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Beginner

Catalyst 3650 IOS-XE 3.6 MTU change without reload the switch

Hello, 

did someone of you notice that change of MTU to jumbo frames with system mtu 9198 could be done without reload?

Platform: Catalyst 3650 IOS-XE 3.6 

But Configuration Guide listed that reload is required.

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4 REPLIES 4
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VIP Mentor

if it states reload its

if it states reload its probably best to do it , does your show system mtu show the value changed to 9198 before the reload

Highlighted
Beginner

please, look at this log

please, look at this log:

switch#show system mtu
Global Ethernet MTU is 1500 bytes.

switch#config term
Enter configuration commands, one per line.  End with CNTL/Z.
switch(config)#system mtu 9198
Global Ethernet MTU is set to 9198 bytes.
Note: this is the Ethernet payload size, not the total
Ethernet frame size, which includes the Ethernet
header/trailer and possibly other tags, such as ISL or
802.1q tags.

switch(config)#end
switch#show system mtu
Global Ethernet MTU is 9198 bytes.

Highlighted
VIP Mentor

ye looks good usually you

ye looks good usually you would see this line ----Changes to the system MTU will not take effect until the next reload is done

Still to be sure I would span a port and make sure you see your mtu of 9198 in a packet and if you do your good but if not I would reload or test with an extended ping with mtu value set

Highlighted
Beginner

Working good in jumbo packet

Working good in jumbo packet environment.

Tested also with extended ping.

Without any reload.

 

During setting MTU size switch went port-by-port and disconnected host for a while.

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