Im faced with an issue whereby if i ping -l 1600 X.X.X.X or with any packet lager than 1472 is not going to or through my switch it gets dropped.
C3560E Software (C3560E-UNIVERSALK9-M), Version 12.2(55)SE3
It seems everywhere else on the network i can ping with large packets but the moment i go through this switch then i cant.
What could be blocking this ?
Also, I though when the switch is configured mtu 1500 - this means that all frames smaller than 1500 will be allowed to go through and all frame larger will be fragmented before sending them out and not dropping frames at all ?
C3560E#sh interfaces gigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 30f7.0dcd.fc01 (bia 30f7.0dcd.fc01)
MTU 9198 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, 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 6000 bits/sec, 5 packets/sec
5 minute output rate 12000 bits/sec, 9 packets/sec
602264 packets input, 78045094 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
867234 packets output, 135589312 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
C3560E#
C3560E#sh int vlan 1
Vlan1 is up, line protocol is up
Hardware is EtherSVI, address is 30f7.0dcd.fc40 (bia 30f7.0dcd.fc40)
Internet address is 10.1.1.5/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
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 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 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
23728 packets input, 1971542 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
3938 packets output, 698719 bytes, 0 underruns
0 output errors, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
C3560E#
C3560E#sh run | i mtu
system mtu routing 1500
C3560E#
C3560E(config)#system mtu ?
<1500-1998> MTU size in bytes
jumbo Set Jumbo MTU value for GigabitEthernet or TenGigabitEthernet interfaces
routing Set the Routing MTU for the system
C3560E#sh system mtu
System MTU size is 1500 bytes
System Jumbo MTU size is 9198 bytes
System Alternate MTU size is 1500 bytes
Routing MTU size is 1500 bytes
C3560E#
