Instruction Manual
69
Path Cost
Control the Path Cost incurred by this port. The “Auto” setting
will set the path cost as appropriate by physical link speed, using
the 802.1D recommended values. Using “specific” settings, a
user-defined value can be entered. The path cost is used when
establishing the active topology of the network. Low path cost
ports are chosen as forwarding ports in favour of higher path cost
ports. (Range is 1 to 200000000.)
Priority
Control the port priority. This can be used to control priority of
the ports having identical port cost.
Admin Edge
Enable this option if this port is connected to an end node or at
the end of the bridge.
Auto Edge
Control whether automatic edge detection is enabled on a
bridge port.
Restricted role
If enabled, cause the port not to be selected as Root port for the
CIST, even if it has the best spanning tree priority vector. This
features is also known as Root Guard.
Restricted TCN
If enabled, this causes the port not to propagate received
topology change notifications and topology changes to other
ports. If set, it can cause temporary loss of connectivity after
changes in a spanning tree’s active topology as a result of
persistently incorrect learned station location information. It is set
by a network administrator to prevent external bridges to a core
region of the network, causing address flushing in that region,
possibly because those bridges are not under the full control of
the administrator or the physical link state of the attached LANs
transits frequently.
BDPU Guard
If enabled, causes the port to disable itself upon receiving valid
BPDUs. Contrary to the similar bridge setting, the port Edge
status doesn’t affect this setting.
Point-to-Point
Controls whether the port connects to a point-to-point LAN
rather than a shared medium. This can be automatically
determined, or forced either true or false. The transition to the
forwarding state is faster for point-to-point LANs than for shared
media.
1. On the main screen of the Web management UI, click
Configuration
>
Spanning
Tree
>
CIST Ports
.
2. Configure the required attributes.
