10gbps peering subscriber switch recommendation

Wed Jan 8 20:15:37 UTC 2014

On Wednesday, January 08, 2014 09:45:50 PM excelsio at gmx.com 
wrote:

> That´s 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´t
> 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 
Layer 2 and Layer 3 traffic in hardware, and this relies on 
forwarding entries being recorded into the FIB.

The 16,000 IPv4 entries or 8,000 IPv6 entries is because of 
limited FIB memory.

It's, typically, a switch limitation.

Mark.
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