Auto-Negotiation

Table 1. Auto-Negotiation product support
Feature	Product	Release introduced
Auto-Negotiation	5420 Series	VOSS 8.4 Switch models: 5420F-24T-4XE, 5420F-24P-4XE, 5420F-48T-4XE, 5420F-48P-4XE, 5420F-48P-4XL, 5420F-24S-4XE , 5420F-8W-16P-4XE, 5420F-16W-32P-4XE, 5420F-16MW-32P-4XE, 5420M-24W-4YE, 5420M-48W-4YE, 5420M-24T-4YE, 5420M-48T-4YE, 5420M-16MW-32P-4YE Note: SFP-DD ports are only available if you disable Advanced Feature Bandwidth Reservation.
	5520 Series	VOSS 8.2.5 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
	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 devices to switch between the various operational modes in an ordered fashion and enables you to 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).