VSP transceivers and autonegotiation


Use Autonegotiation to allow the device to automatically negotiate the best common data rate and duplex mode to use between two Autonegotiation-capable Ethernet devices.

When you use a 1 Gigabit SFP transceiver on a 10 Gigabit SFP+ port, you must enable autonegotiate if it is not enabled already. However, if you use 1 Gigabit SFP transceivers on a VSP 4000 switch that is connected to third party switches at the remote end, you must have autonegotiate enabled at all times; this applies to SFP transceivers installed in a 1 Gigabit SFP port or a 10 Gigabit SFP+ port.

For VSP 7254XSQ, auto-negotiation is always disabled for 1 Gigabit Ethernet transceivers. If using a 1000BASE-T SFP, the remote 1000BASE-T interface must have auto-negotiation enabled. If not, the link will not be established. Also note that because the SFP+ ports on the VSP 7254XSQ only support 1 and 10 Gbps speeds, the AA1419043-E6 1000BASE-T SFP will only operate at 1G speeds.

If you use 1 Gbps fiber SFP transceivers, auto-negotiation is always disabled so the remote end must also have auto-negotiation disabled. Otherwise this is not a supported configuration with VSP 7254XSQ.

Connecting VSP 7254XSQ with 1 Gbps fiber SFP to EXOS switches will require autonegotiation to be disabled on EXOS switch.

configure port <port#> auto off speed < speed > duplex <half | full>

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