Jumbo Frames - Extreme Networks ExtremeWare XOS Guide Manual

NOTE
A link down or up event may trigger Spanning Tree Protocol topology changes or transitions.
Turning Off Autonegotiation on a Gigabit Ethernet Port
In certain interoperability situations, you may need to turn autonegotiation off on a fiber gigabit
Ethernet port. Although a gigabit Ethernet port runs only at full duplex, you must specify the duplex
setting.
The following example turns autonegotiation off for port 1 (a 1 Gbps Ethernet port) on a module
located in slot 1 of a modular switch:
configure ports 1:1 auto off duplex full
The 10 Gbps ports do not autonegotiate; they always run at full duplex and 10 Gbps speed.
Table 13 lists the support for autonegotiation, speed, and duplex setting for the various types of ports.
Table 13: Support for autonegotiation on various ports
Port
10 Gbps
10/100/1000 Mbps
1 Gbps fiber SFP GBIC

Jumbo Frames

Jumbo frames are Ethernet frames that are larger than 1522 bytes, including four bytes used for the cyclic
redundancy check (CRC). Extreme 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.
You need jumbo frames when running the Extreme Networks VMAN implementation. When you are
working on the BlackDiamond 10K switch, the switch enables jumbo frames when you configure
VMANs. If you are working on the Aspen 8810 switch, you enable jumbo frames for the entire switch
prior to configuring VMANs. For more information on configuring VMANs, refer to
Refer to "Displaying Port Configuration Information"
ExtremeWare XOS 11.1 Concepts Guide
Autonegotiation
Off
On (default)
Off
On (default)
Off
Speed
10000 Mbps
10 Mbps
100 Mbps
1000 Mbps
for information on displaying jumbo frame status.

Jumbo Frames

Duplex
Full duplex
Full/half duplex
Full/half duplex
Full duplex
Chapter 8.
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