Time Constants

Packet Tracer uses the following time constants:

RIP/RIPv6 default update | 30 secs
RIP/RIPv6 default timeout | 3 mins
RIP/RIPv6 default flush timeout | 4 mins
RIP/RIPv6 default hold-down | 3 mins
MAC table entry timeout | 5 mins
ARP request timer | 2 secs
ARP table entry timeout | 4 hrs
CDP update timer | 1 min
CDP neighbor hold-down timer | 3 mins
DHCP client timeout | 5 secs
CSMA/CD waiting time to resend | random
LMI timeout | 15 secs
LMI signaling | 5 secs
Inverse ARP | 30 secs
HDLC keepalive | 5 secs
HDLC timeout | 15 secs
NAT/NAT-PT entries timeout | Depends on the encapsulation protocol
NAT/NAT-PT entry encapsulated in a UDP | 5 mins
NAT/NAT-PT entry encapsulated in a TCP | 24 hrs
NAT/NAT-PT entry encapsulated in a ICMP | 1 min
CHAP timeout | 5 secs
CHAP re-authenticate timeout | 10 secs
DIALING no answer timeout | 5 secs
DIALING no dial tone timeout | 2 secs
PPP keepalive interval | 5 secs
Timeout | 15 secs
EIGRP/EIGRPv6 Hello time interval period | 5 secs
EIGRP/EIGRPv6 Hold time interval period | 15 secs
ICMP | 1 ms
STP Max Age | 20 secs
STP Hello | 2 secs
STP Forward Delay | 15 secs
STP Topology Change Notify Timer | 2 secs
STP Topology Change Timer | 35 secs
RSTP Migration Delay Timer | 3 secs
OSPF/OSPFv3 SPF Hold Time | 10 secs
OSPF/OSPFv3 LS Refresh Time | 30 mins
OSPF/OSPFv3 SPF Delay Timer | 5 secs
OSPF/OSPFv3 LSA Retransmission Time | 5 secs
OSPF/OSPFv3 minimum LSA Arrival Time | 1 sec
OSPF/OSPFv3 Delayed Acknowledgment Timer | 2.5 secs
OSPF/OSPFv3 Dead Interval | 40 secs
OSPF/OSPFv3 Hello | 10 secs
OSPF/OSPFv3 Wait Interval | 40 secs
TCP Connection Timeout | 60 secs
TCP Initial Retransmission Timeout | 300 msec
TCP Min Retransmission Timeout | 50 msec
TCP Max Retransmission Timeout | 1000 msec (1 sec)
TCP Inactivity Timeout | 1 hour
TCP Close Timeout | 10 secs
DNS Request Timeout | 3 secs
DHCP Timeout | 5 secs
DHCP Discovery Timeout | 55 secs
DTP Hello | 30 secs
DTP Timeout | 5 mins
Password Timeout | 30 secs
ND Neighbor Request Timer | 2 secs
ND Neighbor Stale Timer | 30 secs
ND Neighbor Timeout Timer | 4 hrs
ND Router Solicitation Interval | 4 secs
ND Router Advertisement Interval | <= 16 secs
DHCPv6 Solicitation Timeout | 1 sec
DHCPv6 Request Timeout | 1 sec
LACP Initial Advertise Interval | 1 sec
LACP Advertise Interval | 30 secs
LACP Peer Timeout | 90 secs
PAgP Initial Advertise Interval | 1 sec
PAgP Advertise Interval | 30 secs
PAgP Peer Timeout | 90 secs
NTP Update Time | 5 min
IKE Peer Default Timer | 86400 sec
IPSec Peer default timer | 3600 sec
CBAC/Zone Based TcpSyn Wait time | 30 sec
CBAC/Zone Based TcpFin wait time | 5 sec
CBAC/Zone Based Tcp Idle time | 3600 sec
CBAC/Zone Based Udp Idle time | 30 sec
CBAC/Zone Based Dns Timeout | 5 sec
CBAC/Zone Based Icmp Timeout | 10 sec
Outside Nat Udp time out value | 300 sec
Outside Nat Tcp time out value | 86400 sec (24hr)
Outside Nat Icmp time out value | 60 sec
Outside Nat Standard time out value | 86400sec (24 hr)
SNMP Request Timeout | 10 sec
Voip Rtp keepAlive time | 15 sec
Voip Rtp keepAlive wait time | 90 sec
Voip Sccp keepAlive timer | 30 sec
Voip Sccp retry timer | 10 sec
PPPoE reset keepAlive time | 30 sec
PPPoE authentication failed timer | 10 sec
PPPoE keep alive timer | 10 sec
PPPoE linksys connect timer | 30 sec
PPPoE linksys timeout timer | 30 sec
BGP hold down timer | 180 sec
BGP connect retry timer | 60 sec
BGP keep alive timer | 60 sec