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Note The STP toolkit also supports the BPDU filter option, which prevents PortFast-enabled ports from sending or receiving BPDUs. This feature effectively disables STP at the edge and can lead to STP loops. It is not recommended. STP Standards and Features STP enables the network to deterministically block interfaces and provide a loop-free topology in a network with redundant links. 1D-1998) that provides a loop-free topology in a network with redundant links. Common Spanning Tree (CST) assumes one spanning-tree instance for the entire bridged network, regardless of the number of VLANs.

Using tools to analyze network traffic c. Using design tools to create a framework for the design d. Using tools for automated auditing of the network e. Identifying the business objectives of the organization Chapter 2. Enterprise Campus Network Design After completing this chapter, you will be able to • Design enterprise campus network infrastructures • Review high-availability campus design features and make recommendations • Describe Layer 2 campus design options and make recommendations • Describe Layer 3 campus design options and make recommendations • Discuss options for Layer 2 to Layer 3 boundary placement in the campus • Describe infrastructure service considerations, including IP telephony, QoS, and Cisco Catalyst Integrated Security features The complexity inherent in today's campus networks necessitates a design process capable of separating solutions into basic elements.

If a link to an access layer device goes down, return traffic at the distribution layer to that device is dropped until the IGP converges. When summarization is used and the distribution nodes send summarized information toward the core, an individual distribution node does not advertise loss of connectivity to a single VLAN or subnet. This means that the core does not know that it cannot send traffic to the distribution switch where the access link has failed. Summaries limit the number of peers that an EIGRP router must query or the number of link-state advertisements (LSA) that OSPF must process, and thereby speeds the rerouting process.

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