ATM output queue drops

Unanswered Question
Jun 11th, 2009

what is causes output queue drops:

ATM5/0.350: VCD: 103, VPI: 6, VCI: 350

VBR-NRT, PeakRate: 149000 (351416 cps), Average Rate: 120000 (283019 cps)

Burst Cells: 1

AAL5-LLC/SNAP, etype:0x0, Flags: 0x20, VCmode: 0x0

OAM frequency: 0 second(s), OAM retry frequency: 0 second(s)

OAM up retry count: 0, OAM down retry count: 0

OAM Loopback status: OAM Disabled

OAM Managed VC Status: Not Managed

ILMI Managed VC status: Not Managed

VC TxRingLimit: 4608 particles

VC Rx Limit: 800 particles

InARP frequency: 15 minute(s)

Transmit priority 4

InPkts: 13275, OutPkts: 2135936, InBytes: 1491713, OutBytes: 1209650930

InCells: 38340, OutCells: 26210241

InPRoc: 10866, OutPRoc: 459

InFast: 2409, OutFast: 2135477, InAS: 0, OutAS: 0

InPktDrops: 0, OutPktDrops: 678/0/678 (holdq/outputq/total)

InCellDrops: 0, OutCellDrops: 0

InByteDrops: 0, OutByteDrops: 0

CrcErrors: 0, SarTimeOuts: 0, OverSizedSDUs: 0, LengthViolation: 0, CPIErrors: 0

Out CLP=1 Pkts: 0, Cells: 0

OAM cells received: 0

F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0

F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI: 0

OAM cells sent: 0

F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0

F4 OutEndloop: 0, F4 OutSegloop: 0, F4 OutRDI: 0

OAM cell drops: 0

Status: UP

Packets are being switched on a NPE-G1 from a gig to ATM interface at a very low rate (10 Mbps)

I have this problem too.
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Paolo Bevilacqua Thu, 06/11/2009 - 09:38

Are there other VCs on the interface ?

Since your input interface is so much faster than the VC, any traffic burst can cause drops.

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