Following the ASE template (https://ase.arubanetworks.com/solutions/id/134), I see the following commands:
jumbo max-frame-size 1584
jumbo ip-mtu 1584
However, upon entering the 2nd command, I get this error:
"IP-MTU size must be 18 bytes lesser than max-frame-size."
So, is the correct version:
1)
jumbo max-frame-size 1602
jumbo ip-mtu 1584
...OR...
2)
jumbo max-frame-size 1584
jumbo ip-mtu 1566
EDIT (additional question):
I'm also trying to understand the reason for 1584 bytes. Here's how I add it up in a worst case scenario where both the outer and inner Ethernet frames include a 4 byte 802.1Q tag:
Ethernet + .1Q (outer): 22 bytes
IP (outer) + GRE: 24 bytes
Ethernet + .1Q (inner): 22 bytes
IP (inner) + payload: 1500 bytes
Total outer frame size: 1568 bytes
Total outer IP size: 1546
So where does 1584 come from?