Device Configuration 5 - 27
Multiple Spanning Tree Protocol
(MSTP) provides an extension to RSTP to optimize the usefulness of VLANs. MSTP allows
for a separate spanning tree for each VLAN group, and blocks all but one of the possible alternate paths within each
spanning tree topology.
If there is just one VLAN in the access point managed network, a single spanning tree works fine. However, if the network
contains more than one VLAN, the network topology defined by single STP would work, but it is possible to make better
use of the alternate paths available by using an alternate spanning tree for different VLANs or groups of VLANs.
A MSTP supported deployment uses multiple MST regions with multiple
MST instances
(MSTI). Multiple regions and other
STP bridges are interconnected using one single
common spanning tree
(CST)
MSTP includes all of its spanning tree information in a single
Bridge Protocol Data Unit
(BPDU) format. BPDUs are used to
exchange information bridge IDs and root path costs. Not only does this reduce the number of BPDUs required to
communicate spanning tree information for each VLAN, but it also ensures backward compatibility with RSTP. MSTP
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 5-15
Ethernet Ports - Spanning Tree tab
19. 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.
Содержание AP-7131 Series
Страница 1: ...Motorola Solutions WiNG 5 5 ACCESS POINT SYSTEM REFERENCE GUIDE ...
Страница 2: ......
Страница 3: ...MOTOROLA SOLUTIONS WING 5 5 ACCESS POINT SYSTEM REFERENCE GUIDE MN000160A01 Revision A October 2013 ...
Страница 14: ...x WiNG 5 5 Access Point System Reference Guide ...
Страница 22: ...8 WiNG 5 5 Access Point System Reference Guide ...
Страница 26: ...1 4 WiNG 5 5 Access Point System Reference Guide ...
Страница 74: ...3 36 WiNG 5 5 Access Point System Reference Guide ...
Страница 411: ...Device Configuration 5 325 Figure 5 211 Mesh Point Auto Channel Selection Path Method Root Path Metric screen ...
Страница 428: ...6 2 WiNG 5 5 Access Point System Reference Guide Figure 6 1 Configuration Wireless menu ...
Страница 528: ...6 102 WiNG 5 5 Access Point System Reference Guide ...
Страница 610: ...8 40 WiNG 5 5 Access Point System Reference Guide ...
Страница 615: ...Services Configuration 9 5 Figure 9 2 Captive Portal Policy screen Basic Configuration tab ...
Страница 656: ...9 46 WiNG 5 5 Access Point System Reference Guide ...
Страница 670: ...10 14 WiNG 5 5 Access Point System Reference Guide ...
Страница 682: ...11 12 WiNG 5 5 Access Point System Reference Guide ...
Страница 721: ...Operations 12 39 Figure 12 40 Certificate Management Import New Trustpoint screen ...
Страница 738: ...12 56 WiNG 5 5 Access Point System Reference Guide ...
Страница 890: ...A 2 WiNG 5 5 Access Point System Reference Guide ...
Страница 952: ...B 62 WiNG 5 5 Access Point System Reference Guide ...
Страница 953: ......