thats without prepends in the previous…

Terri Kelley
Network Engineer
254-697-6710
Farm to Market Broadband



On Aug 25, 2014, at 10:17 PM, Terri Kelley wrote:

> maybe the other way around since it is prepended to ATT? It would come in on 
> TW first since it looks like it is further away on ATT? The rest of the /20 
> would come in as it does now with any prepends?
> 
> Terri Kelley
> Network Engineer
> 254-697-6710
> Farm to Market Broadband
> 
> 
> 
> On Aug 25, 2014, at 10:11 PM, Mike Hammett wrote:
> 
>> I'll quickly yield to someone else, but I believe the smallest network block 
>> always wins, regardless of any other pushing. I think the /22 would go AT&T 
>> instead of TW because of this. 
>> 
>> 
>> 
>> 
>> ----- 
>> Mike Hammett 
>> Intelligent Computing Solutions 
>> http://www.ics-il.com 
>> 
>> 
>> 
>> ----- Original Message -----
>> 
>> From: "Terri Kelley" <[email protected]> 
>> To: "Mikrotik discussions" <[email protected]> 
>> Sent: Monday, August 25, 2014 10:07:07 PM 
>> Subject: [Mikrotik] prepend in BGP 
>> 
>> I think I asked this before but can't find it so here it is. I coming up on 
>> the need to load balance between my upstreams from my bgp edge. Question is, 
>> do I have to list each subnet prepending the ones I want or can I list the 
>> whole subnet then follow that with the prepend on the part that I want. 
>> Example is (changing the real IP blocks for the example) with TW being one 
>> of my upstreams and ATT the other all to the same edge router… 
>> 
>> /routing filter 
>> add action=accept chain=TW-out prefix=192.168.48.0/20 
>> add action=discard chain=TW-out 
>> add action=accept chain=ATT-out prefix=192.168.48.0/20 
>> add action=accept chain=ATT-out prefix=192.168.52.0/22 set-bgp-prepend=3 
>> add action=discard chain=ATT-out 
>> 
>> I'm hoping that will move the 192.168.52.0/22 over to the TW side unless it 
>> goes down and leave the rest of the 48.0/20 block on the ATT. Otherwise I 
>> need to list each one subnet out on the ATT entries I think. 
>> 
>> Terri Kelley 
>> Network Engineer 
>> 254-697-6710 
>> Farm to Market Broadband 
>> 
>> 
>> 
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