Default Auto-Negotiation Behavior

The default Auto-Negotation behavior depends on the switch model, port type, and transceiver type. The following table provides the default combinations.

Table 1. 5520 Series default behavior

Model

Port type

Transceiver type

Auto-Negotiation

FEC

5520-24T, 5520-48T, 5520-24W, and 5520-48W

1GBASE-T

Enabled

5520-12MW-36W

100M/1/2.5/5/10Gbps Copper

Enabled

5520-48SE

SFP

100BASE-FX

N/A

1GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Enabled

5520-24X

SFP+

1GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Disabled

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G SFP+

N/A

5520-VIM-4X and 5520-VIM-4XE

SFP+

1GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Disabled

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G SFP+

N/A

5520-VIM-4YE

SFP28

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G SFP+

N/A

25G DAC

Enabled

FEC is negotiated requesting CL108.

25G AOC

N/A

FEC auto: CL108

25G SFP28

N/A

FEC auto: CL108

Table 2. VSP 4900 Series default behavior

Model

Port type

Transceiver type

Auto-Negotiation

FEC

VSP4900-48P

1GBASE-T

Enabled

VSP4900-24S

SFP

100BASE-FX

N/A

1GBASE-T

Enabled

1G SFP

Enabled

VSP4900-24XE

SFP+

100BASE-FX

N/A

1GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Disabled

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G SFP+

N/A

VSP4900-12MXU-12XE

100M/1/2.5/5/10Gbps Copper

Enabled

SFP+

100BASE-FX

N/A

1GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Disabled

10GBASE-T

Enabled

10G DAC

Disabled

10G SFP+

N/A

VIM5-4X

SFP+

1GBASE-T

Not Supported

1G SFP

Disabled

10GBASE-T

Enabled

10G DAC

Disabled

10G SFP+

N/A

VIM5-4XE

SFP+

1GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Disabled

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G SFP+

N/A

VIM5-2Y and VIM5-4Y

SFP28

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G SFP+

N/A

25G DAC

Disabled

Not Supported

25G AOC

N/A

Not Supported

25G SFP28

N/A

Not Supported

VIM5-4YE

SFP28

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G SFP+

N/A

25G DAC

Enabled

FEC is negotiated requesting CL108.

25G AOC

N/A

FEC auto: CL108

25G SFP28

N/A

FEC auto: CL108