On EX4550-32T, 100m speed is supported with both auto-negotiation enabled and disabled. This article provides a sample configuration to achieve this requirement.

There are two methods to set 100m speed on EX4550-32T.

1. If peer device supports auto-negotiation, use the following configuration:
   

   root # set interfaces <xe-x/y/z> ether-options auto-negotiation
   root # set interfaces <xe-x/y/z> ether-options link-mode full-duplex
   root # set interfaces <xe-x/y/z> ether-options speed 100m

   This configuration will force EX4550 to negotiate with the peer device with fixed speed 100m. In case auto-negotiation failed with peer device, interface would not be UP.

• If the peer device does not support auto-negotiation, use the following configuration:
  

  root # set interfaces <xe-x/y/z> ether-options no-auto-negotiation
  root # set interfaces <xe-x/y/z> ether-options link-mode full-duplex
  root # set interfaces <xe-x/y/z> ether-options speed 100m
  root # set interfaces <xe-x/y/z> ether-options mdi-mode <mdix or mdi>

  This configuration will force EX4550 to work with the fixed speed 100m without negotiation with the peer device. At that time, enable mdi-mode along with cable type and mdi-mode on the peer device.