User Manual

AT-S62 Management Software Web Browser Interface User’s Guide
Section IV: Spanning Tree Protocols 291
This is also an MSTI-specific parameter. Like the priority parameter,
you can, using the MSTI List, assign a different internal path cost for
each MSTI where the port is a member.
MSTI List
The MSTIs defined on the switch. You can use this list when setting the
port priority and port internal path cost parameters to assign different
values to a port for each MSTI when the port is a member. Before
setting priority or internal path cost, select the appropriate MSTI where
you want the new setting to be applied on the port. The default is all
MSTIs on the switch.
The MSTI List shows all of the spanning tree instances on the switch,
and not just those where the selected port is currently a member. If you
select an MSTI where the port is not a member, you can pre-configure
the parameter in the event you later add the port as a member of the
MSTI through a VLAN assignment.
Point-to-Point
This parameter defines whether the port is functioning as a point-to-
point port. For an explanation of this parameter, refer to the AT-S62
Menus Interface User’s Guide.
Port External Path Cost
The port cost of the port if the port is connected to a bridge which is a
member of another MSTP region or is running STP or RSTP. The
range is 0 to 200,000,000. The default setting is Auto, which sets port
cost depending on the speed of the port. Table 15 lists the MSTP port
costs with the Auto setting when the port is not a member of a trunk.
1000 Mbps 2,000
Table 15. MSTP Auto External Path Costs
Port Speed Port Cost
10 Mbps 2,000,000
100 Mbps 200,000
1000 Mbps 20,000
Table 14. MSTP Auto Update Port Trunk Internal Path Costs
Port Speed Port Cost