Atop EH75 series, User Manual, Page: 99 / 191

Industrial Managed
Ethernet Switch
User Manual
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Table 2.36 Descriptions of Spanning Tree Port Setting
Label Description Factory
Default
Instance ID Choose from dropdown list of CIST (Common and Internal
Spanning Tree) or choose value from 1 to 63 CIST
Port The name of the switch port
-
State State of the port:
‘
Disc
’:
Discarding
–
No user data is sent over the port
.
‘
Lrn
’:
Learning
–
The port is not forwarding frames yet, but it is
populating its MAC Address Table
.
‘
Fwd
’:
Forwarding
–
The port is fully operational
.
N
/
A
Role Non
-
STP or STP
RSTP bridge port roles
:
‘
Root
’ –
A forwarding port that is the best port from non
-
root
bridge to root bridge
.
‘
Designated
’ –
A forwarding port for every LAN segment
.
‘
Alternate
’ –
An alternate path to the root bridge
.
This path is
different from using the root port
.
‘
Backup
’ –
A backup/redundant path to a segment whose
another bridge port already connects
.
‘
Disabled
’ –
Note strictly part of STP, a network administrator
can manually disable a port
.
Non
-
STP
Setting the path cost for each switch port
Path Cost
Config
Setting path cost
)
default
:
0, meaning that using the system
default value
)
depending on link speed
((
0
Actual The actual value path cost
)
For STP and RSTP, please see Note
1 below and Table 2.37
.(
0
Pri Setting the port priority, used in the Port ID field of BPDU packet,
value
=
16 × N,
)
N
:
0~15
(
See Note 2 below
.
128
The connection between two or more switches
)
for RSTP
(
Link Type
Config Setting of the Link Type
P2P
:
A port that operates in full
-
duplex mode is assumed to be
point
-
to
-
pint link
.
Non
-
P2P
:
A half
-
duplex port
)
through a hub
(
Auto
:
Detect link type automatically
Auto
P2P? Yes
:
This port is a Point
-
to
-
Point
)
P2P
(.
No
:
This port is not Point
-
to
-
Point
)
Non
-
P2P
(.
No
Edge port is a port which no other STP
/
RSTP switch connect to
)
for RSTP
(.
An edge port can be set to forwarding state directly
.
Edge
Config Edge functional is set
:
Yes or No
No
Edge? Yes
:
This port is an edge port
.
No
:
This port is not an edge port
.
No
BPDU Guard
Check the box to enable BPDU (Bridge Protocol Data Unit)
guard Unchecked
This shows some information of the best BPDU packet through
this port
.
Designated
Cost Root path cost 0
P
.
Pri
. )
Port
Priority
(
Port priority
)
high 4 bits of the Port ID
(
, Value
=
16 × N,
)
N
:
0~15
(
128
Port Interface number
)
lower 12 bits of the Port ID
( -