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Spanning Tree (IEE 802.1D (STP) (Hello BPDU (Timer values from root (hello…
Spanning Tree
IEE 802.1D (STP)
Switch roles
Root bridge
Port Roles
All interfaces are Designated Ports (DP)
Nonroot
Port Roles
Root port (RP)
Port with the least cost to reach root
Lowest
neighbor
BID
Lowest
neighbor
port priority
Lowest
neighbor
interface number
Designated port
Lowest root cost
Lowest BID
Lowest BID MAC
Lowest interface STP priority
1 more item...
Hello BPDU
Root bridge ID
Sender's bridge ID
Sender's root cost
Timer values from root
hello timer
2 sec
max age timer
20 sec (10 times hello)
forward delay
15 sec
Port states
Stable
Forwarding
Blocking
Disabled
Transitory
Listening
Learning
Convergance
50 sec w/ default timers
Port Costs
100
10 Mbps
19
100 Mbps
2
10 Gbps
4
1 Gbps
802.1w (RSTP)
Port States
Stable
Disabled
Forwarding
Discarding
Transitory
Learning
Convergance
10 sec
Timers
Max age timer
3 times hello
Port Roles
Root port
Designated port
Alternate
RP replacement
Backup
DP replacement
Port Types
Point-to-point
Connects to another switch
Edge
Connectes to an end device
Shared
Connectes to a hub
Prevents
Broadcast storms
MAC table instability
Multiple frame transmission
Root bridge election
Bridge ID (BID)
8-byte
2-byte priority
increments of 4096
default 32769
6-byte system ID
Based on MAC
Lowest BID priority
Lowest BID MAC