By Denise Donohue
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Extra resources for CCNP SWITCH 642 813 Quick Reference
The IST appears as one bridge to a CST area and is MST instance number 0. The original MST Spanning Trees (called M-Trees) are active only in the region; they combine at the edge of the CST area to form one. 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.
To remedy a loop quickly, shut redundant ports and then enable them one at a time. Some switches enable debugging of STP to help in diagnosing problems. The following commands are useful for isolating a bridging loop: show interfaces show spanning tree show bridge show process cpu debug spanning tree show mac address-table aging-time vlan# show spanning-tree vlan vlan# detail Spanning-Tree Best Practices To optimize data flow in the network, design and configure Spanning Tree in the following ways: n Statically configure switches to be the primary and secondary root bridges by setting priority values.
Please see page 112 for more details. [ 39 ] CCNP SWITCH 642-813 Quick Reference CHAPTER 3 by Denise Donohue Spanning Tree RSTP Port Roles RSTP also defines different Spanning Tree roles for ports: n Root port: The best path to the root (same as STP) n Designated port: Same role as with STP n Alternate port: A backup to the root port n Backup port: A backup to the designated port n Disabled port: Not used in the Spanning Tree n Edge port: Connected only to an end user BPDU Differences in RSTP In regular STP, BPDUs are originated by the root and relayed by each switch.