[c-nsp] Runts in the network

[masood at nexlinx.net.pk]

you know these are frames with a frame size between 8 and 63 bytes with a
valid CRC and no alignment errors. if this is the case, you may or may not
have a problem. depending on the type of equipment, the vendor maybe using
nonstandard frames. these frames are interpreted as runts. however, runts
may be caused by a malfunctioning interface.

in ATM cells have a 48 byte information field and a 5 byte header. This 53
byte cell falls within the definition of a under size packet and may be
counted as a runt.

find out what you have "a bad ethernet card or atm" :)

Regards,
Masood
Blog: http://weblog.com.pk/jahil/


>
> Any ideas how to troubleshoot this ?
>
> Thanks.
>
> Regards,
>
> Antonio Soares, CCIE #18473 (R&S)
> amsoares at netcabo.pt
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Antonio Soares
> Sent: terça-feira, 24 de Novembro de 2009 11:46
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Runts in the network
>
> Hello Group,
>
> I have 7200's acting as PE's and running 12.4.23 that show an abnormal
> numbers of runts. The interfaces where this can be seen are
> E1 channel-groups configured for frame-relay. This is the typical
> configuration:
>
> !
> frame-relay switching
> !
> controller E1 x/y
>  channel-group 0 timeslots 1-31
> !
> interface Serialx/y:0
>  encapsulation frame-relay
>  frame-relay traffic-shaping
>  frame-relay lmi-type ansi
>  frame-relay ip rtp header-compression
>  frame-relay intf-type dce
> !
> interface Serialx/y:0.100 point-to-point
>  ip vrf forwarding MY-VRF
>  ip address x.x.x.x x.x.x.x
>  ip rip advertise 10
>  frame-relay interface-dlci 100
>   class MY-CLASS
>  frame-relay ip rtp header-compression
> !
>
> The E1 is completely clean but the serial interface shows runts:
>
> ROUTER#sh int sx/y:0
> Serialx/y:0 is up, line protocol is up
> (...)
>      Received 0 broadcasts, 12 runts, 0 giants, 0 throttles
>      12 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
> (...)
> ROUTER#
>
> This happens everywhere in the network and there are many 7200's. The PA
> is the PA-MC-8TE1+.
>
> What could be the source of the problem ? I know what a runt is but i
> would like to understand why i have it all over the network.
>
>
>
> Thanks.
>
> Regards,
>
> Antonio Soares, CCIE #18473 (R&S)
> amsoares at netcabo.pt
>
>
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