Would you help me to understand the reason why Total Output Drops increasing on WAN interface fa0/0( facing to VPLS/L2 service link) on my 1841 router?
To my understanding there are two reasons that could cause this output drop counter increasing as follows.
1. speed/duplex setting that is not matching to the ether port that is directly facing to the equipment.
2. There is short burst of traffic coming in from LAN port that is exceeding 10M (in this case as the speed/duplex is hard-coded to 10M/Full)
Speed/duplex setting was varified that is matching, thus it should be the reason number 2 above, however, the LAN end is 10M and also the WAN interface is at the same speed,10M. How could a router would drop packets from the output queue when the LAN interface speed = WAN interface speed?