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Spanning Tree
Spanning Tree General
18
Computer Networking
Professional
04/24/2016

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Cards

Term
What is the primary goal of Spanning Tree?
Definition
Loop avoidance
Term
By default what type of MAC address is used?
Definition
The lowest and oldest
Term
Original implementation is what IEEE standard?
Definition
802.1d
Term
802.1d takes how long to converge?
Definition
30 to 50 seconds
Term
Switches determine the root based on what value?
Definition
Bridge ID
Term
The Bridge ID consists of what two values?
Definition
Bridge Priority and MAC Address
Term
What is the default Bridge Priority
Definition
32768
Term
In what increments can the Bridge Priority be changed?
Definition
4096
Term
Which Bridge Priority will cause the switch to become the root? Lower or higher?
Definition
Lower
Term
What value ensures the switch becomes the root?
Definition
zero
Term
What type of packet is used between switches for Spanning Tree communication?
Definition
Bridge Protocol Data Units (BPDU)
Term
What type of BPDU is for normal Spanning Tree computation?
Definition
Configuration BPDU
Term
What type of BPDU is sent by a new switch to notify all switches that it has connected?
Definition
BPDU with the Topology Change Notification TCN bit set
Term
When a switch joins the network it begins sending BPDU's claiming to be what?
Definition
The Root Bridge
Term
When a switch receives a superior BPDU it stops sending it's own and forwards the superior. What ST states does this involve?
Definition
Listening and Learning
Term
When only one switch is sending BPDUs and the others begin the process of finding the best path to the root. What state is this?
Definition
Forwarding
Term
When a topology change occurs the root switch sets what flag in it's BPDU's prior to forwarding to all other switches?
Definition
The TC bit
Term
When a BPDU comes out with a TC bit flag set what do the receiving switches do?
Definition
Switches age out their forwarding table entries and spanning tree is recalculated.
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