H3C S9500 Series Operation Manual page 259

Operation Manual – Routing Protocol
H3C S9500 Series Routing Switches
According to RFC2328, the consistency of Hello intervals between network neighbors
should be kept. The Hello interval value is in inverse proportion to the route
convergence rate and network load.
Perform the following configuration in interface view.
Table 4-17 Set the Hello interval
Set the hello interval of the interface
Restore the default hello interval of the interface
Set the poll interval on the NBMA interface
Restore the default poll interval
By default, p2p and broadcast interfaces send Hello packets every 10 seconds, and
p2mp and nbma interfaces send Hello packets every 30 seconds.
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 4-18 Set a dead timer for the neighboring routers
Configure a dead timer for the neighboring routers
Restore
neighboring routers
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.
Operation
Operation
the default dead
ospf timer hello seconds
undo ospf timer hello
ospf timer poll seconds
undo ospf timer poll
ospf timer dead seconds
interval of the
undo ospf timer dead
4-17
Chapter 4 OSPF Configuration
Command
Command