I have a 3560 switch connected to a 6506 switch using a port channel of 2 GB. Everything appears to be configured and working correctly, however, when I do a show interface on the po interface, it shows a very large number of input and output queue drops even though utilization is very low. See partial output below. I am attaching the show interface results of the port channels on both the 6506 and the 3560 as well as the configurations of the port channels and the interfaces associated with them. The 3560 port channel interface doesn't show any drops or errors and only one of the interfaces in the port channel (54) shows drops or errors.
Port-channel54 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 001d.a246.05e6 (bia 001d.a246.05e6)
Description: 2GB Uplink to STL-I9-3560-4
MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,
reliability 255/255, txload 2/255, rxload 3/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
input flow-control is off, output flow-control is off
Members in this channel: Gi2/8 Gi3/7
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters 02:49:50
Input queue: 0/2000/16384000/0 (size/max/drops/flushes); Total output drops: 427687936
This is just one of 24 3560s that is dual redundantly attached to 2 6506s. Every 3560 has a 2G uplink to each 6506 through direct fiber. The module is a 48 port SFP module. I am using 1,3,5, etc. on this module (3 below) and 2,4,6, etc. on a second blade (2 below). The strange thing is that it appears to only be a handful of the odd ports on just one switch that seem to be having issues.
I would say this looks like some type of media problem . Port channel 54 is showing over 4 billion runts on it in less than 3 hours . Check the interfaces on the port channel for errors with the "show interface counters errors" command . Looks like the recieve side where port channel 54 is .
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