Supervisor TXQueue Drop statistics ?

[tiwang]

Hi out there

on our 3750 we have drops on some SuperVisor TxQueue's - can some tell me what the impact of this is:

Supervisor TxQueue Drop Statistics

    Queue  0: 0

    Queue  1: 0

    Queue  2: 0

    Queue  3: 931

    Queue  4: 0

    Queue  5: 0

    Queue  6: 0

    Queue  7: 0

    Queue  8: 5923

    Queue  9: 0

    Queue 10: 209981

    Queue 11: 0

    Queue 12: 0

    Queue 13: 0

    Queue 14: 0

    Queue 15: 0

distrib-sw-001#sh controllers cpu-interface   

ASIC    Rxbiterr   Rxunder    Fwdctfix   Txbuflos   Rxbufloc   Rxbufdrain

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

ASIC0     0          0          0          0          0          0        

ASIC1     0          0          0          0          0          0        

ASIC2     0          0          0          0          0          0        

ASIC3     0          0          0          0          0          0        

ASIC4     0          0          0          0          0          0        

ASIC5     0          0          0          0          0          0        

ASIC6     0          0          0          0          0          0        

cpu-queue-frames  retrieved  dropped    invalid    hol-block  stray

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

rpc               3094348    0          0          0          0        

stp               4425461    0          0          0          0        

ipc               0          0          0          0          0        

routing protocol  48116512   0          0          0          0        

L2 protocol       484863     0          0          0          0        

remote console    0          0          0          0          0        

sw forwarding     7          0          0          0          0        

host              591827     0          0          0          0        

broadcast         2516086    0          0          0          0        

cbt-to-spt        0          0          0          0          0        

igmp snooping     46039637   0          0          0          0        

icmp              0          0          0          0          0        

logging           0          0          0          0          0        

rpf-fail          0          0          0          0          0        

queue14           0          0          0          0          0        

cpu heartbeat     21985091   0          0          0          0   

we are running (C3750-IPBASE-M), Version 12.2(25)SEE2

[Jayakrishna Mada]

Hi,

Based on the outputs the drops are in routing protocol, broadcast and igmp snooping queues. Its expected to see some drops on Supervisor queues as the queue depth is low and the CPU process time for each Queue is also little low.

With that said I have seen scenarios where the drops were incrementing and did not see any impact.

So the question is are you seeing any impact on any of the "routing protocol, broadcast and igmp snooping" protocols ? Are these counters incrementing by a big number ?

Obviously too much broadcast is also not good so you might have to check that out.

One other command that will help identify the traffic hitting the cpu queues is : show buffer pool RXQ4 packet.

The queue number range is 0 -15. In your case you might want to check queue 4 , 8 and 10.

Hope that helps.

JayaKrishna