STP Flashcards
1
Q
Bridge ID (BID)
A
Combination of a 4-bit bridge priority and a 12-bit system id extension
2
Q
Root bridge
A
Bridge that is the base (root) of the STP tree
3
Q
Port cost
A
STP port cost based on configured speed
4
Q
Bridge priority
A
default = 32768
5
Q
Default port costs
A
10mbps = 100 100mbps = 19 1gbps = 4 10gbps = 2
6
Q
view spanning tree info for a vlan
A
show spanning-tree vlan
show spanning-tree root
7
Q
original spanning tree specification (PVST+)
A
802.1D
8
Q
The spanning-tree algorithm
A
- elect root bridge
- elect root port for each non-root device
- elect a DP for each segment
- ports transition to forwarding to blocking/discarding
9
Q
Portfast
A
Allows an access port to immediately transition to forwarding
10
Q
BPDU Guard
A
Disable a port if a BPDU is received
11
Q
802.1w valid switch states
A
learning
discarding
