I have an etherchannel interface from our 6509 core to our 3750 distribution stack. On the 6509 I'm seeing a lot of input queue drops/flushes. The input traffic on this interface is never that high (the etherchannel consists of 3 1GB Fiber ports), the input is usually around 10Mb. The output utilization is much higher (few hundred MB average). I can't figure out why I get these input drops? Is there a way for me to figure out what's dropping?
here is the output of sh int po 7, as you can see I have about 4316 drops and I just cleared the counters 5 minutes ago:
Port-channel7 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 0019.0761.4400 (bia 0019.0761.4400)
Description: uplink to Access Switch
Internet address is 172.16.14.182/30
MTU 1500 bytes, BW 3000000 Kbit, DLY 10 usec,
reliability 255/255, txload 18/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
input flow-control is off, output flow-control is off
Members in this channel: Gi3/1 Gi3/2 Gi3/3
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:26:57
Input queue: 0/75/4316/4316 (size/max/drops/flushes); Total output drops: 0
The ports I'm using are on module 3, ports 1, 2 and 3. the module is WS-X6724-SFP. The etherchannel on the 3750 is set up with 1 fiber port per stack switch (3 switches in a stack, 1 port each). How can I tell if they use the same asic?
Also, the etherchannel is configure in mode on (channel-group 7 mode on) on both switches.
I still haven't replaced any of the three cables but I'm wondering if could still be cable issue if there are no errors on any of the interfaces? I'm still getting these drops flushes, here's another output a few mins after I cleared the interfaces:
Input queue: 0/75/4145/4145 (size/max/drops/flushes); Total output drops: 0
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...