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physical loop in the network and which ports break which
loops is extremely helpful.
Minimize the number of ports in the blocking state.
A single blocking port transitioning to the forwarding state at
an inappropriate time can cause a large part of a network to
fail. Limiting the number of blocked ports help to limit the
risk of an inappropriate transition.
Figure A-4. STP Network Layout
This is a common network design. The switches C and D
have redundant links to the backbone switches A and B
using trunks. Trunks, by default, carry all the VLAN traffic
from VLAN 1 and VLAN 2. So switch C is not only receiving
traffic for VLAN 1, but it is also receiving unnecessary
broadcast and multicast traffic for VLAN 2. It is also blocking
one port for VLAN 2. Thus, there are three redundant paths
184 VH-2402-L3 Management Guide
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