D-Link DGS-1510 Series Reference Manual page 614

DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide
Level: 12.
Usage Guideline
If the specified speed is not supported by the hardware, error messages will be returned. For a
1000BASE-T connection, if the speed is specified to 1000 Mbps, the port must be configured as
master or slave.
If speed is set to 1000 Mbps, or 10 Gbps, then the duplex mode cannot be set to half-duplex. If the
duplex mode is set to half-duplex, then the speed cannot be set to 1000 Mbps, or 10 Gbps.
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. The advertised capability will be both full and half-duplex mode
combined with the configured speeds.
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 eth1/0/1 to only auto-negotiate to 10 or 100 Mbps.
Switch# configure terminal
Switch(config)# interface eth1/0/1
Switch(config-if)# speed auto 10,100
Switch(config-if)#
69-5 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.
Command Default Level
Level: 12.
Usage Guideline
Use this command to enable automatically downgrading advertised speed in case a link cannot be
established at the available speed.
Example
This example shows how to enable speed auto-downgrade.
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