A 3750G is experiencing random packet loss. Random meaning the packet loss doesn't occur at a regular interval or time of day. I lose L3 connectivity to it but L2 is fine during the packet loss time meaning,
Given this topology,
3750G <--- L2 etherch 2 Gig ---> 6509 Switch B <--- L3 ether 5Gig ---> 6513 Core <--- L3 5 Gig ---> 6509 Switch C ----> host
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L2 etherch 2 Gig
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Another 3750
During the packet loss the host cannot ping the ip of 3750, but the host can telnet to Switch B, then telnet to 3750. There have been other times when I was already logged into the 3750, got a solarwinds alert about packet loss but still stayed connected from host to 3750 but then the 3750 cannot ping passed Switch B. I then keep trying to ping from 3750 to a server in the Core but don't get any replies, around 20-30 secs later I get some replies some fails, then 20-30 secs later I get all successful ping replies and it stays that way for a little while.
I don't see any dropped packets though on the port channel between 3750 and Switch B, the port channels are in full duplex.
Full-duplex, 1000Mb/s, link type is auto, media type is unknown
input flow-control is off, output flow-control is unsupported
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 28000 bits/sec, 16 packets/sec
5 minute output rate 2000 bits/sec, 4 packets/sec
1062321 packets input, 245723900 bytes, 0 no buffer
Received 885281 broadcasts (768954 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 768954 multicast, 0 pause input
0 input packets with dribble condition detected
326538 packets output, 51689583 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
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
Full-duplex, 1000Mb/s, media type is unknown
input flow-control is off, output flow-control is off
Members in this channel: Gi1/5 Gi1/6
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
I've tried swapping out the 3750 for another 3750 and still have the same problem.
The switch I've labeled "Another 3750" has had no packet loss issues which has the same vlans as the 3750G, plus 1 or two different vlans.
How do I go about debugging this?
