Planet IGS-801T [73/120] User s manual of igs 801m

Planet IGS-801T [73/120] User s manual of igs 801m
User’s Manual of IGS-801M
LAN 1
Bridge ID = 15
Port 3
Port 1
Port 2
A
Bridge ID = 20
Port 1
Port 2
Port 3
C
Bridge ID = 30
Port 1
Port 2
Port 3
B
LAN 2 LAN 3
Portcast = 19
Portcast = 19 Portcast = 19
Portcast = 19
Portcas
Portcast = 4
Portcast = 4
Portcast = 4
t = 4
ure 4-6-2 Before A Rules
In this example, only the default re used.
Fig Applying the ST
STP values a
LAN 1
Root Bridge
Port 3
Port 1
Port 2
A
Designated Bridge
Port 1
Port 2
Port 3
C
Port 1
Port 2
Port 3
B
LAN 2 LAN 3
Designated Port
Root Port
Root Port
Designated Port
Blocked
The switch with the lowest Bridge ID (switch C) was elected the root bridge, and the ports were selected to give a high port
cost between switches B and C. The two (optional) Gigabit ports (default port cost = 4) on switch A are connected to one
(optional) Gigabit port on both switch B and C. The redundant link between switch B and C is deliberately chosen as a 100
Mbps Fast Ethernet link (default port cost = 19). Gigabit ports could be used, but the port cost should be increased from
the default to ensure that the link between switch B and switch C is the blocked link.
Figure 4-6-3 After Applying the STA Rules
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