nanog mailing list archives
Re: Muni fiber: L1 or L2?
From: Jean-Francois Mezei <jfmezei_nanog () vaxination ca>
Date: Wed, 06 Feb 2013 17:04:04 -0500
On 13-02-06 16:53, Scott Helms wrote:
You realize that most commonly the L2TP LAC and LNS are just routers right? You're not getting rid of boxes, you're just getting rid of the only open access technology that's had significant success in the US or Europe.
Actually, there is a cost. In lower end Juniper routers, when you combine both L2TP and PPPoE, the total performance of the LNS router drops significantly because the interface cards can't do both at same time so the traffic must travel the backpane to the CPU/auxiliary processor for the second step. (at the LAC level, there is less overhead because PPPoE packets are just passed to the L2TP side, but at LNS, PPPoE packets have to be processed). Apparently, Juniper has worked to reduce this performance penalty in newer routers. But routers such as the ERX310 suffered from this quite a bit. (throughput of about 1.5mbps from what I have been told).
Current thread:
- Re: Muni fiber: L1 or L2?, (continued)
- Re: Muni fiber: L1 or L2? Scott Helms (Feb 04)
- Re: Muni fiber: L1 or L2? Jean-Francois Mezei (Feb 04)
- Re: Muni fiber: L1 or L2? Masataka Ohta (Feb 05)
- RE: Muni fiber: L1 or L2? Eric Wieling (Feb 05)
- Re: Muni fiber: L1 or L2? Masataka Ohta (Feb 05)
- RE: Muni fiber: L1 or L2? Eric Wieling (Feb 05)
- Re: Muni fiber: L1 or L2? Masataka Ohta (Feb 05)
- Re: Muni fiber: L1 or L2? Scott Helms (Feb 06)
- Re: Muni fiber: L1 or L2? Masataka Ohta (Feb 06)
- Re: Muni fiber: L1 or L2? Scott Helms (Feb 06)
- Re: Muni fiber: L1 or L2? Jean-Francois Mezei (Feb 06)
- Re: Muni fiber: L1 or L2? Scott Helms (Feb 06)
- Re: Muni fiber: L1 or L2? Jean-Francois Mezei (Feb 06)
- Re: Muni fiber: L1 or L2? Scott Helms (Feb 06)
- Re: Muni fiber: L1 or L2? Jean-Francois Mezei (Feb 06)
- Re: Muni fiber: L1 or L2? Alain Hebert (Feb 08)
- Re: Muni fiber: L1 or L2? Masataka Ohta (Feb 06)
- Re: Muni fiber: L1 or L2? Scott Helms (Feb 06)
- Re: Muni fiber: L1 or L2? Masataka Ohta (Feb 06)
- Re: Muni fiber: L1 or L2? Mikael Abrahamsson (Feb 07)
- Re: Muni fiber: L1 or L2? Scott Helms (Feb 07)