5 - 46 WiNG 5.6 Access Point System Reference Guide
17. Define the following PortFast parameters for the port channel’s MSTP configuration:
18. Set the following MSTP Configuration parameters for the port channel:
19. 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.
Enable PortFast PortFast reduces the time required for a port to complete a MSTP state change from
Blocked to Forward. PortFast must only be enabled on ports on the wireless controller
directly connected to a server/workstation and not another hub or controller. PortFast can
be left unconfigured on an access point.
Select this option to enable drop-down menus for both the Enable PortFast BPDU Filter
and Enable PortFast BPDU Guard options. This setting is disabled by default.
PortFast BPDU Filter Select Enable to invoke a BPDU filter for this PortFast enabled port channel. Enabling the
BPDU filter feature ensures this port channel does not transmit or receive any BPDUs. The
default setting is None.
PortFast BPDU Guard Select Enable to invoke a BPDU guard for this PortFast enabled port channel. Enabling the
BPDU Guard feature means this port will shutdown on receiving a BPDU. Thus, no BPDUs
are processed. The default setting is None.
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
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