200 301 training

200 301 training. spanning-tree portfast bpduguard defaultTo override the default settings and disable these features, you can use the following interface subcommands. spanning-treePortfastdisable spanning-treebpduguarddisableConfiguring an Ethernet ChannelAs described in Chapter 1 of this book, two adjacent switches can treat multiple parallel links between them as a single logical link, which is called an EtherChannel.STPs perform their associated operations on the Ethernet channel, rather than on separate physical links, so that for a given VLAN, STPs can forward or block on the entire logical Ethernet channel. Therefore, a switch in the forwarding state can perform load balancing operations on the Ethernet channel for all physical links for traffic. Without an Ethernet channel, only one parallel link located between two switches can forward traffic, while all other links are blocked by STP.The Ethernet channel is perhaps one of the most challenging switch features to use. First, there are several options in the configuration, and you must remember the details of how each option works with each other. Second, the switch also requires various other interface settings to match all the links in the channel, so you must also have an understanding of these settings.In this section, we focus on proper Ethernet channel configuration. Later, in the section titled "Troubleshooting Ethernet Channels," many potential problems with Ethernet channels are covered, including other configuration settings that the switch needs to check before enabling Ethernet channels.36 Chapter 2 Configuring the Spanning Tree Protocol (STP )Configuring a Manual Ethernet ChannelThe easiest way to configure Ethernet channels is to use the correct channel- for each physical interface on each switch