LevelOne ProCon GSW-1290, Руководство пользователя

Страница: 64 / 144

LevelOne GSW-1290 Gigabit Layer2 SNMP Switch
The following fields can be set for STP port configuration:
Parameter Description
Unit This is the Unit ID of a Switch in a Switch stack. The number 15 indicates
a GSW-1290 Switch in standalone mode.
From/To A consecutive group of ports may be configured starting with the selected
port.
State This drop-down menu allows you to enable or disable STP for the
selected group of ports.
Cost A Port Cost can be set from 1 to 200000000. The lower the number, the
greater the probability the port will be chosen to forward packets.
Default port cost:
100Mbps port = 200000
Gigabit ports = 20000
Priority
A Port Priority can be from 0 to 240. The lower the number, the greater
the probability the port will be chosen as the Root Port.
Migration Select Yes or No. Choosing Yes will enable the port to migrate from
802.1d STP status to 802.1w RSTP status. RSTP can coexist with
standard STP, however the benefits of RSTP are not realized on a port
where an 802.1d network connects to an 802.1w enabled network.
Migration should be enabled (Yes) on ports connected to network stations
or segments that will be upgraded to 802.1w RSTP on all or some portion
of the segment.
Edge Select Yes or No. Choosing Yes designates the port as an edge port.
Edge ports cannot create loops, however an edge port can lose edge port
status if a topology change creates a potential for a loop. An edge port
normally should not receive BPDU packets. If a BPDU packet is received
it automatically loses edge port status. No indicates the port does not
have edge port status.
P2P Select Yes or No. Choosing Yes indicates a point-to-point (p2p) shared
link. These are similar to edge ports however they are restricted in that a
p2p port must operate in full duplex. Like edge ports, p2p ports transition
to a forwarding state rapidly thus benefiting from RSTP.
64