[j-nsp] fabric drops ?

[Josef Buchsteiner]

fabric drops are in general a big aggregate counter for many different
issues.  It  is  in most the cases far less an issue then it may sound
like.  If you want to break this up I strongly suggest that you create
a  case  with JTAC so they can have a look on the router. Also in case
you  have  FCS  errors  on  the  sonet link they will end up as fabric
drops.  Since  FCS  is  the  last  thing you do part of the packet are
already  deep  in  the  forward-complex  so  the ingress will tell the
fabric  there  is no need to forward this further since I noticed this
packets  has  an  error  hence trash it .... just as an example of one
contributor of fabric drops...

Wednesday, May 12, 2004, 6:59:10 PM, you wrote:

JF> Hi,

JF> does anyone know what fabric drops are ? (see last line)

JF> we have this counter increasing on all of our routers, but
JF> one of them has much more than the
JF> others.

JF> Can someone point me on the exact definition of this ? Thanks.

jfl at RE0.BB1.COU>> show pfe statistics traffic
JF> PFE Traffic statistics:
JF>         7887025183350 packets input  (1505803 packets/sec)
JF>         7861203968641 packets output (1492453 packets/sec)

JF> PFE Local Traffic statistics:
JF>   675057223 local packets input
JF>   675182639 local packets output
JF>           0 software input high drops
JF>         187 software input medium drops
JF>           0 software input low drops
JF>           0 software output drops
JF>   393287161 hardware input drops

JF> PFE Local Protocol statistics:
JF>           0 hdlc keepalives
JF>           0 atm oam
JF>           0 fr lmi
JF>    11617138 ppp lcp/ncp
JF>     5507027 ospf hello
JF>     3656359 rsvp hello
JF>    19263171 isis iih

JF> PFE Hardware Discard statistics:
JF>           0 timeout
JF>           0 truncated key
JF>           0 bits to test
JF>           0 data error
JF>           0 stack underflow
JF>           0 stack overflow
JF>  4180034742 normal discard
JF>           0 extended discard
JF>       22104 invalid iif
JF>           0 info cell drops
JF>    61875452 fabric drops


JF> --
JF> Jerome Fleury
JF> _______________________________________________
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