Spanning Tree Part 1

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S
T
P
1
PANNING
REE
ART
packetlife.net
Spanning Tree Protocols
Legacy STP
PVST
PVST+
RSTP
RPVST+
MST
Algorithm
Legacy ST
Legacy ST
Legacy ST
Rapid ST
Rapid ST
Rapid ST
802.1w,
802.1s,
Defined By
802.1D-1998
Cisco
Cisco
Cisco
802.1D-2004
802.1Q-2003
Instances
1
Per VLAN
Per VLAN
1
Per VLAN
Configurable
Trunking
N/A
ISL
802.1Q, ISL
N/A
802.1Q, ISL
802.1Q, ISL
Spanning Tree Instance Comparison
STP
PVST+
MST
Root
VLAN 1,10 Root
VLAN 20,30 Root
MSTI 0 Root
MSTI 1 Root
A
B
A
B
A
B
All VLANs
VLAN 1
MSTI 0 (1, 10)
VLAN 10
MSTI 1 (20, 30)
x
x x x x
x
x
VLAN 20
VLAN 30
C
C
C
BPDU Format
Spanning Tree Specifications
Link Costs
Field
Bits
Bandwidth
Cost
802.1s
802.1Q-2003
802.1Q-2005
Protocol ID
16
4 Mbps
250
Version
8
10 Mbps
100
802.1D-1998
802.1D-2004
BPDU Type
8
16 Mbps
62
Flags
8
45 Mbps
39
802.1Q-1998
802.1w
Root ID
64
100 Mbps
19
Root Path Cost
32
155 Mbps
14
ISL
PVST
PVST+
RPVST+
Bridge ID
64
622 Mbps
6
Port ID
16
1 Gbps
4
IEEE 802.1D-1998
Deprecated legacy STP standard
Message Age
16
10 Gbps
2
IEEE 802.1w
Introduced RSTP
Max Age
16
20+ Gbps
1
IEEE 802.1D-2004
Replaced legacy STP with RSTP
Hello Time
16
IEEE 802.1s
Introduced MST
Port States
Forward Delay
16
Legacy ST
Rapid ST
IEEE 802.1Q-2003
Added MST to 802.1Q
Disabled
Default Timers
IEEE 802.1Q-2005
Most recent 802.1Q revision
Blocking
Discarding
Hello
2s
PVST
Per-VLAN implementation of legacy STP
Listening
Forward Delay
15s
PVST+
Added 802.1Q trunking to PVST
Learning
Learning
Max Age
20s
RPVST+
Per-VLAN implementation of RSTP
Forwarding
Forwarding
Spanning Tree Operation
Port Roles
Determine root bridge
1
The bridge advertising the lowest bridge ID becomes the root bridge
Legacy ST
Rapid ST
Select root port
Root
Root
2
Each bridge selects its primary port facing the root
Designated
Designated
Select designated ports
3
Alternate
One designated port is selected per segment
Blocking
Block ports with loops
Backup
4
All non-root and non-desginated ports are blocked
by Jeremy Stretch
v3.0

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