Physical Link Parameters¶

Unlike the MAC and MTU parameters which are applicable to all Ethernet interfaces, the following settings are only applicable to physical interfaces (i.e., interfaces backed by a physical PCI port).

Auto-Negotiation¶

Even though it is often left enabled, auto-negotiation may be changed to cope with certain physical connections.

vsr running config# / vrf main interface physical eth1 ethernet auto-negotiate false

Duplex Mode¶

By default, this setting is negotiated automatically with the connected endpoint. When auto-negotiation is set to false, you must specify the duplex mode of the connection.

vsr running config# / vrf main interface physical eth1 ethernet duplex-mode full

Port Speed¶

By default, this setting is negotiated automatically with the connected endpoint. When auto-negotiation is set to false, you must specify the port speed.

vsr running config# / vrf main interface physical eth1 ethernet port-speed 10gb

Flow Control¶

Pause frames are used by the NIC to ask a peer to slow down. It can be configured to automatically send pause frames as soon as the receive buffer is getting low, and to accept or not pause frames from other devices.

The default settings vary with hardware and device drivers. You may force them with the following commands:

vsr running config# / vrf main interface physical eth1 ethernet flow-control-tx false
vsr running config# / vrf main interface physical eth1 ethernet flow-control-rx false