From Teknologisk videncenter
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| | |[[Image:ScreenShot163.jpg|800px|left|thumb|BPDU Process Step 9]] | | |[[Image:ScreenShot163.jpg|800px|left|thumb|BPDU Process Step 9]] |
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| | + | ===Bridge ID=== |
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| | + | |[[Image:ScreenShot164.jpg|800px|left|thumb|BID Fields]] |
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| | + | |[[Image:ScreenShot165.jpg|800px|left|thumb|Priority-based desicions]] |
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| | + | |[[Image:ScreenShot166.jpg|800px|left|thumb|MAC Address-based desicions]] |
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| | + | |[[Image:ScreenShot167.jpg|800px|left|thumb|Configure STP]] |
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| | + | |[[Image:ScreenShot168.jpg|800px|left|thumb|Verify STP]] |
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| | + | ===Port Roles=== |
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| | + | |[[Image:ScreenShot169.jpg|800px|left|thumb|STP Port Roles]] |
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| | + | |[[Image:ScreenShot170.jpg|800px|left|thumb|STP Port Roles]] |
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| | + | |[[Image:ScreenShot171.jpg|800px|left|thumb|Configure port priority]] |
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| | + | |[[Image:ScreenShot172.jpg|800px|left|thumb|Verify Port Roles and Priority]] |
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| | + | ===STP Port States and BPDU Timers=== |
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| | + | |[[Image:ScreenShot173.jpg|800px|left|thumb|STP Port States]] |
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| | + | |[[Image:ScreenShot174.jpg|800px|left|thumb|BPDU Timers]] |
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| | + | |[[Image:ScreenShot175.jpg|800px|left|thumb|BPDU Roles and Timers]] |
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| | + | |[[Image:ScreenShot176.jpg|800px|left|thumb|Configure network diameter]] |
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| | + | |[[Image:ScreenShot177.jpg|800px|left|thumb|Cisco Portfast technology]] |
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| | + | |[[Image:ScreenShot178.jpg|800px|left|thumb|Configure portfast]] |
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| | + | |[[Image:ScreenShot179.jpg|800px|left|thumb|Verify portfast]] |
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Revision as of 15:17, 24 August 2010
STP
Redundant Layer 2 Topologies
Redundancy
 Simple network VLAN mangement |
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 Path Failure - Access to Distribution |
 Path Failure - Distribution to Core |
 Switch Failure - Distribution layer |
 Switch Failure - Core layer |
Issues with Redundancy
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Real-world Redundancy Issues
 Non-Redundant network topology |
 Loops from 2 connections in the same switch |
 Loops from connections to a second switch |
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Introduction to STP
The Spanning Tree Algorithm
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Root ports - Switch ports closest to the root bridge.
Designated ports - All non-root ports that are still permitted to forward traffic on the network.
Non-designated ports - All ports configured to be in a blocking state to prevent loops.
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 Verify port and path costs |
STP BPDU
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Version - The version field indicates the version of the protocol, This field contains the value zero.
Message type - The message type field indicated the type of message, this field contains the value zero.
Flags - The flags field includes one of the following: Topology change(TC) bit, which signals a topology change in the event a path to the root bridge has been disrupted. Topology change acknowledgment(TCA) bit, which is set to acknowledge receipt of a configuration messege with the TC bit set.
Root ID - The Root ID field indicates the root bridge by listing its 2-byte prority followed by its 6-byte MAC address ID.
Bridge ID - The Bridge ID field indicates the priority and MAC address ID of the bridge sending the message
Port ID - The Port ID field indicates the port number from which the configuration message was sent.
Forward Delay - The Forward delay field indicates the length of time that bridges should wait before transitioning to a new state after topology change.
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Bridge ID
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 MAC Address-based desicions |
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Port Roles
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 Verify Port Roles and Priority |
STP Port States and BPDU Timers
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 Configure network diameter |
 Cisco Portfast technology |
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