Hi,
I have two C3560G switches called sw-2 and sw-4 connected with Port-channel (PAgP). MTU 9000 is set on the switch globally and it looks like it is also enabled for Po1:
(Output is the same on both switches)
System MTU size is 1500 bytes
System Jumbo MTU size is 9000 bytes
Routing MTU size is 1500 bytes
From sw-2:
sw-2#sh int Po1
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 001e.f68e.9898 (bia 001e.f68e.9898)
Description: TRUNK -> SW-4
MTU 9000 bytes, BW 2000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Full-duplex, 1000Mb/s, link type is auto, media type is unknown
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi0/23 Gi0/24
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:01, output hang never
Last clearing of "show interface" counters never
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 6140000 bits/sec, 1839 packets/sec
5 minute output rate 12155000 bits/sec, 2188 packets/sec
116543372861 packets input, 70726547841331 bytes, 0 no buffer
Received 1798462569 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 958842236 multicast, 0 pause input
0 input packets with dribble condition detected
115947271755 packets output, 71481869333811 bytes, 0 underruns
0 output errors, 0 collisions, 1 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
From sw-4:
sw-4#sh int Po1
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 001e.f6fd.ee97 (bia 001e.f6fd.ee97)
Description: TRUNK -> SW-2
MTU 9000 bytes, BW 2000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Full-duplex, 1000Mb/s, link type is auto, media type is unknown
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi0/23 Gi0/24
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:00, output hang never
Last clearing of "show interface" counters never
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 11992000 bits/sec, 2144 packets/sec
5 minute output rate 6019000 bits/sec, 1792 packets/sec
115947341733 packets input, 71481922016577 bytes, 0 no buffer
Received 1361196492 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 214241433 multicast, 0 pause input
0 input packets with dribble condition detected
116543428788 packets output, 70726574257109 bytes, 0 underruns
0 output errors, 0 collisions, 1 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
Now, I am trying to ping host connected to sw-4 from a host connected to sw-2 with ping 10.66.48.4 -M do -s 8972 but the packages are not getting there, not response from other host. It works fine when using MTU 1500 and it also works with MTU 9000 if both hosts are connected to sw-4. Is there anything I missed? I am able to provide more information if you need it.
