Connect & Configure Cisco Networking Devices: Part 2

Table of Contents

1. Main Menu
2. Part 2: Basic Switch Operation and Configuration
3. 2.1: LAN Switching
4. LAN Switching Continued
5. 2.2: Basic Configuration Commands
6. 2.2.1: Privilege Exec Mode Commands
7. 2.2.1: Global Configuration Mode Commands
8. 2.2.3: Line Mode Commands
9. 2.3: Displaying the contents of the MAC Address Table
10. 2.4: Switch Interfaces
11. Switch Interface Configuration Continued
12. 2.5: Assigning an IP Address & Default Gateway to a 2950 Switch
13. 2.6: Configuring Port Security
14. Video: Basic Switch and Port Security Configuration
15. 2.7: The Spanning Tree Protocol (STP)
16. 2.7.2: STP Port States
17. 2.7.3: STP Configuration
18. Review Questions for Part 2

2.7.3: STP Configuration

From Privilege Exec mode Switch# the following commands can be used:

SHOW SPANNING-TREE

This displays details about the STP state

The Switch has been assigned a priority of 32769 and is the root bridge

SHOW SPANNING-TREE INTERFACE FA 0/7

Lists information about the state of STP on this interface only

 

 

Interface Fa 0/7 is in VLAN 1 and is a 100 Mbps port, therefore it has been assigned a cost of 19 and is in a forwarding state

DEBUG SPANNING-TREE

This command is used to show information messages about STP as they arise

From interface configuration mode: Switch(config-if)# Each interface can be configured with a different cost and bridge priority

SPANNING-TREE COST 5

This will change the default cost to 5

SPANNING-TREE VLAN 1 ROOT PRIORITY

This change the Switch priority in the specified VLAN