[168092] in North American Network Operators' Group
Re: 10gbps peering subscriber switch recommendation
daemon@ATHENA.MIT.EDU (Mark Tinka)
Wed Jan 8 15:16:07 2014
From: Mark Tinka <mark.tinka@seacom.mu>
To: nanog@nanog.org
Date: Wed, 8 Jan 2014 22:15:37 +0200
In-Reply-To: <52CDAAEE.4060305@gmx.com>
Reply-To: mark.tinka@seacom.mu
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Wednesday, January 08, 2014 09:45:50 PM excelsio@gmx.com=20
wrote:
> That=B4s actually a topic, I was thinking ago some time
> ago. Why not take a current TOR switch with 1. BGP
> support and 2. high buffer. Like mentioned above we have
> Trident 2 bases switches. HP (no recommendation) has its
> HP 5930 series but tells "Routing table size 16000
> entries (IPv4), 8000 entries (IPv6)", but this one has
> 4GB RAM, so plenty of space for full tables. I haven=B4t
> tried it out myself, perhaps someone tried on any other
> device: What will happen, if I give the switch a full
> table? Is there a software limit by the vendor, which
> will simply cut everything above? Or would it simply
> work?
The 4GB RAM is control plane memory.
The problem is FIB memory, since switches generally forward=20
Layer 2 and Layer 3 traffic in hardware, and this relies on=20
forwarding entries being recorded into the FIB.
The 16,000 IPv4 entries or 8,000 IPv6 entries is because of=20
limited FIB memory.
It's, typically, a switch limitation.
Mark.
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