I have a cisco 3400 ME switch which is dropping a lot of packets on one of its uplinks and customers are noticing the packet loss.
the switch has two gig uplinks, one has a tx/rx combined rate of445Mbps which never drops a packet, the other has a combined tx/rx throughput of 607mbps (give or take) and drops 100's of packets a second. i think the issue may be caused by the 3400 configured for jumbo frames and the 4507 running an MTU of 1500.
However lookign at the traffic patterns there is a huge difference in data transmitted than received, so what is the best way to check for loops on the switch? since the 3400 doesnt support STP on the UNI ports, what is th ebest way to check for loops? I have checked the mac table and there is no dupes, is there any other methods for tracking them down?
GigabitEthernet0/13 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 0021.d7ed.e60d (bia0021.d7ed.e60d) Description: xx MTU 9000 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 154/255, rxload 4/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP input flow-control is off, output flow-control is unsupported 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 8w5d Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 151923763 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 16614000 bits/sec, 13486 packets/sec 5 minute output rate 605606000 bits/sec, 118387 packets/sec 81890216650 packets input, 16901966809462 bytes, 0 no buffer Received 149312500 broadcasts (148384638 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 148384638 multicast, 0 pause input 0 input packets with dribble condition detected 508715659366 packets output, 360874240939303 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped out