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OSPF Configuration 243
Setting a Dead Timer for the Neighboring Routers
If hello packets are not received from a neighboring router, that router is considered
dead. The dead timer of neighboring routers refers to the interval after which a router
considers a neighboring router dead. You can set a dead timer for the neighboring
routers.
Perform the following configuration in Interface View:
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 to 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.
This parameter affects the time duration that the interface requires to transmit the
packet.
You can configure the interval for sending LSU messages. This is more important on
low speed networks.
Perform the following configuration in Interface View
By default, the LSU packets are transmitted every second.
Setting an Interval for LSA Retransmission between Neighboring Routers
If a router transmits an LSA (Link State Advertisements) to the peer, it requires an
acknowledgement packet from the peer. If it does not receive the acknowledgement
packet within the retransmit time, it retransmits this LSA to the neighbor. You can
configure the value of the retransmission interval.
Perform the following configuration in Interface View
By default, the interval for neighboring routers to retransmit LSAs is five seconds.
Table 230 Setting a Dead Timer for the Neighboring Routers
Operation Command
Configure a dead timer for the neighboring routers ospf timer dead seconds
Restore the default dead interval of the neighboring routers undo ospf timer dead
Table 231 Configuring an Interval for LSU packets
Operation Command
Configure an interval for sending LSU packets ospf trans-delay seconds
Restore the default interval of sending LSU packets undo ospf trans-delay
Table 232 Setting an Interval for LSA Retransmission between Neighboring Routers
Operation Command
Configure the interval of LSA retransmission for
the neighboring routers
ospf timer retransmit interval
Restore the default LSA retransmission interval
for the neighboring routers
undo ospf timer retransmit