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Webcast-Catalyst9k
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Sho interfaces summary output explanation

Any one can explain the output of this command ? IQD is input drops. What does that mean ? why these drops ? how can I improve this interface ?

sho interface vlan2 summary

*: interface is up

IHQ: pkts in input hold queue IQD: pkts dropped from input queue

OHQ: pkts in output hold queue OQD: pkts dropped from output queue

RXBS: rx rate (bits/sec) RXPS: rx rate (pkts/sec)

TXBS: tx rate (bits/sec) TXPS: tx rate (pkts/sec)

TRTL: throttle count

Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL

---------------------------------------------------------------------

* Vlan2 0 976 0 0 7800000 2476 2336000 1352 0

1 REPLY

Re: Sho interfaces summary output explanation

Hi,

Input queue drops are a result of too much traffic hitting that port and the input queue buffers filling up.

Not sure what sort of port this is on, but you may want to look into moving off some of

your traffic to a different port in a different vlan where you're not seeing drops.

What you can do to stop the drops is increase the input queue buffer size from the default

which is 75 to the max which is 4096. Just go into config mode and get into the vlan

interface then add the following "hold-queue 4096 in" then just write to memory and you

should see the drops stop. If you would like to know what type of packets are flooding

your input queue on that interface here is a good link for further investigation into the

matter.

http://www.cisco.com/warp/customer/63/queue_drops.html

Regards,

~JG

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