Allied Telesis AT-S26 - Manual (Page 149)

AT-S26 Version 2.0.1 User’s Guide
149
Remapping Network Topology
If there is a change in the network topology due to a failure, removal,
or addition of any active components, the active topology also
changes. This may trigger a change in the state of some blocked
ports.
The blocked ports do not forward packets immediately. They first
pass through two states, listening and learning, to verify that they
may begin forwarding. A port remains in each of these two states for
the time defined by the Forwarding Delay parameter. This algorithm
ensures that no temporary loops exist in the active network topology
and is a safeguard against packet forwarding during a network
topology change period.