100BASE-T Autonegotiation

100BASE-T Autonegotiation

The following is the command that configures a switch to autonegotiate a port:

set port speed <mod/port> auto

In Figure 1-9, Host1 has a 10BASE-T card. The switch has a capability to operate in both 10BASE-T and 100BASE-T mode. The 10/100 modules are common in a switching environment. Cisco has various 10/100 modules with various features and functionalities. In this example, there is a mismatch between the pulses sent by the Host1 and the switch. Because Host1 has a 10BASE-T card, it can send only NLPs. Initially, when the switch comes online, it generates only FLP bursts. When the switch detects NLPs from its link partner, it ceases to generate FLP bursts and switches to NLP. Depending on the static configuration on Host1, the switch chooses that priority. In this instance, the connection is 10BASE-T operating at half duplex.