Well-Known Intervals

Tony Mattke
Networking
August 10, 2015

Listed below are many events which occur on network devices at well-known intervals. The list is provided to serve as an aid while troubleshooting recurring network disruptions. Please consider helping to expand this list by adding other recurrent issues you encounter not already listed.

This list was generated by Jeremy Stretch from PacketLife, but lost after he took his wiki down. Luckily I had previously saved it, as I found it useful, and with his permission I’ve reposted it here.

Short (<=5 minutes)

1 Second

Default VRRP hello timer
Default EAP-Identity-Request Timeout (Unified WLAN)
Default EAP-Request Timeout (Unified WLAN)
Default EAPOL-KEY Timeout (Unified WLAN)
CleanAir AP Sampling Interval (Unified WLAN)
Default Group Specific Query interval (Maximum Response Time of 10) for IGMPv2

2 Seconds

Default IEEE 802.1D STP hello timer
Default RADIUS / LDAP Server Timeout (Unified & Autonomous WLAN)
Default NMSP Updates from WLC to Loc/MSE Server (Unified WLAN)
Default IGMPv2 Last Member Query Count x 2

3 Seconds

Default GLBP hello timer (Cisco IOS)
Default HSRP hello timer (Cisco IOS)

5 Seconds

Default EIGRP hello timer on links >= 1.544 Mbps (Cisco IOS)
Default LDP hello timer for links (Cisco IOS)

10 Seconds

Default HSRP hold timer (Cisco IOS)
Default IS-IS hello timer (Cisco IOS)
Default OSPF hello timer on broadcast and point-to-point links (Cisco IOS/JunOS)
Default 802.1x Supplicant Response Timeout (Unified WLAN)
Default Mobility Keepalive Interval (Unified WLAN)
Default AP Discovery Timeout (Unified WLAN)
Default LDP hello timer for targeted LDP (Cisco IOS)
Default LMI Frame Relay message
Default IGMPv2 Query Response Interval

15 Seconds

Default EIGRP hold timer on links >= 1.544 Mbps (Cisco IOS)
Default IEEE 802.1D STP forwarding delay
Default UDLD probe interval (Cisco IOS)
CleanAir AP AQI Calculation Interval (Unified WLAN)
Default LDP hold timer for link hellos (Cisco IOS)
Default LDP hello timer for targeted LDP (JunOS)

20 Seconds

Default IEEE 802.1D STP maximum BPDU age
WCP Keep-Alive Timer (Unified WLAN WiSM/Cat65k/3750)

30 Seconds

Default IS-IS hold timer (Cisco IOS)
Default LLDP advertisement interval (Cisco IOS)
Default OSPF hello timer on nonbroadcast links (Cisco IOS)
Default RIP update interval
Default AP Heartbeat Timeout (Unified WLAN)
Default 802.1x Supplicant Response Timeout (Autonomous WLAN)
Default DTP hello interval (Cisco IOS)

40 Seconds

Default OSPF hold timer on broadcast and point-to-point links (Cisco IOS/JunOS)

45 Seconds

Default LDP hold timer for targeted hellos (JunOS)

60 Seconds

Default BGP keepalive interval
Default BGP scan time for next-hop validation (Cisco IOS)
Default CDP advertisement interval (Cisco IOS)
Default EIGRP hello timer on links < 1.544 Mbps (Cisco IOS)
Default NAT DNS translation timeout (Cisco IOS)
Default NAT ICMP translation timeout (Cisco IOS)
Default NAT TCP SYN packet translation timeout (Cisco IOS)
Default NAT TCP FIN/RST packet translation timeout (Cisco IOS)
Default RRM Neighbor Packets (Unified WLAN)
Default CCX Location Measurement (Unified WLAN)
Default Client Exclusion (Unified WLAN)
Default IGMP Snooping Timeout (Unified WLAN)
Default Client Idle Timeout (Autonomous WLAN)
Default LMI Frame Relay full Status message (every 6th message)

90 Seconds

Traffic Stream Metric Reports (Unified WLAN)
Default LDP hold timer for targeted hellos (Cisco IOS)

120 Seconds

Default OSPF hello timer on nonboradcast links (Junos)
Default OSPF hold timer on nonbroadcast links (Cisco IOS)
Default AP Primary Discovery Timeout (Unified WLAN)

125 Seconds

Default IGMPv2 Query Interval

180 Seconds

Default BGP hold timer
Default EIGRP hold timer on links < 1.544 Mbps (Cisco IOS)
Default RIP holddown timer
Default RIP invalidation timer
EIGRP SIA
Default RRM Off-Channel Scanning Sweep Time (Unified WLAN)

240 Seconds

Default RIP flush timer

255 Seconds

Default IGMPv2 Other Querier Present Interval

260 Seconds

Default IGMPv2 Group Membership Interval

300 Seconds

Default DHCP snooping database transfer timeout (Cisco IOS)
Default NAT UDP translation timeout (Cisco IOS)
Default recovery period for many errdisable triggers (Cisco IOS)
Default MAC address table aging time (Cisco IOS)
Default TCP session timer (F5 BIG-IP)
Default Client Idle Timeout (Unified WLAN)
Default ARP Timeout (Unified WLAN)
Default RADIUS Fallback Interval (Unified WLAN)

Long (>5 Minutes)

5 Minutes, 20 Seconds

WCP Keep-Alive Timeout & Controller Reboot (Unified WLAN WiSM/Cat65k/3750)

10 Minutes

Default VTY exec-timeout (Cisco IOS)
Default GLBP redirect timer
Default RF Group Update Interval (Unified WLAN)
Default RRM DCA Channel Update Interval (Unified WLAN)
Default RRM TPC Power Update Interval (Unified WLAN)

15 Minutes

CleanAir AQI Reporting Interval (Unified WLAN)

16 Minutes, 40 Seconds

Default IGMP leave timer (Cisco IOS)

20 Minutes

Default Rogue Entry Timeout (Unified WLAN)

30 Minutes

OSPF LSA refresh timer
Default Client Session Timeout (Unified WLAN)

60 Minutes

OSPF LSA expiration timer

120 Minutes

TCP Keep_Alive Timer/Interval (default)

4 Hours

Default ARP timeout (Cisco IOS)
Default GLBP timeout timer

24 Hours

Default NAT TCP translation timeout (Cisco IOS)
Default WLC Local Guest User Account Lifetime (Unified WLAN)

7 Days

CleanAir Persistent Device Avoidance Interval (Unified WLAN)