User`s manual

Signamax 065-1600 series Managed Media Converter
Publication date: October, 2005
Revision 1.0
61
Function name:
Port Setting
Function description:
In the STP Port Setting, one item selection and five parameters settings are
offered for user’s setup. User can disable and enable each port by selecting
each Port Status item. User also can set “Path Cost” and “Priority” of each port
by filling in the desired value and set “Admin Edge Port” and “Admin Point To
Point” by selecting the desired item.
Parameter description:
Port Status:
It displays the current state of a port. We cannot manually set it because
it displays the status only. There are three possible states (according to
the 802.1w specification):
 DISCARDING state indicates that this port can neither forward packets
nor contribute learning knowledge.
Notice: Three other states (Disable state, BLOCKING state and LISTENING
state) defined in the 802.1d specification are now all represented as
DISCARDING state.
 LEARNING state indicates this port can now contribute its learning
knowledge but cannot forward packets still.
 FORWARDING state indicates this port can both contribute its learning
knowledge and forward packets normally.
Path Costs:
The contribution value of the path through this port to the Root Bridge.
STP algorithm determines a best path to Root Bridge by calculating the
sum of path cost contributed by all ports on this path. A port with a
smaller path cost value would become the Root Port more possibly. The
range is 0 – 200,000,000. In the Signamax 065-1600 series, a path cost
with a 0 value means "automatic", this will automatically assign the path
cost value defined by IEEE 802.1w. Default: 0
802.1w RSTP recommended value: (Valid range: 1 – 200,000,000)
10 Mbps : 2,000,000
100 Mbps : 200,000
1 Gbps : 20,000
Priority:
Priority here means Port Priority. Port Priority and Port Number are
mixed to form the Port ID. Port IDs are often compared in order to
determine which port of a bridge would become the Root Port. The range