[c-nsp] Sup32 TCAM limit

[Julio Arruda]

Phil Bedard wrote:
> Like you said, the limit is around 250k routes.  The box will through a 
> FIB EXCEPTION when it reaches that limit.  It will remove the 
> shortest-match prefixes from the TCAM and install a default route with a 
> PUNT adjacency, which punts traffic to the MSFC.  You don't really want 
> to software switch anything through the SUP32...

'If is not supported in hardware is not supported' :-), correct ?

> I don't know anyone that uses the SUP32 to carry a full Internet table.

A friend of mine last year found their 3B suffering from this 'disease' :-)
They went into their long process to buy the upgrades, and they took 
some time it seems, during that period, I mentioned to him the threads 
here, and ways to squeeze most of their 3Bs(they had the default config, 
I think reserving MPLS and etc tcam entries), but was really not 
something I would have recommended :-)

> On Jun 26, 2008, at 3:48 AM, Gregoire Huet wrote:
> 
>> Hello
>>
>> Reading the previous threads on this topic, I have understood that the 
>> TCAM
>> size would limit the number of routes on the Sup32 supervisor blade to 
>> 249k.
>>
>> What I do not understand is what would happen to the routes being 
>> inserted
>> above this limit. Would such routes be 'soft' routed ? Is there also a 
>> treshold for
>>
>> I would appreciate to know your experience with this blade and the 
>> increasing
>> number of public IPv4 routes.