Specifications

Spanning Tree Operation
9-6 Ethernet Bridge Operation
Spanning Tree Operation
In the following explanation we take Spanning Tree through the network
shown in Figure 9-2, which consists of two-port bridges. You must
understand that the Spanning Tree process is a single operation,
combining both root bridge determination and data loop detection and
resolution. For the purpose of explanation, we split the process into two
individual discussions:
• Root Bridge determination
• Data Loop detection and resolution
Also, to clarify our referencing, the bridges are named as shown:
Figure 9-2. Network Before Spanning Tree
The Bridge Parameters for the network above are:
Bridge Bridge ID Path Cost
SAM 80-00-00-00-1d-23-56-a2 100
ANN 80-00-00-00-1d-56-d4-f4 100
JANET 80-00-00-00-1d-f4-67-2a 100
EVENIN 80-00-00-00-1d-4f-94-a1 100
LAN A
LAN B
LAN C
ANN JANET
SAM
EVENIN
1913-32