[c-nsp] Sup32 TCAM limit

[The Father]

Man, that's just swell.  We recently ran into this same issue after 
enabling MPLS on our SUP32s (core and gateways).  I always had a feeling 
that they were limited but didn't really realize it until we started 
seeing the EXCEPTION messages.  I'm hoping they can last another year or 
so and then replace them with either GSRs or ASR1000s.....the gateways 
that is....the core I would hope to have BGP-less and possibly free up 
some routes with additional OSPF enhancements.

So if these SUP32s are pretty much useless for holding the full internet 
tables, what good are they?  PEs sometimes have full Internet routes so 
where would they fit in?

Jose


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