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New Member

SPD aggressive mode

Has anyone out there looked at running Selective Packet Discard (SPD) aggressive mode on OSR routers? This is a new function to me and I would like to know if anyone has experience running this. It would seem to make sense to prevent smurf attacks. In my case it would be primarily on 2500 and 2600 seriers routers.

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New Member

Re: SPD aggressive mode

HI,

There are 2 parts in SPD :

- dropping packets based on the size of the input hold queue of the inbound interface. This is where the headroom comes into play to allow high priority packets to be enqueued even when max input queue size has been reached. This is supported on low ends. In addition to the headroom, high end platforms have an extended headroom for L2 keepalives and IGPs.

- dropping packets based on the size of the low priority IP packet queue which is global (not specific to the inbound interface). This is not supported on the low ends.

Check this link for more information on SPD details...

http://www.cisco.com/warp/customer/63/spd.html

Regards

Kiruba

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