Waters Network Systems
User’s Manual
Page 77
GSM-2116 and GSM-2124
compatible with STP (802.1d).
Figure 5.47 – STP Configuration
5.19.3 STP Port Configuration
Function name:
STP Port Setting
Function description:
In the STP Port Setting, one item selection and five
parameters are available for setup. You can
disable and enable each port. You can set “Path Cost” and “Priority” for each port and set “Admin
Edge Port” and “Admin Point To Point”.
Parameter description:
Port Status:
Displays the current state of a port for viewing only. There are three possible states. ( according
to 802.1w specification)
DISCARDING state indicates that this port can neither forward packets nor contribute
learning knowledge.
LEARNING state indicates this port can now contribute its learning knowledge but cannot forward
packets.
FORWARDING state indicates this port can both contribute its learning knowledge and forward
packets normally.
Note
: Three other states (Disable state, BLOCKING state and LISTENING state) defined in the
802.1d specification are now represented as DISCARDING state.
Path Cost Status:
The contribution value of the path through this port to 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.
