3Com Switch 8800 Configuration Guide Chapter 19 OSPF Configuration
19-16
II. Setting a dead timer for the neighboring routers The dead timer of neighboring routers refers to the interval in which a router will regard
the neighboring router as dead if no Hello packet is received from it. The user can set a
dead timer for the neighboring routers.
Perform the following configuration in interface view.
Table 19-15 Set 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
By default, the dead interval for the neighboring routers of p2p or broadcast interfaces
is 40 seconds and that for the neighboring routers of p2mp or nbma interfaces is 120
seconds.
Note that both hello and dead timer will restore to the default values after the user
modify the network type.
III. Setting an interval for LSA retransmission between neighboring routers If a router transmits a Link State Advertisements (LSA) to the peer, it requires the
acknowledgement packet from the peer. If it does not receive the acknowledgement
packet within the retransmit time, it will retransmit this LSA to the neighbor. The value of
retransmit is user-configurable.
Perform the following configuration in interface view.
Table 19-16 Set 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
By default, the interval for neighboring routers to retransmit LSAs is 5 seconds.
The value of interval should be bigger than the roundtrip value of a packet.
Note that you should not set the LSA retransmission interval too small. Otherwise,
unnecessary retransmission will be caused.