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Unied Access Point Administrator’s Guide
Unied Access Point Administrator’s Guide
Page 42
March 2012
Section 4 - Managing the Access Point
Field Description
Short Guard Interval
Supported
This eld is available only if the selected radio mode includes 802.11n.
The guard interval is the dead time, in nanoseconds, between OFDM symbols. The guard
interval prevents Inter-Symbol and Inter-Carrier Interference (ISI, ICI). The 802.11n mode
allows for a reduction in this guard interval from the a and g denition of 800 nanoseconds
to 400 nanoseconds. Reducing the guard interval can yield a 10% improvement in data
throughput.
Select one of the following options:
•) Yes — The AP transmits data using a 400ns guard Interval when communicating with
clients that also support the short guard interval.
•) No — The AP transmits data using an 800ns guard interval.
STBC Mode This eld is available only if the selected radio mode includes 802.11n.
Space Time Block Coding (STBC) is an 802.11n technique intended to improve the reliability
of data transmissions. The data stream is transmitted on multiple antennas so the receiving
system has a better chance of detecting at least one of the data streams.
Select one of the following options:
•) On — The AP transmits the same data stream on multiple antennas at the same time.
•) Off — The AP does not transmits the same data on multiple antennas.
Protection The protection feature contains rules to guarantee that 802.11n transmissions do not cause
interference with legacy stations or APs. By default, these protection mechanisms are
enabled (Auto). With protection enabled, protection mechanisms will be invoked if legacy
devices are within range of the AP. This causes more overhead on every transmission,
which will impact performance. However, there is no impact on performance if there are no
legacy devices within range of the AP.
You can disable (Off) these protection mechanisms; however, when 802.11n protection is
off, legacy clients or APs within range can be affected by 802.11n transmissions. The 802.11
protection feature is also available when the mode is 802.11b/g. When protection is enabled
in this mode, it protects 802.11b clients and APs from 802.11g transmissions.
Note: This setting does not affect the ability of the client to associate with the AP.
Beacon Interval Beacon frames are transmitted by an AP at regular intervals to announce the existence
of the wireless network. The default behavior is to send a beacon frame once every 100
milliseconds (or 10 per second).
Enter a value from 20 to 2000 milliseconds.
DTIM Period Specify a DTIM period from 1 to 255 beacons.
The Delivery Trafc Information Map (DTIM) message is an element included in some
Beacon frames. It indicates which client stations, currently sleeping in low-power mode,
have data buffered on the AP awaiting pick-up.
The DTIM period you specify indicates how often the clients served by this AP should check
for buffered data still on the AP awaiting pickup.
The measurement is in beacons. For example, if you set this eld to 1, clients will check
for buffered data on the AP at every beacon. If you set this eld to 10, clients will check on
every 10th beacon.
Fragmentation
Threshold
Specify a number between 256 and 2,346 to set the frame size threshold in bytes.
The fragmentation threshold is a way of limiting the size of packets (frames) transmitted
over the network. If a packet exceeds the fragmentation threshold you set, the fragmentation
function is activated and the packet is sent as multiple 802.11 frames.
If the packet being transmitted is equal to or less than the threshold, fragmentation is not
used.
Setting the threshold to the largest value (2,346 bytes) effectively disables fragmentation.
Fragmentation plays no role when Aggregation is enabled.
Fragmentation involves more overhead both because of the extra work of dividing up and
reassembling of frames it requires, and because it increases message trafc on the network.
However, fragmentation can help improve network performance and reliability if properly
congured.
Sending smaller frames (by using lower fragmentation threshold) might help with some
interference problems; for example, with microwave ovens.
By default, fragmentation is off. We recommend not using fragmentation unless you suspect
radio interference. The additional headers applied to each fragment increase the overhead
on the network and can greatly reduce throughput.
Содержание
- Section 1 about this document 2
- Section 2 getting started 1 2
- Section 3 viewing access point status 2 2
- Section 4 managing the access point 5 2
- Table of contents 2
- Section 5 configuring access point services 5 3
- Section 6 configuring snmpv3 5 3
- Section 7 maintaining the access point 9 3
- Section 8 configuring client quality of service qos 8 3
- Section 9 clustering multiple aps 04 3
- Appendix a default ap settings 13 4
- Appendix b configuration examples 15 4
- Appendix c statements 27 4
- List of figures 5
- List of tables 7
- Additional documentation 9
- Document conventions 9
- Document organization 9
- Section 1 about this document 9
- Online help supported browsers and limitations 10
- Administrator s computer requirements 11
- Section 2 getting started 11
- Wireless client requirements 12
- Discovering a dynamically assigned ip address 13
- Dynamic and static ip addressing on the ap 13
- Installing the uap 13
- Recovering an ip address 13
- Basic settings 16
- Connecting to the ap web interface by using the ipv6 address 17
- Using the cli to view the ip address 17
- Configuring the ethernet settings 18
- Using the cli to configure ethernet settings 18
- Action commands 19
- Configuring ieee 802 x authentication 19
- For example 19
- If your network uses ieee 802 x see configuring ieee 802 x authentication on page 19 for information about how to configure 802 x by using the web interface 19
- In the following example the administrator uses the cli to set the management vlan id to 123 and to disable the untagged vlan so that all traffic is tagged with a vlan id 19
- March 2012 19
- On networks that use ieee 802 x port based network access control a supplicant client cannot gain access to the network until the 802 x authenticator grants access if your network uses 802 x you must configure 802 x authentication information that the ap can supply to the authenticator 19
- Section 2 getting started 19
- Set a subnet mask 19
- Set dns nameservers to use dhcp ip addressing manual to dynamic mode 19
- Set dns nameservers to use static ip addresses dynamic to manual mode 19
- Set the default gateway 19
- Set the static ip address 19
- Unified access point administrator s guide 19
- Unified access point administrator s guide page 19 19
- Use a static ip as the connection type 19
- Use dhcp as the connection type 19
- View the dns nameserver mode dynamic up manual down 19
- Using the cli to configure 802 x authentication information 20
- Verifying the installation 20
- Configuring security on the wireless access point 21
- Section 3 viewing access point status 22
- Viewing interface status 22
- Wired settings internal interface 22
- Wireless settings 22
- Configuring persistent logging options 23
- Viewing events 23
- Configuring the log relay host for kernel messages 24
- Enabling or disabling the log relay host on the events page 24
- Viewing transmit and receive statistics 25
- Viewing associated wireless client information 26
- Viewing tspec client associations 26
- Link integrity monitoring 28
- Viewing rogue ap detection 28
- Saving and importing the known ap list 30
- Viewing managed ap dhcp information 31
- Viewing tspec status and statistics information 31
- Viewing tspec ap statistics information 32
- Viewing radio statistics information 33
- Viewing email alert operational status 34
- Ethernet settings 35
- Section 4 managing the access point 35
- Wireless settings 37
- Enabling aeroscout engine support 39
- Using the 802 1h wireless mode 39
- Modifying radio settings 40
- Configuring radio and vap scheduler 44
- Scheduler association settings 46
- Virtual access point settings 47
- None plain text 50
- Static wep 50
- Ieee 802 x 51
- Wpa personal 53
- Wpa enterprise 54
- Configuring the wireless distribution system wds 56
- Wep on wds links 58
- Wpa psk on wds links 58
- Configuring a mac filter and station list on the ap 59
- Controlling access by mac authentication 59
- Configuring load balancing 60
- Configuring mac authentication on the radius server 60
- Managed access point overview 61
- Transitioning between modes 61
- Configuring managed access point settings 62
- Configuring 802 x authentication 63
- Creating a management access control list acl 64
- Section 5 configuring access point services 65
- Web server settings 65
- Configuring snmp on the access point 66
- Setting the ssh status 68
- Configuring quality of service 69
- Setting the telnet status 69
- Configuring email alert 72
- Enabling the time settings ntp 73
- Configuring snmpv3 views 75
- Section 6 configuring snmpv3 75
- Configuring snmpv3 groups 76
- Configuring snmpv3 users 77
- Configuring snmpv3 targets 78
- Saving the current configuration to a backup file 79
- Section 7 maintaining the access point 79
- Restoring the configuration from a previously saved file 80
- Performing ap maintenance 81
- Rebooting the access point 81
- Resetting the factory default configuration 81
- Upgrading the firmware 81
- Packet capture configuration and settings 83
- Packet capture status 83
- Packet capture parameter configuration 84
- Packet file capture 84
- Remote packet capture 85
- Packet capture file download 87
- Configuring vap qos parameters 88
- Section 8 configuring client quality of service qos 88
- Ipv4 and ipv6 acls 89
- Managing client qos acls 89
- Acl configuration process 90
- Mac acls 90
- Creating a diffserv class map 95
- Defining diffserv 96
- Creating a diffserv policy map 100
- Client qos status 101
- Configuring radius assigned client qos parameters 102
- March 2012 103
- Radius attribute id description type range 103
- Section 8 configuring client quality of service qos 103
- Unified access point administrator s guide 103
- Unified access point administrator s guide page 103 103
- Clustering aps 104
- Managing cluster access points in the cluster 104
- Section 9 clustering multiple aps 104
- Viewing and configuring cluster members 104
- Adding an access point to a cluster 106
- Managing cluster sessions 106
- Navigating to an ap by using its ip address in a url 106
- Navigating to configuration information for a specific ap 106
- Removing an access point from the cluster 106
- Sorting session information 107
- Configuring and viewing channel management settings 108
- Stopping starting automatic channel assignment 108
- Configuring advanced settings 109
- Viewing current channel assignments and setting locks 109
- Viewing the last proposed set of changes 109
- Viewing wireless neighborhood information 110
- Viewing details for a cluster member 112
- Appendix a default ap settings 113
- Appendix b configuration examples 115
- Configuring a vap 115
- Vap configuration from the cli 115
- Vap configuration from the web interface 115
- Configuring radio settings 116
- Vap configuration using snmp 116
- Radio configuration from the cli 117
- Radio configuration from the web interface 117
- Configuring the wireless distribution system 118
- Radio configuration using snmp 118
- Wds configuration from the web interface 118
- Clustering access points 119
- Clustering aps by using the web interface 119
- Wds configuration from the cli 119
- Wds configuration using snmp 119
- Clustering aps by using snmp 120
- Clustering aps by using the cli 120
- Configuring client qos 121
- Configuring qos by using the web interface 121
- Configuring qos by using the cli 124
- Appendix c statements 127
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