nanog mailing list archives
Re: Layer 2 vs. Layer 3 to TOR
From: David Coulson <david () davidcoulson net>
Date: Thu, 12 Nov 2009 16:37:24 -0500
Jonathan Lassoff 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).I was recently looking into this (top-of-rack VPLS PE box). Doesn't seem to be any obvious options, though the new Juniper MX80 sounds like it can do this. It's 2 RU, and looks like it can take a DPC card or comes in a fixed 48-port GigE variety.
The biggest hurdle we hit when trying to do TOR L3 (Cisco 4948s w/ /24s routed to each one) was devices that either required multiple physical Ethernet connections that we typically use LACP with, or any environments that do IP takeover for redundancy. Both are obviously easily worked around if you run an IGP on your servers, but that was just insanely complex for our environment. It's hard to convince people that a HP-UX box needs to work like a router now.Are there any applications that absolutely *have* to sit on the same LAN/broadcast domain and can't be configured to use unicast or multicast IP?
So now we have a datacenter full of 4948s doing pure L2 and spanning tree... What a waste :-)
Current thread:
- Re: Layer 2 vs. Layer 3 to TOR, (continued)
- Re: Layer 2 vs. Layer 3 to TOR Seth Mattinen (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Brandon Ewing (Nov 12)
- RE: Layer 2 vs. Layer 3 to TOR Bulger, Tim (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Brandon Galbraith (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Nick Hilliard (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Kinkie (Nov 18)
- Re: Layer 2 vs. Layer 3 to TOR Eugeniu Patrascu (Nov 18)
- Re: Layer 2 vs. Layer 3 to TOR Chuck Anderson (Nov 18)
- Re: Layer 2 vs. Layer 3 to TOR Seth Mattinen (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR David Coulson (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Jonathan Lassoff (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR David Coulson (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Ćukasz Bromirski (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Olof Kasselstrand (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Malte von dem Hagen (Nov 12)
- Re: Layer 2 vs. Layer 3 to TOR Tore Anderson (Nov 13)
- Re: Layer 2 vs. Layer 3 to TOR gordon b slater (Nov 15)
- Re: Layer 2 vs. Layer 3 to TOR Simon Leinen (Nov 15)
- Re: Layer 2 vs. Layer 3 to TOR Matthew Walster (Nov 13)
- Re: Layer 2 vs. Layer 3 to TOR Randy Bush (Nov 13)
- Re: Layer 2 vs. Layer 3 to TOR Stefan (Nov 13)
- Re: Layer 2 vs. Layer 3 to TOR rodrick brown (Nov 13)