Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 321
Auto-Negotiation on Ethernet Interfaces, Setting speed and duplex mode of Ethernet Interfaces
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Auto-Negotiation on Ethernet Interfaces Setting speed and duplex mode of Ethernet Interfaces By default, auto-negotiation of speed and duplex mode is enabled on 10/100/1000 Base-T Ethernet interfaces. Only 10GE interfaces do not support auto-negotiation. When using 10GE interfaces, verify that the settings on the connecting devices are set to no auto-negotiation. Note: Starting with FTOS 7.8.1.0, when a copper SFP2 module with catalog number GP-SFP2-1T is used in the S25P model of the S-Series, its speed can be manually set with the speed command. When the speed is set to 10 or 100 Mbps, the duplex command can also be executed. The local interface and the directly connected remote interface must have the same setting, and auto-negotiation is the easiest way to accomplish that, as long as the remote interface is capable of auto-negotiation. Note: As a best practice, Dell Force10 recommends keeping auto-negotiation enabled. Auto-negotiation should only be disabled on switch ports that attach to devices not capable of supporting negotiation or where connectivity issues arise from interoperability issues. For 10/100/1000 Ethernet interfaces, the negotiation auto command is tied to the speed command. Auto-negotiation is always enabled when the speed command is set to 1000 or auto. To discover whether the remote and local interface require manual speed synchronization, and to manually synchronize them if necessary, use the following command sequence (see Figure 15-32 on page 322): Step 1 2 3 4 5 6 7 8 Task Command Syntax Determine the local interface status. See Figure 15-31. show interfaces [interface | linecard slot-number] status Determine the remote interface status. [Use the command on the remote system that is equivalent to the above command.] Access CONFIGURATION mode. config Access the port. interface interface slot/port Set the local port speed. speed {10 | 100 | 1000 | auto} Optionally, set full- or half-duplex. duplex {half | full} Disable auto-negotiation on the port. If the speed was set to 1000, auto-negotiation does not need to be disabled. no negotiation auto Verify configuration changes. show config Command Mode EXEC Privilege EXEC EXEC Privilege EXEC Privilege CONFIGURATION INTERFACE INTERFACE INTERFACE INTERFACE Interfaces | 321
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