RE: [nsp] MSFC2 and QOS

From: Greene, Patrick (pjgreene@infotechent.net)
Date: Tue Mar 05 2002 - 18:22:22 EST


Kat,
You should really consider shaping as opposed to policing. You can do CAR without the PFC, just like you would a router, however this is slower and much more processor intensive. You can police with hardware but need a PFC. Shaping will provider a much more elegant approach to limiting the amount of bandwidth for whatever you need to limit (VLAN, protocol, etc). If you police traffic you end up forcing TCP/IP to re-transmit, however if you shape, traffic is queued and you will not get the re-transmits. Your traffic curve smoothes out and reduce your re-transmits. Shaping requires a PFC.
 
Thanks,
Patrick Greene

        -----Original Message-----
        From: Kathleen Ronay [mailto:kronay@saffron.org]
        Sent: Mon 3/4/2002 3:38 PM
        To: cisco-nsp@puck.nether.net
        Cc:
        Subject: [nsp] MSFC2 and QOS
        
        


        Does anyone know for sure that a 6509 with an MSFC2 module can do QOS,
        rate-limiting? Do you need a PFC?
        
        Any urls would also be greatly appreciated.
        
        Kat
        Invisiblehand Neworks
        
        
        



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