Enabling Jumbo Frames

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 (Virtual LAN), 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.

Published March 2020prev | next

Email this topic

Print this page Print this page

Leave feedback Feedback