Red Hat Fedora 5 Unleashed

The Foundation Summary is a collection of information that provides a convenient review of many key concepts in this chapter. If you are already comfortable with the topics in this chapter, this summary can help you recall a few details. If you just read this chapter, this review should help solidify some key facts. If you are doing your final preparation before the exam, this information is a convenient way to review the day before the exam.

RSTP port roles:

  • Root port

  • Designated port

  • Alternate port

  • Backup port

RSTP port states:

  • Discarding

  • Learning

  • Forwarding

Table 12-3. RSTP Configuration Commands

Task

Command Syntax

Define an edge port

Switch(config-if)# spanning-tree portfast

Override a port type

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Switch(config-if)# spanning-tree link-type point-to-point

STP instances involved with MST:

  • Common Spanning Tree (CST) Used to maintain a single loop-free topology for the entire network

  • Internal Spanning Tree (IST) Used like CST, to maintain a single, loop-free topology inside an MST region

  • MST instances (MSTIs) Used inside an MST region to maintain loop-free topologies for sets of mapped VLANs

Table 12-4. MST Region Configuration Commands

Task

Command Syntax

Enable MST on a switch

Switch(config)# spanning-tree mode mst

Enter MST configuration mode

Switch(config)# spanning-tree mst configuration

Name the MST region

Switch(config-mst)# name name

Set the configuration revision number

Switch(config-mst)# revision version

Map VLANs to an MST instance

Switch(config-mst)# instance instance-id vlan vlan-list

Confirm new MST configuration changes

Switch(config-mst)# show pending

Commit new MST changes

Switch(config-mst)# exit

Table 12-5. MST Tuning Configuration Commands

Task

Command Syntax

Set the Root Bridge

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Switch(config)# spanning-tree mst instance-id root {primary | secondary} [diameter diameter]

Set bridge priority

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Switch(config)# spanning-tree mst instance-id priority bridge- priority

Set port cost

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Switch(config)# spanning-tree mst instance-id cost cost

Set port priority

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Switch(config)# spanning-tree mst instance-id port-priority port-priority

Set STP timers

Switch(config)# spanning-tree mst hello-time seconds Switch(config)# spanning-tree mst forward-time seconds Switch(config)# spanning-tree mst max-age seconds

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