IBM 8271 Nways Ethernet LAN Switch, Руководство пользователя

Страница: 127 / 210

How STP Works 6-5
2 After all the bridges on the network have determined the configuration
of their ports, each bridge only forwards traffic between the Root Port
and the ports that are the Designated Bridge Ports for each network
segment. All other ports are
blocked , which means that they are
prevented from forwarding traffic.
STP Reconfiguration In the event of a network failure, such as a segment going down, the
STP system reconfigures the network to cater for the changes. If the
topology of your network changes, the first bridge to detect the
change
sends out an SNMP trap.
An Example Figure 6-4 illustrates part of a network. All bridges have a path cost
value assigned to each port, identified by PC=
xxx (where xxx is the
value).
Figure 6-4 Port costs in a network
F24user.bk Page 5 Wednesday, July 15, 1998 4:27 PM