Re: BGP Community Support WAS: Re: Cogent vs. HE ;-) WAS: Anyone using Cogent Ethernet

[Mike Hammett <nanog () ics-il net>]

Knowing the relationship between my provider and whomever they are learning the route from is handy. It allows me to do 
things such as filter on those communities for passing prefixes down into less capable hardware. I may elect to pass 
customer or customer and peering routes from a given provider down into routers throughout my network with limited FIB 
capability. They can decide which way to send traffic that should be immediately apparent where the best path is, while 
leaving the provider edge routers to decide for prefixes beyond that. Say a CCR or a switch with some layer 3 
capabilities. 


Then obviously things like blackhole and (local_pref, prepend, no export, etc. per AS). 


The above I'd say is rather important. The next step would be location-aware stuff in the presentation that would be 
nice to have. If your provider is having an issue with an upstream or peer in a given city\region, being able to avoid 
that would be nice. Of course that assumes you figure out their problem and the work-around before they're able to fix 
it themselves. Well, assuming it's a short-term issue, anyway. If it's a constant issue, your provider isn't likely to 
fix it faster than you because they're not fixing it at all. 




----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

Midwest-IX 
http://www.midwest-ix.com 

----- Original Message -----

From: "James Breeden" <James () arenalgroup co> 
To: "NANOG list" <nanog () nanog org> 
Sent: Tuesday, January 23, 2018 1:17:45 PM 
Subject: Re: BGP Community Support WAS: Re: Cogent vs. HE ;-) WAS: Anyone using Cogent Ethernet 

I've seen the onestep list but the presentation is helpful. I guess my question was moreso to the people side of 
communities vs the technicalities of communities - what ones do people find themselves using most often and what do 
they wish was available from providers that really isn't otherwise out there? 



James W. Breeden 

Managing Partner 



[logo_transparent_background] 

Arenal Group: Arenal Consulting Group | Acilis Telecom | Pines Media 

PO Box 1063 | Smithville, TX 78957 

Email: james () arenalgroup co<mailto:james () arenalgroup co> | office 512.360.0000 | cell 512.304.0745 | 
www.arenalgroup.co<http://www.arenalgroup.co/> 

________________________________ 
From: christopher.morrow () gmail com <christopher.morrow () gmail com> on behalf of Christopher Morrow <morrowc.lists 
() gmail com> 
Sent: Tuesday, January 23, 2018 1:07:29 PM 
To: Mike Hammett 
Cc: James Breeden; NANOG list 
Subject: Re: BGP Community Support WAS: Re: Cogent vs. HE ;-) WAS: Anyone using Cogent Ethernet 



On Tue, Jan 23, 2018 at 1:40 PM, Mike Hammett <nanog () ics-il net<mailto:nanog () ics-il net>> wrote: 
These? :-) 

https://www.nanog.org/meetings/nanog40/presentations/BGPcommunities.pdf 


you could also probably get some good examples cribbed from the collection: 
https://onestep.net/communities/