I've never heard of SPD, but as usual a quick search at CCO gave results:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/ios112p/xprn
112/141503.htm
New Features in Release 11.2(5)P:
Selective Packet Discard (SPD)
http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/ios112p/xprn
112/141503.htm#xtocid2187540
I have a feeling that this may have been phased out though with other router
switching/queuing technologies taking it's place (FIFO, WFQ, CBWFQ, WRED,
etc.).
--
Jason Roysdon, CCNP/CCDP, MCSE, CNA, Network+, A+
List email: [EMAIL PROTECTED]
Homepage: http://jason.artoo.net/
Cisco resources: http://r2cisco.artoo.net/
"Adam Quiggle" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi everyone,
>
> I'm trying to find information regarding SPD and am having a heck of
> time. Here is what I've found so regarding SPD (selective packet
discard):
>
> Selective Packet Discard
> -----------------------------
> When in severe overload conditions, routers that cannot keep up with the
> incoming packet stream must drop packets. If no intelligence is applied to
> choosing which ones to discard, this will impact the stability of routing
> protocols. This feature applies some simple choices to selectively discard
> packets likely to be unimportant for routing and interface stability. SPD
> is enabled by default; there are no commands or configuration tasks
required.
>
> The problem I have is that if I wanted to disable SPD (not that I'm
> suggesting you would want to) how would you go about doing it? I can't
> find any commands or documentation indicating how to do so. The only
> documentation I've been able to dredge up is about configuring spd for
> aggressive mode (allows a router to drop all packets that fail sanity
> check, bad checksums, bad ttl, etc.). Even then I can't seem to find an
> IOS that allows me to do so.
>
> My questions are:
>
> 1) Has anyone seen or used SPD and if so, under what circumstances?
> 2) What IOS version?
> 3) Is there a successor to SPD?
> 4) How come we don't hear about it more often?
>
> Thanks everyone,
> AQ
>
>
>
> **************************************************
> Adam Quiggle
> Senior Network Engineer
> MCI Worldcom/NOC/BP Amoco
> [EMAIL PROTECTED]
> **************************************************
>
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