How to troubleshoot input queue drop continuously on Cisco7600?
> Last clearing of “show interface” counters 00:12:35
> Input queue: 0/200/69739/69739 (size/max/drops/flushes); Total
> drops: 0
On this platform those drops could be for traffic forwarded to the CPU.
What does the interface configuration look like? Is it a L3 interface (“no switchport”), or is it a L2 interface? If the latter, and you have SVIs (VLAN interfaces) for some of the VLANs it carries, look for drops on those SVIs.
If they are “microburst” drops on L3-interfaces then you can possibly mitigate it using “hold-queue <N> in” on the L3-interfaces (SVIs or the “no switchport” interface itself). This is a trade-off; don’t use a too high setting for input-queue or you will get other problems.
You could use a SPAN session to look at what traffic might cause this.
The SPAN replication is before traffic is forwarded to the CPU so you should be able to see floods.
> 1 4 CEF720 4 port 10-Gigabit Ethernet WS-X6704-10GE
This card has rather small queues so it might simply be microbursts. In that case you might have to find a port on another card.
For general info about input queue drops this is a good read:
I’d suggest using NetDR to find out.
On Mon, Oct 20, 2014 at 9:42 PM, PlaWanSai RMUTT CPE IX <