Specifications

72 ExtremeWare XOS 11.0 Concepts Guide

Configuring Slots and Ports on a Switch

The 10 Gbps ports do not autonegotiate; they always run at full duplex and 10 Gbps speed.

Table 14 lists the support for autonegotiation, speed, and duplex setting for the various types of ports.

Jumbo Frames

Jumbo frames are Ethernet frames that are larger than 1522 bytes, including four bytes used for the cyclic

redundancy check (CRC). Extreme Networks products support switching and routing of jumbo frames

at wire speed on all ports.

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.

You also use jumbo frames when configuring VMANs. For more information on configuring VMANs,

refer to Chapter 5.

Enabling Jumbo Frames

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 1523 to 9216. This value describes the maximum size of the frame in

transit (on the wire), and includes 4 bytes of CRC plus another 4 bytes if 802.1Q tagging is being used.

Set the MTU size for the specified VLAN, using 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>]

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.

Table 14: Support for autonegotiation on various ports

Port Autonegotiation Speed Duplex

10 Gbps Off 10000 Mbps Full duplex

10/100/1000 Mbps On (default)

Off 10 Mbps

100 Mbps

Full/half duplex

1 Gbps fiber SFP GBIC On (default)

Off 1000 Mbps Full duplex