Nortel Networks NN43001-504 User Manual
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Appendix B Troubleshooting WLAN IP Telephony installations
You must add B and C as members under mobility group
configuration for switch A.
You must add A and C as members under mobility group
configuration for switch B.
You must add A and B as members under mobility group
configuration for switch C.
The above recommendation is true in the case of VoDATA as well.
WLAN Security Switch 2270 notes
The following list contains important information about the WLAN Security
Switch 2270 and pre-3.2.116.21 code.
•
In the 2.0.x code for the WLAN Security Switch 2270, multicast packets
are directly handled by the CPU. Nortel Handsets use multicast packets
only when the Push-to-talk (PTT) feature is used. Because the CPU
handles all multicast packets (control+data) with the 2.0.c code, there
can be problems with voice quality for PTT conversations, as well as
for regular calls.
The multicast issues are resolved in the 2.2.x code. With the 2.2.x code,
to ease the CPU processing load, multicast packets are off-loaded to
another hardware chip within the 2270.
•
In the 2.0.x code, if GOLD QoS is enabled for voice SSID, APs can
fail to run RRM sampling while packets are processed in the GOLD
queue. Therefore, the AutoRFR calculations on the WLAN Security
Switch 2270 are further delayed. You must watch out for AutoRF issues
in such scenario. If it is a pure voice implementation, you can assign
SILVER QoS to voice SSID. This is only a best-effort recommendation.
If the voice traffic drops as a result, move back to GOLD QoS for voice.
•
The PTT feature does not work in 2.0 code if the WLAN Security Switch
2270 is configured in L2-LWAPP mode. This issue is resolved in the
2.2.x code.
•
There is a client-handoff feature in the advanced options in the
command line interface (CLI) for release 3.0.107.0.
For more information, go to
To configure the client handoff to occur after a selected number
of 802.11 data packet excessive retries, use the config advanced
client-handoff command:
config advanced client-handoff <num_of_retries>
Default: 0 excessive retries (disabled)
The command to configure the client handoff to 100 excessive retries is:
config advanced client-handoff 100
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504
01.02
Standard
Release 5.0
15 June 2007
Copyright © 2004-2007, Nortel Networks
.