Hi, On Tue, May 31, 2016 at 07:19:22PM +0100, James Bensley wrote: > I have asked TAC and they said the TCAM can be 100% used, not until we > have 1,024,000 entries in TCAM will we start of see the syslog > messages for failing to install a prefix. I am certain that one CAN > NOT use 100% of the TCAM space, I'm sure I read somewhere that at > around 90% utilisation we start so process switch / drop packets / > fail to install routes.
You can use 100% of what you have partitoned for - so if you partion for 512k IPv4, you'll blow up at 512*1024 IPv4 routes (minus a few, I'd assume). Been there, done that - not at 512k but at something like 200k on non-XLs, years ago. That "at 90% utilization bad things will happen" sounds like an urban legend from the BNC ethernet times... it's TCAM, there is nothing magic about 90% - either a route can be poked in there, then it will work, or not, then all excess routes will be process switch (and subject to rate-limiting) > I obviously can???t find any Cisco documentation on saying we can???t use > 100% of the TCAM. TAC have said we can use 100% of the TCAM. I still > don???t believe this, I???m so certain I have read somewhere that we > can???t. You can't use 100%, as you'll never get the partitioning right... gert -- USENET is *not* the non-clickable part of WWW! //www.muc.de/~gert/ Gert Doering - Munich, Germany g...@greenie.muc.de fax: +49-89-35655025 g...@net.informatik.tu-muenchen.de
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