Roaming - Cisco 8861 Deployment Manual

mls qos
!
interface X
mls qos trust dscp
If utilizing Cisco Meraki MS Switches, reference the Cisco Meraki MS Switch VoIP Deployment Guide.
https://meraki.cisco.com/lib/pdf/meraki_whitepaper_msvoip.pdf
Note: When using the Cisco Wireless LAN Controller, DSCP trust must be implemented or must trust the UDP data ports used
by the Cisco Wireless LAN Controller (CAPWAP = UDP 5246 and 5247) on all interfaces where wireless packets will traverse
to ensure QoS markings are correctly set.
Configuring Cisco Switch Ports for Wired IP Phones
Enable the Cisco wired IP phone switch ports for Cisco phone trust.
Below is a sample switch configuration:
mls qos
!
Interface X
mls qos trust device cisco-phone
mls qos trust dscp

Roaming

The Cisco IP Phone 8861 and 8865 default to Auto for the 802.11 mode, which allows the Cisco IP Phone 8861 and 8865 to
connect to either 5 GHz or 2.4 GHz and enables interband roaming support.
802.11r / Fast Transition (FT) is the recommended deployment model for all environment types where frequent roaming occurs.
802.1x authentication is required in order to utilize CCKM.
802.1x without 802.11r (FT) or CCKM can introduce delay during roaming due to its requirement for full re-authentication.
WPA and WPA2 introduce additional transient keys and can lengthen roaming time.
When 802.11r (FT) or CCKM is utilized, roaming times can be reduced from 400-500 ms to less than 100 ms, where that
transition time from one access point to another will not be audible to the user.
The Cisco IP Phone 8861 and 8865 support 802.11r (FT) with WPA2 (AES) or WPA2-PSK (AES) and CCKM with WPA2
(AES or TKIP) and WPA (TKIP or AES).
Authentication
WPA/WPA2 Personal
WPA/WPA2 Enterprise
802.11r (FT)
CCKM
Cisco IP Phone 8861 and 8865 Wireless LAN Deployment Guide
Roaming Time
150 ms
300 ms
< 100 ms
< 100 ms
34