+1 on what Gert said. You'll get log entries at the 90% threshold within
a region, but the badness only happens when you tickle the 100% threshold.
On 5/31/2016 11:45 AM, Gert Doering wrote:
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)
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