Note
Some network interface cards (NICs) have a configured
maximum MTU size that does not include the additional 4 bytes of CRC. Ensure that the NIC
maximum MTU size is at or below the maximum MTU size configured on the switch. Frames that
are larger than the MTU size configured on the switch are dropped at the ingress
port.
To enable jumbo frame support, enable jumbo frames on the desired
ports:
-
To set the maximum jumbo frame size, use the following
command:
configure
jumbo-frame-size framesize
The jumbo frame size range is 1,523 to 9,216. This value describes
the maximum size of the frame in transit (on the wire), and includes 4 bytes of
CRC.
Note
For Tagged Packets, the maximum frame size supported
is 9,220 bytes, which includes 4 bytes of cyclic redundancy check (CRC), plus another
4 bytes.
-
To set the MTU size for the VLAN, use the following command:
configure
ip-mtu mtu
vlan
vlan_name
-
Next, enable support on the physical ports that will carry
jumbo frames using the following command:
enable
jumbo-frame ports [all | port_list]
You can enable or disable jumbo frames for
individual ports before configuring the VMANs.
