nanog mailing list archives
Re: subnet prefix length > 64 breaks IPv6?
From: sthaug () nethelp no
Date: Sat, 07 Jan 2012 14:24:28 +0100 (CET)
"Note: An IPv4 route requires only one TCAM entry. Because of the hardware compression scheme used for IPv6, an IPv6 route can take more than one TCAM entry, reducing the number of entries forwarded in hardware. For example, for IPv6 directly connected IP addresses, the desktop template might allow less than two thousand entries." Translated: "The stated numbers for IPv6 routes are twice the real max. However, prefix compression may give better utilisation under certain conditions".
Thanks, that's the first *specific* information I've seen of equipment that might have problems (reduced number of entries) with longer than 64 bit prefixes. Fortunately we're not using 3560/3750 for IPv6 routing at the moment. Any other takers? Steinar Haug, Nethelp consulting, sthaug () nethelp no
Current thread:
- Re: subnet prefix length > 64 breaks IPv6? Owen DeLong (Jan 03)
- Re: subnet prefix length > 64 breaks IPv6? Alexandru Petrescu (Jan 04)
- <Possible follow-ups>
- Re: subnet prefix length > 64 breaks IPv6? Owen DeLong (Jan 03)
- Re: subnet prefix length > 64 breaks IPv6? Karl Auer (Jan 03)
- Re: subnet prefix length > 64 breaks IPv6? Joel jaeggli (Jan 04)
- Re: subnet prefix length > 64 breaks IPv6? Bjørn Mork (Jan 07)
- Re: subnet prefix length > 64 breaks IPv6? sthaug (Jan 07)