Brocade Mobility Access Point System Reference Guide (Supporting software release 5.5.0.0 and later) User Manual

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Brocade Mobility Access Point System Reference Guide

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16. Set the following MSTP Configuration parameters for the port channel:

17. 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.

18. Select + Add Row as needed to include additional indexes.

19. 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.

20. Select + Add Row needed to include additional indexes.

21. Select OK to save the changes made to the Ethernet Port Spanning Tree configuration. Select

Reset to revert to the last saved configuration.

Enable as Edge Port

Select this option to define this port as an edge port. Using an edge (private) port, you can isolate
devices to prevent connectivity over this port channel. This setting is disabled by default.

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

>1000000000000 bits/sec