They should be software switched. If you're moving much traffic through
the box, that's not good. You might want to filter the BGP feeds so
you're carrying less than the max supported number of routes...though even
if you filtered on RIR minimums, I'm not sure you'd still be able to fit
the resulting number of routes into your 196k limit. I know you could
several years ago (i.e. 2007), but the global table was >100k routes
smaller then.
On Thu, 5 May 2011, Bill Blackford wrote:
Platform: 7600/SUP720-B
If a box that can only handle sub 200k IPV4 routes in TCAM receives
two full feeds and as shown below is only 'using' 196305 of them, is
the delta of that 350k dropped or is it then processed in software?
Looking a 'sh route sum' it looks like a full table in the FIB. 'sh fm
sum' shows nothing INACTIVE.
<snip>
L3 Forwarding Resources
FIB TCAM usage: Total Used %Used
72 bits (IPv4, MPLS, EoM) 196608 196305 100%
144 bits (IP mcast, IPv6) 32768 5 1%
detail: Protocol Used %Used
IPv4 196305 100%
MPLS 0 0%
EoM 0 0%
IPv6 2 1%
IPv4 mcast 3 1%
IPv6 mcast 0 0%
Adjacency usage: Total Used %Used
1048576 199 1%
</snip>
I see this in the logs which was my first clue for asking this question:
<snip>
%MLSCEF-SP-7-FIB_EXCEPTION: FIB TCAM exception, Some entries will be
software switched
</snip>
thank you in advance for any input.
-b
--
Bill Blackford
Network Engineer
Logged into reality and abusing my sudo privileges.....
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Senior Network Engineer | therefore you are
Atlantic Net |
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