06-02-2009 11:42 AM - edited 03-04-2019 04:58 AM
Well we do not use BGP communities here at work but I'm getting to know them for my BSCI exam.
1. Why are there separate well-known communities for no-export and local-AS? They both seem designed to do the same thing.
2. What's the use of non-well-known communities? It seems like they'd accomplish the same thing as route tagging.
Thanks.
Solved! Go to Solution.
06-02-2009 01:08 PM
Hi,
Local-AS will not advertise to other ASes within the confederation while No-Export will.
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Edison.
06-02-2009 12:21 PM
1. Not the same thing.
No-Export:
Routes with this community are advertised to only peers in the same autonomous system or to only other subautonomous systems within a confederation. These routes are not advertised to external peers.
Local-AS:
Routes with community are advertised to only peers that are part of the local autonomous system or to only peers within a subautonomous system of a confederation. These routes are not advertised external peers or to other subautonomous systems within a confederation.
2. Yes, it's tagging of routes.
HTH,
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Edison.
06-02-2009 01:01 PM
"No-Export:
Routes with this community are advertised to only peers in the same autonomous system or to only other subautonomous systems within a confederation. These routes are not advertised to external peers.
Local-AS:
Routes with community are advertised to only peers that are part of the local autonomous system or to only peers within a subautonomous system of a confederation. These routes are not advertised external peers or to other subautonomous systems within a confederation."
The difference then is....?
06-02-2009 01:08 PM
Hi,
Local-AS will not advertise to other ASes within the confederation while No-Export will.
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Edison.
06-02-2009 01:09 PM
You mean other confederations within the AS?
06-02-2009 01:15 PM
A confederation is a group of sub-ASes, so the correct term is 'ASes within a confederation'.
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Edison.
06-02-2009 01:27 PM
Hmmm, and here I thought a confederation WAS a sub-AS.
BGP is not for tiny networks.
Thanks for the xplanation.
06-02-2009 02:29 PM
Perhaps this read can help you understand the concept better:
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Edison.
06-02-2009 10:50 PM
Hello Edison,
Your above Post and Link extremely useful.
~Mirza.
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