STP concepts Flashcards
STP states
blocking forwarding
STP transition states in order
listening learning
broadcast storms lead to
mac table instability
mulitple copies of frames arriving
root port
port that has the lowest administrative cost from root switch
deisgnated port
port on the designated switch that is lowest cost to a separate part of the LAN
parts of a Hello BPDU
root BID
Sender BID
Sender cost
Root timer values
How is root decided
Lowest numeric BID value
STP TImers
Hello, Maxage and forward delay
default hello timer
2 seconds
what is maxage timer
10 times hello max time a switch waits before trying to change network topology
what is forward delay
the time each transition state goes through when going from blocking to forwarding
what happens after maxage expiry
new root election is held, root ports adjusted
what happens during listening
removes old mac entries
what happens during learning
learn new macs from frames received
What does rstp allow for
changing root port without waiting and dp
