[c-nsp] RSP720-3C-10GE with daughter card = RSP720-3CXL-10GE?

[Frédéric LOUI]

Le 24 juin 2010 à 16:19, Phil Mayers a écrit :

> On 24/06/10 14:53, Frédéric LOUI wrote:
>> In our lab setup, we have 2 full internet feeds (IPv4 / IPv6) thus ~
>> 670000 + v6 prefixes Netflow v9 is working without any issue so far
>> (without sampling). However we did not test netflow v9 with MPLS
>> features.
> 
> Sampling on the PFC/DFC platforms probably doesn't do what you want it
> to do. It still captures all flows; just only exports a subset. This
> saves neither TCAM nor significant CPU at the export side.
> 
>> According to my technical representative, on 8x10GE card with 3CXL,
>> NDE is handled by the linecard itself (i.e de-centralized NDE instead
>> of centralized NDE from the main RSP board) Not sure about " 4x10GE
>> card upgraded with 3CXL" though
> 
> Under most conditions, DFC-equipped linecards export the netflow themselves.
> 
> There are some conditions where the netflow PDUs have to be post-processed by the RP. Amongst others, if you want source/dest AS numbers in the flows, these are added in software by the RP, eliminating the benefits of distributed NDE.

Thanks very much for the precisions. 

> 
>> 
>> I'd be happy to have some REAL figures regarding MPLS aware netflow
>> with 760x/3CXL :-)
> 
> Figures about what?
Sorry, what I meant by *figures*: 
 - How much (additional?) netflow traffic (bandwidth) can be transferred by NDE
 - How many (additional?) flows the BOX can handle ?
 - What is the impact in term of resource and linecard CPU when activating MPLS aware netflow ?

Has someone experienced  performance degradation on a 3CXL 760X when activating MPLS aware netflow ?

Thnks in advance for your feedback :-)

-- 
Frederic 

> 
> Also, be aware that DFC/PFC platforms (until recently) only generate flows for packets which ingress as plain IPv4. MPLS LSPs don't generate netflow, either in label-swap or label pop.
> 
> This may mean you only see flows at the ingress PE.
> 
> There is a feature in some releases (e.g. SXI4 for 6500/sup720, which is basically the same underlying hardware) which claims to do "egress mpls netflow", where flows are generated for final label-pop i.e. on egress PEs too. It didn't seem to work when I tried it.
> 
> This may all be very different if 7600 WAN cards are in the mix.
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