Time Constants


Packet Tracer 4.11 uses the following time constants:

RIP default update

30 sec

RIP default timeout

3 min

RIP default flush timeout 4 min
RIP default hold-down 3 min
   
MAC table entry timeout 5 min
   
ARP request timer 2 sec
ARP table entry timeout 4 hrs
   
CDP update timer 1 min
CDP neighbor hold-down timer 3 min
   
DHCP client timeout 5 sec
   
CSMA/CD waiting time to resend random
   
LMI timeout 15 sec
LMI signaling 5 sec
Inverse ARP 30 sec
   
HDLC keepalive 5 sec
HDLC timeout 15 sec
   
NAT entries timeout Depends on the encapsulation protocol
NAT entry encapsulated in a UDP 5 min
NAT entry encapsulated in a TCP 24 hrs
NAT entry encapsulated in a IC 1 min
   
CHAP timeout 5 sec
CHAP re-authenticate timeout 10 sec
   
DIALING no answer timeout 5 sec
DIALING no dial tone timeout 2 sec
   
PPP keepalive interval 5 sec
Timeout 15 sec
   
EIGRP Hello time interval period 5 sec
EIGRP Hold time interval period 15 sec
   
ICMP 1 ms
   
STP Max Age 20 sec
STP Hello 2 sec
STP Forward Delay 15 sec
STP Topology Change Notify Timer 2 sec
STP Topology Change Timer 35 sec
   
OSPF SPF Hold Time 10 sec
OSPF LS Refresh Time 30 min
OSPF SPF Delay Timer 5 sec
OSPF LSA Retransmission Time 5 sec
OSPF minimum LSA Arrival Time 1 sec
OSPF Delayed Acknowledgment Timer 2.5 sec
OSPF Dead Interval 40 sec
OSPF Hello 10 sec
OSPF Wait Interval 40 sec
   
TCP Connection Timeout 60 sec
TCP Retransmission Timeout 0.1 sec
TCP Inactivity Timeout 5 min
TCP Close Timeout 10 sec
   
DNS Request Timeout 3 sec
   
DHCP Timeout 5 sec
DHCP Discovery Timeout 55 sec
   
DTP Hello 30 sec
DTP Timeout 5 min
   
Password Timeout 30 sec