Default Auto-Negotiation Behavior

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

Table 1. 5320 Series default behavior

Port type

Model

Transceiver type

Auto-Negotiation

FEC

10/100/1000Base-T

5320-24P-8XE

5320-24T-8XE

5320-48P-8XE

5320-48T-8XE

5320-16P-4XE

5320-16P-4XE-DC

Enabled

First 4 XE SFP+

Note:

By default, the first 3 XE ports on the 24- and 48-port models are not available for front panel use because they are reserved for Advanced Feature Bandwidth Reservation.

5320-24P-8XE

5320-24T-8XE

5320-48P-8XE

5320-48T-8XE

5320-16P-4XE

5320-16P-4XE-DC

100M No 100M support

1GBASE-T

Enabled.

The operational state is always enabled regardless of configuration.

1G SFP

Not Supported

10GBASE-T

Enabled.

The operational state is always enabled regardless of configuration.

10G DAC

Not Supported

10G SFP+

Last 4 XE SFP+

5320-24P-8XE

5320-24T-8XE

5320-48P-8XE

5320-48T-8XE

100M

100FX part number 10063 only

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

Not Supported

10G SFP+

Table 2. 5420 Series default behavior

Port type

Model

Transceiver type

Auto-Negotiation

FEC

10/100/1000Base-T

5420F-24T-4XE

5420F-24P-4XE

5420F-48T-4XE

5420F-48P-4XE

5420F-48P-4XL

5420F-8W-16P-4XE

5420F-16W-32P-4XE

5420M-16MW-32P-4YE

5420M-24W-4YE

5420M-48W-4YE

5420M-24T-4YE

5420M-48T-4YE

5420M-16MW-32P-4YE

Enabled

100M/1/2.5Gbps Copper

5420F-16MW-32P-4XE

5420M-16MW-32P-4YE

Enabled

SFP

5420F-24S-4XE

100BASE-FX

1GBASE-T

Enabled

1G SFP

Enabled

SFP+

5420F-24T-4XE

5420F-24P-4XE

5420F-48T-4XE

5420F-48P-4XE

5420F-48P-4XL

5420F-8W-16P-4XE

5420F-16W-32P-4XE

5420F-16MW-32P-4XE

5420F-24S-4XE

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+

SFP28

5420M-24W-4YE

5420M-48W-4YE

5420M-24T-4YE

5420M-48T-4YE

5420M-16MW-32P-4YE

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+

25G DAC

Enabled

FEC is negotiated requesting CL108

25G AOC

FEC auto:CL108

25G SFP28

FEC auto:CL108

SFP-DD

5420F-24T-4XE

5420F-24P-4XE

5420F-48T-4XE

5420F-48P-4XE

5420F-48P-4XL

5420F-8W-16P-4XE

5420F-16W-32P-4XE

5420F-24S-4XE

5420M-16MW-32P-4YE

5420M-24W-4YE

5420M-48W-4YE

5420M-24T-4YE

5420M-48T-4YE

5420M-16MW-32P-4YE

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+

Table 3. 5520 Series default behavior

Port type

Model

Transceiver type

Auto-Negotiation

FEC

1GBASE-T

5520-24T

5520-48T

5520-24W

5520-48W

Enabled

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

5520-12MW-36W

Enabled

SFP

5520-48SE

100BASE-FX

1GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Enabled

SFP+

5520-24X

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

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+

SFP28

5520-VIM-4YE

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G SFP+

25G DAC

Enabled

FEC is negotiated requesting CL108.

25G AOC

FEC auto: CL108

25G SFP28

FEC auto: CL108

Table 4. 5720 Series default behavior

Port type

Model

Transceiver type

Auto-Negotiation

FEC

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

5720-24MW

5720-48MW

Enabled

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

5720-24MXW

5720-48MXW

Enabled

QSFP28

5720-24MW

5720-48MW

5720-24MXW

5720-48MXW

40G DAC

Enabled

40G AOC

40G QSFP+

100G DAC

Enabled

FEC is negotiated requesting CL91

100G AOC

FEC auto: CL91

100G QSFP28

FEC auto: CL91

SFP28

5720-VIM-6YE

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 AOC
10G SFP+

25G DAC

Enabled

FEC is negotiated requesting CL108

25G AOC

FEC auto:CL108

25 SFP28

FEC auto:CL108

QSFP28

with QSFP adapter

5720-VIM-2CE

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Disabled

10G AOC

10G SFP+

25G DAC

Enabled

FEC is negotiated requesting CL108

25G AOC

FEC auto:CL108

25G SFP28

FEC auto:CL108

40G DAC

Enabled

40G AOC

40G QSFP+

100G DAC

Enabled

FEC is negotiated requesting CL91

100G AOC

FEC auto:CL91

100G QSFP28

FEC auto:CL91

Table 5. 7520 Series default behavior

Port type

Model

Transceiver type

Auto-Negotiation

FEC

10GBase-T

7520-48XT-6C

Enabled 1G, 10G

SFP28

7520-48Y-8C

1GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Not Supported

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Not Supported

10G SR/AOC

25G DAC

Enabled

Auto-Negotiation

25G SR/AOC

CL108

QSFP28

7520-48XT-6C

7520-48Y-8C

40G DAC

Enabled

40G SR/AOC

100G DAC

Enabled

Auto-Negotiation

100G SR/AOC

CL91

QSFP28

Channelized

7520-48XT-6C

7520-48Y-8C

40G DAC: 4x10G

Enabled

40G SR/AOC: 4x10G

100G DAC: 4x25

Enabled

Auto-Negotiation

100G SR/AOC: 4x25

CL108

QSFP28

with QSFP adapter

7520-48XT-6C

7520-48Y-8C

1G BASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Not Supported

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Not Supported

10G SR/AOC

25G DAC

Enabled

Auto-Negotiation

25G SR/AOC

CL108

Table 6. 7720 Series default behavior

Port type

Model

Transceiver type

Auto-Negotiation

FEC

QSFP28

7720-32C

40G DAC

Enabled

40G SR/AOC

100G DAC

Enabled

Auto-Negotiation

100G SR/AOC

CL91

QSFP28

Channelized

7720-32C

40G DAC: 4x10G

Enabled

40G SR/AOC: 4x10G

100G DAC: 4x25

Enabled

Auto-Negotiation

100G SR/AOC: 4x25

CL108

QSFP28

with QSFP adapter

7720-32C

1G BASE-T

Enabled

The operational state is always enabled regardless of configuration.

1G SFP

Not Supported

10GBASE-T

Enabled

The operational state is always enabled regardless of configuration.

10G DAC

Not Supported

10G SR/AOC

25G DAC

Enabled

Auto-Negotiation

25G SR/AOC

CL108