Device Configuration 5 - 39
18. Refer to the Spanning Tree Port Cost table.
Define an Instance Index using the spinner control and then set the cost. The default path cost depends on the user defined
port speed. The cost helps determine the role of the port channel in the MSTP network. The designated cost is the cost for
a packet to travel from this port to the root in the MSTP configuration. The slower the media, the higher the cost.
19. Select + Add Row as needed to include additional indexes.
20. Refer to the Spanning Tree Port Priority table.
Define an Instance Index using the spinner control and then set the Priority. The lower the priority, a greater likelihood
of the port becoming a designated port.
21. Select + Add Row needed to include additional indexes.
22. Select OK to save the changes made to the Ethernet Port Spanning Tree configuration. Select Reset to revert to the last
saved configuration.
Link Type Select either the Point-to-Point or Shared radio button. Selecting Point-to-Point
indicates the port should be treated as connected to a point-to-point link. Selecting
Shared means this port should be treated as having a shared connection. A port
connected to a hub is on a shared link, while one connected to a access point is a point-
to-point link. Point-to-Point is the default setting.
Cisco MSTP
Interoperability
Select either the Enable or Disable radio buttons. This enables interoperability with
Cisco’s version of MSTP, which is incompatible with standard MSTP. This setting is
disabled by default.
Force Protocol Version Sets the protocol version to either STP(0), Not Supported(1), RSTP(2) or MSTP(3). MSTP
is the default setting.
Guard Determines whether the port channel enforces root bridge placement. Setting the
guard to Root ensures the port is a designated port. Typically, each guard root port is a
designated port, unless two or more ports (within the root bridge) are connected
together. If the bridge receives superior Bridge Protocol Data Units (BPDUs) on a guard
root-enabled port, the guard root moves the port to a root-inconsistent STP state. This
state is equivalent to a listening state. No data is forwarded across the port. Thus, the
guard root enforces the root bridge position.
Speed Default Path Cost
<=100000 bits/sec 200000000
<=1000000 bits/sec 20000000
<=10000000 bits/sec 2000000
<=100000000 bits/sec 200000
<=1000000000 bits/sec 20000
<=10000000000 bits/sec 2000
<=100000000000 bits/sec 200
<=1000000000000 bits/sec 20
>1000000000000 bits/sec 2
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