3Com Switch 7700 Configuration Manual page 121

Table 32 Setting a Dead Timer for the Neighboring Routers
Operation
Restore the default dead interval of the
neighboring routers
By default, the dead interval for the neighboring routers of P2P or broadcast
interfaces is 40 seconds and for the neighboring routers of P2MP or NBMA
interfaces is 120 seconds.
Both hello and dead timers restore the default values if you modify the network
type.
Configuring an Interval Required for Sending LSU Packets
Trans-delay seconds should be added to the aging time of the LSA in an LSU
packet. Setting the parameter like this, the time duration that the interface
requires for transmitting the packet, is considered.
You can configure the interval for sending LSU messages. More attention should
be paid to this item on low speed networks.
Perform the following configuration in VLAN interface view.
Table 33 Configuring an Interval for LSU packets
Operation
Configure an interval for sending LSU packets ospf trans-delay seconds
Restore the default interval of sending LSU
packets
By default, LSU packets are transmitted by seconds.
Setting an Interval for LSA Retransmission Between Neighboring Routers
If a router transmits an LSA to the peer, it requires the acknowledgement packet
from the peer. If it does not receive the acknowledgement packet within the
retransmission, it retransmits this LSA to the neighbor. You can configure the value
of the retransmission interval.
Perform the following configuration in VLAN interface view.
Table 34 Setting Retransmit Timer
Operation
Configure the interval of LSA retransmission
for the neighboring routers
Restore the default LSA retransmission interval
for the neighboring routers
By default, the interval for neighboring routers to retransmit LSAs is five seconds.
The value of the interval should be bigger than the interval in which a packet can
be transmitted and returned between two routers.
An LSA retransmission interval that is too small will cause unnecessary
retransmission.
Command
undo ospf timer dead
Command
undo ospf trans-delay
Command
ospf timer retransmit interval
undo ospf timer retransmit
OSPF 113