ZyXEL Communications MSC1000G Series, User Manual

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Chapter 13 Switch Screens
Management Switch Card User’s Guide
529
13.12.2 MSTP Port Settings
Click Switch > MSTP > Port to display the configuration screen as shown. Use this screen to set
the MST settings on the switch ports.
Figure 362
MSTP: Port
The following table describes the labels in this screen.
VID This field displays the VID (or VID ranges) to which the MST instance is mapped.
Config Digest A configuration digest is generated from the VLAN-MSTI mapping information. This field
displays the 16-octet signature that is included in an MSTP BPDU. This field displays the digest
when MSTP is activated on the system.
Table 279
MSTP: Bridge (continued)
LABEL DESCRIPTION
Table 280
MSTP: Port
LABEL DESCRIPTION
MSTID Select an MST region ID from the drop-down list box and click Load to show the MST region’s
port settings.
Port This column lists the management switch card’s Gigabit Ethernet interfaces.
Enable Select this option to set the port to be a member of the selected MST region.
Priority When a loop occurs and two ports have the same path cost, the port with a higher priority (lower
numerical value) becomes the root port and the other port becomes an alternate port.
Specify the port priority in the spanning tree. Enter a number (between 1 and 255). 7Enter a
smaller number to have the switch select this port first. If two ports have the same priority, the
switch will select the one with the smallest port ID (which consists of the port priority and port
number).
Path Cost When a loop occurs, MSTP selects the port with the lowest path cost to the root bridge.
Specify the path cost (between 0 and 200000000) for the port. Enter a smaller number to have
the switch select this port first. Enter 0 to have to system automatically determines the path cost
based on the link speed. If two ports have the same path cost, the switch will select the one with
the highest priority.
Edge An edge port connects to a non-STP device.
Select this option to set the port as an edge port. The switch immediately sets this port to the
forwarding state when a link failure is detected. This allows for fast recovery.