D-Link DGS-3630-28SC Manual - Page 1465
speed auto-downgrade
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide Default The speed is automatic for 100BASE-TX, 1000BASE-T and 10GBASE-T interfaces. The speed is fixed to 100Mbps for 100BASE-FX interfaces. The speed is fixed to 1000Mbps for 1000BASE-SX/LX interfaces. Command Mode Interface Configuration Mode. Command Default Level Level: 12. Usage Guideline If the specified speed is not supported by the hardware, error messages will be returned. For the 100BASE-FX modules, the speed is always fixed at 100Mbps, full duplex, and no-negotiation. No command can change the settings. For the 1000BASE-SX/LX modules, the speed is always fixed to 1000Mbps and full duplex, and only the speed 1000 and speed auto commands are valid. For a 1000BASE-T connection, if the speed is specified to 1000Mbps, the port must be configured as master or slave. For a 10GBASE-T connection, if the speed is specified to 10Gbps, the port must be configured as master or slave. Auto-negotiation will be enabled if either the speed parameter is set to auto, or the duplex parameter is set to auto. If the speed parameter is set to auto, and the duplex parameter is set to the fixed mode. Only the speed will be negotiated. The advertised capability will be configured to the duplex mode combined with all the possible speeds. If the speed is to set to a fixed speed and duplex is set to auto, only the duplex mode is negotiated. For 10GBASE-R connections, if auto-negotiation is enabled, the system will automatically configure the speed (1000M or 10G) according to the type of SFP/SFP+. Example This example shows how to configure ethernet 1/0/1 to only auto-negotiate to 10Mbps or 100Mbps. Switch# configure terminal Switch(config)# interface ethernet 1/0/1 Switch(config-if)# speed auto 10,100 Switch(config-if)# 116-6 speed auto-downgrade This command is used to enable automatically downgrading advertised speed in case a link cannot be established at the available speed. Use the no form of this command to disable it. speed auto-downgrade no speed auto-downgrade Parameters None. Default By default, this option is disabled. Command Mode Interface Configuration Mode. 1460
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