Configure the Interface Speed

By default, the router's management Ethernet interface, fxp0, autonegotiates whether to operate at 10 Mbps or 100 Mbps. All other interfaces automatically choose the correct speed based on the PIC type and whether the PIC is configured to operate in multiplexed mode (using the no-concatenate statement in the [edit chassis] configuration hierarchy, as described in the JUNOS Internet Software Guide: Getting Started).

To configure the management Ethernet interface to operate at 10 Mbps or 100 Mbps, include the speed statement at the [edit interfaces fxp0] hierarchy level:

[edit interfaces fxp0]

speed (10m | 100m);