[cisco-bba] 7200 - LNS -> cpu question

[Tassos Chatzithomaoglou]

Corbett Nelson (cornelso) wrote:

>>We have 80/30 mbps for atm and 30/80 mbps for eth. Do we need to count
> 
> all the virtual
> 
>>access interfaces' traffic too?
> 
> 
> So that is 110 Mbps total BiDirection traffic.
> 
> 
>>Ospf is set to passive for VT.
>>LAC is a Juniper ERX1400.
> 
> 
> Does the ERX set udp checksums? If so, you will want to ignore them on
> the Cisco.
> The command to do this is vpdn ip udp ignore checksum.
> 

I had tested this command a while ago, but i didn't see any difference so i suppose that 
ERX doesn't set udp checksums. Anyway, it's still enabled with no obvious difference.

> 
>>Input data
>>----------
>>2000 L2TP sessions terminated
>>netflow running on all input/output interfaces
>>ospf running
>>MQC (policy-map) per-user
>>no fragmentation problem
>>compression disabled
>>cef enabled
>>multicast (sparse) enabled on 5% of sessions
>>80 mbps input/30 mbps output traffic per interface (x2 for total)
> 
> 
> I have never run Netflow on all interfaces in this scenario so I don't
> know what the impact on your CPU load would be. Do you know what the
> distribution of packet size you have coming across the interfaces? What
> version of IOS are you running?
> 
> 
> 

-- 
***************************************
       Chatzithomaoglou Anastasios
Network Design & Development Department
              FORTHnet S.A.
          <achatz at forthnet.gr>
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