HP A3100-8 v2 SI Configuration Manual page 57

Table 10 Initial state of each device
Device
Device A
Device B
Device C
NOTE:
In Table 10, each configuration BPDU contains the following fields: root bridge ID, root path cost,
designated bridge ID, and designated port ID.
Comparison process and result on each device
5.
Table 11 Comparison process and result on each device
Device Comparison process
•
•
Device A
•
•
Device B
•
Port name
Port A1
Port A2
Port B1
Port B2
Port C1
Port C2
Port A1 receives the configuration BPDU of Port B1 {1, 0,
1, Port B1}, finds that its existing configuration BPDU {0,
0, 0, Port A1} is superior to the received configuration
BPDU, and discards the received one.
Port A2 receives the configuration BPDU of Port C1 {2, 0,
2, Port C1}, finds that its existing configuration BPDU {0,
0, 0, Port A2} is superior to the received configuration
BPDU, and discards the received one.
Device A finds that it is both the root bridge and
designated bridge in the configuration BPDUs of all its
ports, and considers itself as the root bridge. It does not
change the configuration BPDU of any port and starts to
periodically send configuration BPDUs.
Port B1 receives the configuration BPDU of Port A1 {0, 0,
0, Port A1}, finds that the received configuration BPDU is
superior to its existing configuration BPDU {1, 0, 1, Port
B1}, and updates its configuration BPDU.
Port B2 receives the configuration BPDU of Port C2 {2, 0,
2, Port C2}, finds that its existing configuration BPDU {1,
0, 1, Port B2} is superior to the received configuration
BPDU, and discards the received one.
50
Configuration BPDU on the port
{0, 0, 0, Port A1}
{0, 0, 0, Port A2}
{1, 0, 1, Port B1}
{1, 0, 1, Port B2}
{2, 0, 2, Port C1}
{2, 0, 2, Port C2}
Configuration BPDU on
ports after comparison
•
Port A1: {0, 0, 0, Port
A1}
•
Port A2: {0, 0, 0, Port
A2}
•
Port B1: {0, 0, 0, Port
A1}
•
Port B2: {1, 0, 1, Port
B2}