sh platform port-asic stats drop

[Thiago Henriques]

All,

In our environment we have some HP chassis, and with them there are blade switches. Lately, we've been seeing some drops on few servers connected on the blade switch ports. The switch model is WS-CBS3120X-S. And below is the tx drop for two interfaces ( where the servers are connected to).

sh platform port-asic stats drop gi1/0/11

  Interface Gi1/0/11 TxQueue Drop Statistics

    Queue 0

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 1

      Weight 0 Frames 2570537

      Weight 1 Frames 0

      Weight 2 Frames 466

    Queue 2

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 3

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 908402

    Queue 4

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 5

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 6

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 7

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

dc7-blade-4-cluster#sh platform port-asic stats drop gi1/0/16

  Interface Gi1/0/16 TxQueue Drop Statistics

    Queue 0

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 1

      Weight 0 Frames 2420550

      Weight 1 Frames 0

      Weight 2 Frames 490

    Queue 2

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 3

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 849551

    Queue 4

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 5

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 6

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

    Queue 7

      Weight 0 Frames 0

      Weight 1 Frames 0

      Weight 2 Frames 0

I am having some trouble to understand why only Queues 1 & 3 have drops.

Thanks,

Thiago

[Arumugam Muthaiah]

Hi Thiago,

These are the egress queue on the interface, seeing this drops on this egress queue indicates that the port experiencing over subscription

To verify the error on Ingress and Egress ports

# show mls qos interface stats

To verify the queue mapping

# show mls qos maps dscp-output-q

check and tune the buffers

# show mls qos interface buffer -- (This identifies Queue-set assigned to this interface)

# show mls qos queue-set

(config)# mls qos queue-set output <> threshold -- ( to tune the buffers)

Packet drops don't always indicate a problem example, Gigbit servers can easily oversubscribe 100M client. Please analze the traffic pattern and tune the buffer if needed and set the thresholds to optimize high priority traffic.

Regards,

Aru

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