Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
42
Multicast
When enabling multicast in the wireless LAN, performance and capacity must be considered.
If there is an associated client that is in power save mode, then all multicast packets will be queued until the DTIM period.
The Cisco Wireless IP Phone 8821 and 8821-EX utilize active mode primarily, but if there is an associated client that is in
power save mode, then all multicast packets will be queued until the DTIM period.
With multicast, there is no guarantee that the packet will be received the by the client.
The multicast traffic will be sent at the highest mandatory / basic data rate enabled on the access point, so will want to ensure
that only the lowest enabled rate is configured as the only mandatory / basic rate.
The client will send the IGMP join request to receive that multicast stream. The client will send the IGMP leave when the
session is to be ended.
The Cisco Wireless IP Phone 8821 and 8821-EX support the IGMP query feature, which can be used to reduce the amount of
multicast traffic on the wireless LAN when not necessary.
Ensure that IGMP snooping is also enabled on all switches.
Note:
If using Coexistence where 802.11b/g/n and Bluetooth are being used simultaneously, then multicast voice is not
supported.
Configuring the Cisco Wireless LAN
Cisco Wireless LAN Controller and Lightweight Access Points
When configuring the Cisco Wireless LAN Controller and Lightweight Access Points, use the following guidelines:
•
Ensure
802.11r (FT)
or
CCKM
is
Enabled
•
Set
Quality of Service (QoS)
to
Platinum
•
Set the
WMM Policy
to
Required
•
Ensure
Session Timeout
is enabled and configured correctly
•
Ensure
Aironet IE
is
Enabled
•
Set
DTPC Support
to
Enabled
•
Disable
P2P (Peer to Peer) Blocking Action
•
Ensure
Client Exclusion
is configured correctly
•
Disable
DHCP Address Assignment Required
•
Set
MFP Client Protection
to
Optional
or
Disabled
•
Set the
DTIM Period
to
2
•
Set
Client Load Balancing
to
Disabled
•
Set
Client Band Select
to
Disabled
•
Set
IGMP Snooping
to
Enabled
•
Enable
Symmetric Mobile Tunneling Mode
if Layer 3 mobility is utilized
•
Enable
ClientLink
if utilizing Cisco 802.11n capable Access Points
•
Configure the
Data Rates
as necessary
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