[194157] in North American Network Operators' Group
Re: BGP Route Reflector - Route Server, Router, etc
daemon@ATHENA.MIT.EDU (Mark Tinka)
Mon Mar 20 06:35:31 2017
X-Original-To: nanog@nanog.org
To: Justin Krejci <JKrejci@usinternet.com>, nanog@nanog.org
From: Mark Tinka <mark.tinka@seacom.mu>
Date: Mon, 20 Mar 2017 12:35:24 +0200
In-Reply-To: <20170113223934.GA18835@radiological.warningg.com>
Errors-To: nanog-bounces@nanog.org
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From: Mark Tinka <mark.tinka@seacom.mu>
To: Justin Krejci <JKrejci@usinternet.com>, nanog@nanog.org
Message-ID: <1f6a450c-fb19-d467-07ca-777c84d25542@seacom.mu>
Subject: Re: BGP Route Reflector - Route Server, Router, etc
References: <3E9C67DA261AC349B60FF3609F5E211D7D80357D@USI-2K10EX02-MT.usicorp.usinternet.com>
<20170113223934.GA18835@radiological.warningg.com>
In-Reply-To: <20170113223934.GA18835@radiological.warningg.com>
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On 14/Jan/17 00:39, Brandon Ewing wrote:
> One important thing to remember when migrating from full mesh to a RR d=
esign
> is that you are reducing information available to the routers in the AS=
N.
> When you had a full mesh, each router could select the best path from a=
ll
> available paths, according to its position in the IGP. In a RR environ=
ment,
> by default, routers only have available to them the best routes from th=
e
> RR's position in the IGP, which can lead to suboptimal exits being sele=
cted.
>
> Work is being done to allow RRs to compute metrics from the client's
> position in the IGP: See
> https://tools.ietf.org/html/draft-ietf-idr-bgp-optimal-route-reflection=
-13
> for more information
BGP-ORR is currently supported in Junos and IOS XR (ASR9000, I
believe... I haven't confirmed for other IOS XR platforms).
I'm getting Cisco to add support for it in IOS and IOS XE (CSR1000v).
I'm now dealing with the usual "How large is the customer's spend for
this feature" nonsense. BGP-ORR, I feel, is one of those features that
doesn't need a business case - much like ketchup at a fast-food joint.
That the IOS XR PI team have it in there and the IOS/IOS XE PI teams
don't highlights the depth of the fundamental problem over at Cisco-land.=
Mark.
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