nanog mailing list archives
Re: Using IPv6 with prefixes shorter than a /64 on a LAN
From: Mark Smith <nanog () 85d5b20a518b8f6864949bd940457dc124746ddc nosense org>
Date: Tue, 25 Jan 2011 19:59:34 +1030
On Tue, 25 Jan 2011 07:02:30 +0100 (CET) sthaug () nethelp no wrote:
IPv6 is classless; routers cannot blindly make that assumption for "performance optimization".Blindly, no. However, it's not impractical to implement fast path switching that handles things on /64s and push anything that requires something else to the slow path.Any vendor who was stupid enough to do *hardware* switching for up to /64 and punted the rest to software would certainly not get any sales from us.
Actually, they'd most likely punt the rest to exact match rather than longest match cams. Exact match cams are cheaper because they're simpler, and have been made even more so because they've been for more than a decade layer 2 switches, and they're are far many more of them than there are routers.
128 bits. No magic.
"magic" is another way of describing progress. Electric start cars would have been "magic" to owners of Motorwagens.
Current thread:
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN, (continued)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Matthew Petach (Jan 30)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Fernando Gont (Jan 30)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Matthew Petach (Jan 31)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mikael Abrahamsson (Jan 30)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Per Carlson (Jan 31)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mikael Abrahamsson (Jan 31)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Andrews (Jan 24)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Owen DeLong (Jan 24)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN sthaug (Jan 24)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Smith (Jan 25)