> Most vendors have a TCAM that by default does IPv6 routing for netmasks <=64. > > They have a separate TCAM (which is usually limited in size) that does > routing for masks >64 and <=128.
Please provide references. I haven't seen any documentation of such an architecture myself. > TCAMs are expensive and increase the BOM cost of routers. Storing > routes with masks > 64 takes up twice the number of TCAM entries as > the routes with masks <= 64. Since IPv6 is *supposed* to work with /64 > masks, most vendors (usually the not-so-expensive-routers) provide a > smaller TCAM for > /64 masks. Ah, but do the "not-so-expensive-routers" use TCAM at all? Steinar Haug, Nethelp consulting, [email protected]
