Technical data

54 Meru System Director Configuration Guide © 2012 Meru Networks, Inc.
Add an ESS with the Web UI
18. In Release 5.1, the Virtual Port setting has no effect. Virtual Port is on if Virtual
Cell is on and off if Virtual Cell is off.
19. If Virtual Cell is off and the APs are any AP300 or AP400 model, you can make this
ESS an “overflow” ESS by selecting a Virtual Cell ESS for the Overflow for:
setting. This means that when the named Virtual Cell ESS (that was created
earlier) maxes out, it will overflow into this non-Virtual Cell ESS. This works by
having the two ESS Profiles share an SSID so they can seamlessly move clients back
and forth as needed. For more explanation, see Virtual Cell Overflow Feature.
20. In release 5.1, WMM configuration in the ESSID has no effect. However, in order
to enable or disable APSD features across APs, the WMM parameter must be set
to on. WMM Classification for different traffic patterns is not supported by AP150
models. For more information, see WMM Features Supported by System Director.
21. For APSD support, select on or off. APSD stands for Advanced WMM Power Save
and is supported AP300/AP400/AP1000. For more explanation, see WMM Features
Supported by System Director.
On: Data packets for powersave mode clients are buffered and delivered based
on the trigger provided by the client. This feature saves more power and provides
longer lifetime for batteries than the legacy power save mode (TIM method). Note
that you must have WMM set to on for this to work - see previous step.
Off: No APSD support.
22. DTIM affects clients in power save mode. In the DTIM Period field, type the
number of beacon intervals that elapse before broadcast and multicast frames
stored in buffers are sent. This value is transmitted in the DTIM period field of
beacon frames.
The DTIM period can be a value from 1 through 255. The default DTIM period is 1.
Setting the DTIM period to a higher value decreases the frequency of broadcasts
sent by the access point. If power save is enabled on clients that are connected
to access points, clients “wake up” less if fewer broadcasts are sent, which
conserves battery life for the clients.
Only the behavior of clients currently in power-save mode is affected by the DTIM
period value. Because broadcasts are generally wasteful of air resources, the
Meru WLAN has devised mechanisms that mitigate broadcasts either with proxy
services or with more efficient, limited unicasts. As an example, ARP Layer 2
broadcasts received by the wired side are not relayed to all wireless clients.
Instead, the Meru controller maintains a list of IP-MAC address mappings for all
wireless clients and replies with proxy-ARP on behalf of the client.
23. In the Dataplane Mode list, select the type of AP/Controller configuration:
— Tunneled: (default) In tunneled mode, a controller and an AP300/AP1000 are
connected with a data tunnel so that data and control packets from a mobile
station are tunneled to the controller from the AP and vice versa.
Note: If you set Virtual Cell on for an ESS used with AP300s or AP400s and then turn
it off, Virtual Cell capability is removed from the interface and must be added to the
interface again if Virtual Cell is turned on again in the ESS. To add the SSID back to
AP300 or AP400, the best option is to delete the ESS profile and then re-add it.
Alternately, you can add a BSSID to each and every interface manually. Note with this
last option, if there are multiple APs in network then this option does not help.