Auto-Negotiation

Table 1. Auto-Negotiation product support

Feature

Product

Release introduced

Auto-Negotiation

5320 Series

Fabric Engine 8.6

5420 Series

VOSS 8.4

Note:

SFP-DD ports are only available if you disable Advanced Feature Bandwidth Reservation.

5520 Series

VOSS 8.2.5

Only on the following switch models:

5520-24T

5520-24W

5520-48T

5520-48W

5520-12MW-36W

5520-48SE QSFP28/QSFP+ ports, and all fixed fiber ports, at 1 Gbps only

Note:

QSFP28 ports are only available if you disable Advanced Feature Bandwidth Reservation.

5520-VIM-4XE at 1 Gbps only and 5520-VIM-4YE at 25 Gbps only

5720 Series

Fabric Engine 8.7

7520 Series

Fabric Engine 8.10

7720 Series

Fabric Engine 8.10

VSP 4450 Series

VSP 4000 4.0

VSP 4900 Series

VOSS 8.1

Switch models:

  • VSP4900-24S and VSP4900-48P - all fixed ports

  • VSP4900-12MXU-12XE - all fixed ports, with ports 13 to 24 at 1 Gbps only

  • VSP4900-24XE - all fixed ports at 1 Gbps only

VIM5-4XE at 1 Gbps only and VIM5-4YE at 25 Gbps only

VSP 7200 Series

VOSS 4.2.1

VSP 7400 Series

VOSS 8.0

VSP 8200 Series

VSP 8200 4.0

VSP 8400 Series

VOSS 4.2

VSP 8600 Series

VSP 8600 4.5

XA1400 Series

VOSS 8.0.50

The Auto-Negotiation feature enables the device to switch between the various operational modes in an ordered fashion and lets you select a specific operational mode. The Auto-Negotiation feature also provides a parallel detection (called autosensing) function to recognize compatible devices, even if they do not support Auto-Negotiation and helps the device sense the link speed only; not the duplex mode.

You can use the show interfaces gigabitEthernet l1-config command to see the Auto-Negotiation operational state on a port. The operational state uses the configuration and transceiver type present in the port. If you enable Auto-Negotiation for the port but the transceiver type does not support Auto-Negotiation, the operational state is disabled (false).

Important

Important

The software requires the same Auto-Negotiation configuration on link partners to avoid incorrect declaration of link status. Mismatched configuration can cause the links to stay down as well as unpredictable behavior. Ensure the Auto-Negotiation configuration between local ports and their remote link partners match before upgrading software releases.