Adam ,
SPD is limited to certain packets , this is what I
found in an old email ;
When process switching to repopulate caches after
aroute or interface flap, the code currently throttles
(temporarily disables) interfaces that reach 75
packets on their process level input queue. As
BGP,IGP, and keep-alive packets are a very small
percentage of the total traffic being presented to the
router under these circumstances, the current
throttling mechanism will likely throw these packets
away. We then lose peers and/or adjacencies, more
routes flap, we continue to
invalidate parts of the cache, our neighbors then lose
routes as well, and the world goes to hell. The basic
idea behind Selective Packet Discard (SPD) is this: if
we mark all BGP and IGP packets as being "important"
by using the precedence bits in the IP header, and
prefer
enqueuing these packets over others, we should process
a larger percentage of the packets that will allow
routing and, consequently, the caches to stabilize.
show ip spd
show int <blabla> switching' has some extra info too.
flem
--- Adam Quiggle <[EMAIL PROTECTED]> wrote:
> At 04:11 PM 1/14/01, J Roysdon wrote:
> >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/
>
> Except that I've seen it get disabled in IOSes as
> late as IOS 12.0(5)T
> running WFQ.....
>
> Router>show ver
> Cisco Internetwork Operating System Software
> IOS (tm) 2500 Software (C2500-JOS56I-L), Version
> 12.0(5)T, RELEASE
> SOFTWARE (fc1)
> Copyright (c) 1986-1999 by cisco Systems, Inc.
> Compiled Fri 23-Jul-99 10:41 by kpma
> Image text-base: 0x0306BE34, data-base: 0x00001000
>
> ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
> BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R),
> Version 11.0(10c), RELEASE
> SOFTWARE (fc1)
>
> Router uptime is 3 hours, 34 minutes
> System returned to ROM by power-on
> System image file is
> "flash:/c2500-jos56i-l.120-5.T.bin"
>
> cisco 2500 (68030) processor (revision N) with
> 14336K/2048K bytes of memory.
> Processor board ID 06107486, with hardware revision
> 00000000
> Bridging software.
> X.25 software, Version 3.0.0.
> SuperLAT software (copyright 1990 by Meridian
> Technology Corp).
> TN3270 Emulation software.
> 1 Ethernet/IEEE 802.3 interface(s)
> 2 Serial network interface(s)
>
> Router>ena
> Router#conf t
> Enter configuration commands, one per line. End
> with CNTL/Z.
> Router(config)#vpdn enable
> % SPD temporarily disabled. Not compatible with VPDN
> Router(config)#
> Router#show queueing
> Current fair queue configuration:
>
> Interface Discard Dynamic
> Reserved
> threshold queue count
> queue count
> Serial0 64 256 0
> Serial1 64 256 0
>
> Current priority queue configuration:
> Current custom queue configuration:
> Current random-detect configuration:
>
> AQ
>
>
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