Device Configuration 5 - 29
encodes additional region information after the standard RSTP BPDU as well as a number of MSTI messages. Each MSTI
messages conveys spanning tree information for each instance. Each instance can be assigned a number of configured
VLANs. The frames assigned to these VLANs operate in this spanning tree instance whenever they are inside the MST
region. To avoid conveying their entire VLAN to spanning tree mapping in each BPDU, the access point encodes an MD5
digest of their VLAN to an instance table in the MSTP BPDU. This digest is used by other MSTP supported devices to
determine if the neighboring device is in the same MST region as itself.
Figure 5-16 Ethernet Ports - Spanning Tree tab
21. Refer to the PortFast field to define the following:
Enable PortFast PortFast reduces the time taken for a port to complete STP. PortFast must only be
enabled on ports on the wireless controller which are directly connected to a server/
workstation and not to another hub or controller. PortFast can be left unconfigured on
the 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.
Enable PortFast BPDU
Filter
MSTP BPDUs are messages exchanged when controllers gather information about the
network topology during STP scan. When enabled, PortFast enabled ports do not
transmit or receive BPDU messages. 'Default' sets the PortFast BPDU Filter value to the
bridge's BPDU filter value.
Select Enable to invoke a BPDU filter for this PortFast enabled port channel.
Enable PortFast BPDU
Guard
When enabled, PortFast enabled ports are forced to shut down when they receive BPDU
messages. When set to Default sets the PortFast BPDU Guard value to the bridge's
BPDU guard value.
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