138 CHAPTER 6: IP ROUTING PROTOCOL OPERATION
Perform the following configuration in Interface View
By default, P2P and broadcast interfaces send Hello packets every 10 seconds, and
P2MP and NBMA interfaces send Hello packets every 30 seconds.
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.
Table 139 Setting Hello Timer and Poll Interval
Operation Command
Set the hello interval of the interface ospf timer hello
seconds
Restore the default hello of the interface undo ospf timer hello
Set the poll interval on the NBMA interface ospf timer poll
seconds
Restore the default poll interval undo ospf timer poll
Table 140 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 141 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
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