[193433] in North American Network Operators' Group
Re: External BGP Controller for L3 Switch BGP routing
daemon@ATHENA.MIT.EDU (Phil Bedard)
Tue Jan 17 15:46:44 2017
X-Original-To: nanog@nanog.org
Date: Tue, 17 Jan 2017 11:31:10 -0500
From: Phil Bedard <bedard.phil@gmail.com>
To: joel jaeggli <joelja@bogus.com>, Yucong Sun <sunyucong@gmail.com>,
Tore Anderson <tore@fud.no>, Saku Ytti <saku@ytti.fi>
In-Reply-To: <4ff16eef-8756-2e28-99c2-542e02079cb7@bogus.com>
Cc: nanog list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
Cisco and Arista are both able to squeeze a current full Internet table int=
o the base space on their Jericho boxes, using the right space partitioning.=
Cisco added this in 6.1.2 without anything in the release notes, but you=
=E2=80=99ll notice they bumped the datasheet spec on the base 5502 to 1M FIB now w=
here it used to be 256K. It works with the standard Internet table, but m=
ay not work if you have a ton of routes with lengths that do not work well w=
ith how the memory is carved up. Of course Jericho is more expensive than =
Trident. =20
Phil=20
-----Original Message-----
From: NANOG <nanog-bounces@nanog.org> on behalf of joel jaeggli <joelja@bog=
us.com>
Date: Tuesday, January 17, 2017 at 00:22
To: Yucong Sun <sunyucong@gmail.com>, Tore Anderson <tore@fud.no>, Saku Ytt=
i <saku@ytti.fi>
Cc: nanog list <nanog@nanog.org>
Subject: Re: External BGP Controller for L3 Switch BGP routing
On 1/15/17 11:00 PM, Yucong Sun wrote:
> In my setup, I use an BIRD instance to combine multiple internet full
> tables, i use some filter to generate some override route to send to=
my L3
> switch to do routing. The L3 switch is configured with the default r=
oute
> to the main transit provider , if BIRD is down, the route would be
> unoptimized, but everything else remain operable until i fixed that B=
IRD
> instance.
>=20
> I've asked around about why there isn't a L3 switch capable of handli=
ng
> full tables, I really don't understand the difference/logic behind it=
.
=20
In practice there are several merchant silicon implmentations that
support the addition of external tcams. building them accordingly
increases the COGS and and various performance and packaging limitions.
=20
arista 7280r and cisco ncs5500 are broadcom jericho based devices that
are packaged accordingly.
=20
