IS5 COMMUNICATIONS IES12G, Руководство пользователя

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iES12G User’s Manual
UM-iES12G-1.72.2-EN.docx Pages 51 of 166
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Figure 59 – STP MSTI Port Configuration
Label Description
Port
The switch port number of the logical STP port
STP Enabled Check to enable STP for the port
Path Cost
Configures the path cost incurred by the port. Auto will set the path cost according
to the physical link speed by using the 802.1D-recommended values. Specific allows
the user to enter a user-defined value. The path cost is used when establishing an
active topology for the network. Lower path cost ports are chosen as forwarding ports
in favor of higher path cost ports. The range of valid values is 1 to 200000000.
Priority Configures the priority for ports having identical port costs. (See above).
Admin Edge
Configures the operEdge flag should start as set or cleared.(the initial operEdge
stated when a port is initialized).
Auto Edge
Check to enable the bridge to detect edges at the bridge port automatically. This
allows operEdge to be derived from whether BPDUs are received on the port or not.
Restricted
Role
When enabled, the port will not be selected as root port for CIST or any MSTI, even if
it has the best spanning tree priority vector. Such a port will be selected as an alternate
port after the root port has been selected. If set, spanning trees will lose connectivity.
It can be set by a network administrator to prevent bridges outside a core region of
the network from influencing the active spanning tree topology because those
bridges are not under the full control of the administrator. This feature is also known as
Root Guard.