Layer 2 vs. Layer 3 to TOR

Olof Kasselstrand olof.kasselstrand at
Fri Nov 13 07:01:32 UTC 2009

I would suggest doing a VC with the TOR switches. That way you can
have "one" switch for a lot of racks (I believe 10 would be the upper
limit if using Juniper). If you have a VC  you could do L3 and L2
where needed on every rack that the VC covers.

// Olof

2009/11/13 Łukasz Bromirski <lukasz at>:
> On 2009-11-12 22:37, David Coulson wrote:
>> The MX-series are pretty nice. That should be able to do VPLS PE,
>> however I've never tried it - MX240 did it pretty well last time I
>> tried. I've no clue how the cost of that switch compares to a cisco 4900
>> or something (not that a 4900 is anything special - L3 is all in
>> software).
> For both 4948/4948-10GE and 4900M L3 is in hardware. For
> 4948/4948-10GE IPv6 is in software, for 4900M it's in hardware.
> --
> "Everything will be okay in the end. |                  Łukasz Bromirski
>  If it's not okay, it's not the end. |

More information about the NANOG mailing list