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200 301 weston street winnipeg.38 Chapter 2 Configuring Spanning Tree Protocol (STP ) less than one party2.2 Base Content 39must use desirable, while for LACP, at least one of the two parties must use active o Tip: Do not use the on parameter on only one end and use aut. or desirable (or active or passive for LACP) on the adjacent switch. o The on option does not use either PAgP, or LACP, so for configurations that use on, if the other end is a PAgP or LACP option, then it will cause the Ethernet channel to not work properly.For example, you can replace the configuration of both interfaces in Example 2.7 with channel-group 1 mode desirable, and use channel-group 2 mode autoo for SW2Use PAgP channel-group 1 mode desirableFaO/15FaO/17 channel-group2mode {desirable| auto) FaO/14 FaO/16 start negotiation channel-group1modeactive channel-group2mode {active| passive) using LACP Figure 2-7 Correct Ethernet Channel Configuration CombinationsTroubleshooting STPThe last part of this chapter deals with how to apply the information provided in Chapter 1 of this book and in the first half of this chapter. Although this section can help prepare you for solving STP problems in real networks, the main purpose of this section is to answer STP questions that you may encounter on the CCNA exam.Questions about STP can be daunting to many test takers; STP uses many rules, and if one rule does not solve the problem, another rule can. For those with little experience using STP, they have no idea what their answer will be. In addition, even those of us who are already working with networks don't always troubleshoot STP. This is because STP runs by default, and for medium and small networks, you can get better results using the default settings, so administrators rarely troubleshoot STP. It is also because of this that every effort should be made to obtain a better STP troubleshooting strategy before testing complex STP issues.