Specifications

CHAPTER 3
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.
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CCNP SWITCH 642-813 Quick Reference by Denise Donohue
FIGURE 3-3
Example Switched
To p o l o g y
Root Bridge
UDLD
UDLD
UDLD
UDLD,
LoopGuard
RootGuard,
UDLD
RootGuard,
UDLD
UDLD
UDLD,
LoopGuard
BackboneFast,
BPDU Filter
PortFast,
BPDU Guard
Forwarding
Blocking
UplinkFast