www.dide3d.com
> +91 9945430983
> +91 9846697191
> +974 5008916
> PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
> Sent from Bangalore, KA, India
>
>
> 2009/5/13 Alex H. Ryu <r.hyunseog_at_ieee.org>:
>
>> If you have BGP routes not in IGP such as OSPF, you should turn OFF BGP
>> synchronization.
>> For an example, if you peer with EBGP and/or your router is working as
>> transit router from BGP viewpoint, you have to turn off.
>>
>> BGP sync will check IGP routing table, and if it is not in there, BGP
>> will not install those BGP prefix for active entry.
>>
>>
>> Alex
>>
>>
>> Divin Mathew John wrote:
>>
>>> Hey...
>>> i have this scenario where R5-----R6-----R7 and R7 is connected to
>>> R5 for redundancy.! now. I made R5 the Route Reflector. and i have
>>> OSPF running with all the loopbacks advertised in OSPF. Now without
>>> turning ON Synchronization this is the output
>>> R6#sh ip bgp
>>> r>i5.5.0.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.1.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.2.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.3.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.4.0/24 5.5.0.5 0 100 0 ?
>>> r>i7.7.0.0/24 7.7.0.7 0 100 0 ?
>>> r>i7.7.1.0/24 7.7.0.7 0 100 0 ?
>>> r>i7.7.2.0/24 7.7.0.7 0 100 0 ?
>>> r>i7.7.3.0/24 7.7.0.7 0 100 0 ?
>>> r>i7.7.4.0/24 7.7.0.7 0 100 0 ?
>>>
>>> where as in Switch ON Synchronization @R6
>>>
>>> r>i5.5.0.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.1.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.2.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.3.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.4.0/24 5.5.0.5 0 100 0 ?
>>> *> 6.6.0.0/24 0.0.0.0 0 32768 ?
>>> *> 6.6.1.0/24 0.0.0.0 0 32768 ?
>>> *> 6.6.2.0/24 0.0.0.0 0 32768 ?
>>> *> 6.6.3.0/24 0.0.0.0 0 32768 ?
>>> *> 6.6.4.0/24 0.0.0.0 0 32768 ?
>>> * i7.7.0.0/24 7.7.0.7 0 100 0 ?
>>> * i7.7.1.0/24 7.7.0.7 0 100 0 ?
>>> * i7.7.2.0/24 7.7.0.7 0 100 0 ?
>>> * i7.7.3.0/24 7.7.0.7 0 100 0 ?
>>> * i7.7.4.0/24 7.7.0.7 0 100 0 ?
>>>
>>> @R7 SYN is OFF
>>> r>i5.5.0.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.1.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.2.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.3.0/24 5.5.0.5 0 100 0 ?
>>> r>i5.5.4.0/24 5.5.0.5 0 100 0 ?
>>> r>i6.6.0.0/24 6.6.0.6 0 100 0 ?
>>> r>i6.6.1.0/24 6.6.0.6 0 100 0 ?
>>> r>i6.6.2.0/24 6.6.0.6 0 100 0 ?
>>> r>i6.6.3.0/24 6.6.0.6 0 100 0 ?
>>> r>i6.6.4.0/24 6.6.0.6 0 100 0 ?
>>> *> 7.7.0.0/24 0.0.0.0 0 32768 ?
>>> *> 7.7.1.0/24 0.0.0.0 0 32768 ?
>>> *> 7.7.2.0/24 0.0.0.0 0 32768 ?
>>> *> 7.7.3.0/24 0.0.0.0 0 32768 ?
>>>
>>> I turn OFF SYN at R6 and everything has a RIB failure.. becoz OSPF is
>>> running advertising all the loopbacks.!
>>>
>>> Is there any special thing to be noted while using SYNC with Route Reflectors.!
>>>
>>> Generally SYNC is OFF.. Just out of curiosity.!
>>>
>>>
>>> Thanking You
>>>
>>> Yours Sincerely
>>>
>>> Divin Mathew John
>>> divinjohn_at_gmail.com
>>> divin_at_dide3d.com
>>> http://www.dide3d.com
>>> +91 9945430983
>>> +91 9846697191
>>> +974 5008916
>>> PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
>>> Sent from Bangalore, KA, India
>>>
>>>
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Received on Wed May 13 2009 - 13:13:12 ART