Well-Known Cisco WLAN Intervals

Knowing the interval at which major important functions occur within a wireless network is an important aspect when designing a network for optimal performance as well as when troubleshooting problems.

Jeremy Stretch has started a Well-Known Intervals wiki page on PacketLife.net to organize a community resource around this topic. Below, you will find a list of the most common and important timers for Cisco wireless networks, both Unified and Autonomous. I will be contributing these intervals for inclusion on Jeremy's wiki page.

Note that most (but not all) of these intervals are defaults, and can be changed through administrator configuration.

General

• 102.4 ms 802.11 Beacon Period (WLC and Aironet IOS)

Unified Wireless Network (7.0 Code Version)

• 1 sec EAP-Identity-Request Timeout
• 1 sec EAP-Request Timeout
• 1 sec EAPOL-KEY Timeout
• 1 sec CleanAir AP Sampling Interval
• 2 sec RADIUS / LDAP Server Timeout
• 2 sec NMSP Updates from WLC to Loc/MSE Server
• 10 sec 802.1x Supplicant Response Timeout 
• 10 sec Mobility Keepalive Interval
• 10 sec AP Discovery Timeout
• 15 sec CleanAir AP AQI Calculation Interval
• 20 sec WCP Keep-Alive Timer (WiSM/Cat65k/3750)
• 30 sec AP Heartbeat Timeout 
• 1 min RRM Neighbor Packets 
• 1 min CCX Location Measurement 
• 1 min Client Exclusion 
• 1 min IGMP Snooping Timeout 
• 90 sec Traffic Stream Metric Reports 
• 2 min AP Primary Discovery Timeout
• 3 min RRM Off-Channel Scanning Sweep Time
• 5 min Client Idle Timeout 
• 5 min ARP Timeout 
• 5 min RADIUS Fallback Interval 
• 5:20 min WCP Keep-Alive Timeout & Module Reboot (WiSM/Cat65k/3750)
• 10 min RF Group Update Interval 
• 10 min RRM DCA Channel Update Interval 
• 10 min RRM TPC Power Update Interval 
• 15 min CleanAir AQI Reporting Interval 
• 20 min Rogue Entry Timeout 
• 30 min Client Session Timeout 
• 1 day WLC Local Guest User Account Lifetime 
• 7 days CleanAir Persistent Device Avoidance Interval 

Autonomous Wireless Networks

• 2 sec RADIUS Server Timeout 
• 30 sec 802.1x Supplicant Response Timeout 
• 1 min Client Idle Timeout 

Cheers,
Andrew