Cisco and Arista are both able to squeeze a current full Internet table into
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’ll
notice they bumped the datasheet spec on the base 5502 to 1M FIB now where it
used to be 256K. It works with the standard Internet table, but may not work
if you have a ton of routes with lengths that do not work well with how the
memory is carved up. Of course Jericho is more expensive than Trident.
Phil
-----Original Message-----
From: NANOG <nanog-boun...@nanog.org> on behalf of joel jaeggli
<joe...@bogus.com>
Date: Tuesday, January 17, 2017 at 00:22
To: Yucong Sun <sunyuc...@gmail.com>, Tore Anderson <t...@fud.no>, Saku Ytti
<s...@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 route
> to the main transit provider , if BIRD is down, the route would be
> unoptimized, but everything else remain operable until i fixed that BIRD
> instance.
>
> I've asked around about why there isn't a L3 switch capable of handling
> full tables, I really don't understand the difference/logic behind it.
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.
arista 7280r and cisco ncs5500 are broadcom jericho based devices that
are packaged accordingly.
