Duleep,
Assuming AS-PATH is equal and AS-Content different how can you
know that the internal metrics of each AS are consistent and mirror actual
geographic distances? You have to be assured that each administrative domain
applies the same metric assignment. I do not believe this is possible when
there are multiple administrative domains.
Jim Uttaro
From: BESS [mailto:bess-boun...@ietf.org] On Behalf Of Duleep Thilakarathne
Sent: Friday, August 07, 2015 5:19 AM
To: Robert Raszuk
Cc: bess@ietf.org
Subject: Re: [bess] BGP route selection criteria - geographic distance when
AS_PATH are equal
Hi Raszuk,
I went through RFC7311 and my concern is different than RFC 7311. I have
analyzed full BGP routing table (541,199 routes) with two tier 1 ISP
multi-homing scenario and found nearly 50% of routes have equal AS-PATH length.
In this analysis It was considered, there was no route policy applied to
influence local preference. According to BGP best path selection algorithm,
when AS-PATH lengths are equal, router breaks tie condition based on route
internal logic. This does not grantee proper outgoing path selection.
Appreciate your concern on above analysis.
Regards
Duleept
From: Robert Raszuk [mailto:rob...@raszuk.net]
Sent: Monday, July 27, 2015 2:40 AM
To: Duleep Thilakarathne
Cc: bess@ietf.org<mailto:bess@ietf.org>
Subject: Re: [bess] BGP route selection criteria - geographic distance when
AS_PATH are equal
Hi Duleep,
Please consider RFC 7311 and provide feedback why you think it is not
sufficient for your objective.
https://tools.ietf.org/html/rfc7311
Best,
R.
On Sun, Jul 26, 2015 at 9:15 PM, Duleep Thilakarathne
<dule...@mobitel.lk<mailto:dule...@mobitel.lk>> wrote:
Hi,
I would like to suggest to consider geographic distance when AS_PATH are equal
in BGP route selection criteria. (as tie breaking rule). Can anybody comment on
my idea.
Regards
Duleept
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