Owner's Manual

122 | Chapter 5. Configuring Slots and Ports on a Switch
NETGEAR 8800 User Manual
Under certain conditions, you might opt to turn autopolarity off on one or more ports. The
following example turns autopolarity off for ports 5 to 7 on an XCM8806 series switch:
configure ports 6:5-6:7 auto-polarity off
When autopolarity is disabled on one or more Ethernet ports, you can verify that status using
the command:
show ports information detail
Jumbo Frames
Jumbo frames are Ethernet frames that are larger than 1522 bytes, including four bytes used
for the cyclic redundancy check (CRC). NETGEAR products support switching and routing of
jumbo frames at wire-speed on all ports. The configuration for jumbo frames is saved across
reboots of the switch.
Jumbo frames are used between endstations that support larger frame sizes for more
efficient transfers of bulk data. Both endstations involved in the transfer must be capable of
supporting jumbo frames. The switch only performs IP fragmentation, or participates in
maximum transmission unit (MTU) negotiation on behalf of devices that support jumbo
frames.
Guidelines for Jumbo Frames
For information on displaying jumbo frame status, see Displaying Port Information on
page 148.
Enabling Jumbo Frames per Port
You can enable jumbo frames per port.
When you configure vMANs on NETGEAR 8800 series switches, you can enable or disable
jumbo frames for individual ports before configuring the vMANs.
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.