New PDF release: CCNP SWITCH 642 813 Quick Reference

By Denise Donohue

As a last examination practise device, the CCNP swap quickly Reference provides a concise evaluation of all goals at the new CCNP swap examination (642-813). This publication offers you particular, graphical-based details, highlighting simply the major subject matters in cram-style layout.


With this rfile as your advisor, you are going to assessment themes on campus community layout, complex spanning tree, digital LANs (VLAN) and inter-VLAN routing, excessive availability, instant LANs, voice and video, and campus community protection. This fact-filled speedy Reference enables you to get all-important details at a look, aiding you to concentration your examine on parts of weak spot and to reinforce reminiscence retention of crucial examination concepts.

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44 ] CCNP SWITCH 642-813 Quick Reference CHAPTER 3 by Denise Donohue Spanning Tree Root Guard Root Guard is meant to prevent the wrong switch from becoming the Spanning Tree root. It is enabled on ports other than the root port and on switches other than the root. If a Root Guard port receives a BPDU that might cause it to become a root port, the port is put into “root-inconsistent” state and does not pass traffic through it. If the port stops receiving these BPDUs, it automatically reenables itself.

Please see page 112 for more details. [ 48 ] CCNP SWITCH 642-813 Quick Reference CHAPTER 3 by Denise Donohue Spanning Tree n Tune STP using the tools detailed in this section. n Enable UDLD aggressive mode on all fiber interfaces. n Design STP domains that are as simple and contained as possible by using multilayer switches and routed links. n Use PVRST+ or MST for the fastest convergence times. Confused by all the acronyms and STP features? Figure 3-3 shows the STP tools you might use in your network and where you might use them.

Spanning Tree Stability Mechanisms Spanning Tree has several additional tools for tuning STP to protect the network and keep it operating properly. They include: n PortFast (discussed previously) n UplinkFast n BackboneFast n BPDU Guard n BPDU Filtering n Root Guard n UDLD n Loop Guard © 2010 Pearson Education, Inc. All rights reserved. This publication is protected by copyright. Please see page 112 for more details. [ 42 ] CCNP SWITCH 642-813 Quick Reference CHAPTER 3 by Denise Donohue Spanning Tree UplinkFast UplinkFast is for speeding convergence when a direct link to an upstream switch fails.

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CCNP SWITCH 642 813 Quick Reference by Denise Donohue

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