3Com 3032 Configuration Manual page 435

Specifying the
Retransmitting Interval
Specifying the
Transmit-delay
Configuring a Stubby
Area and a Totally
Stubby Area
The router waits for confirmation from the neighbor to whom it has sent an LSA. If
the router does not receive the neighbor's confirmation after a specified interval,
the retransmitting interval, it resends the LSA. You can set the time interval for
re-transmitting an LSA.
Perform the following configurations in interface view.
Table 496 Specify Retransmitting Interval
Operation
Configure the interval of LSA
retransmission for the neighboring routers
Return to the default value of
re-transmitting interval
By default, the retransmitting interval is 5 seconds.
The retransmitting interval must be twice of the period when a message is
transmitted between two routers.
The interval for retransmitting an LSA between adjacent routers must not be so
small as to cause unnecessary retransmission.
The LSA ages in the link status database (LSDB) of the local router (1 is added per
second), but not during the process of network transmission. Therefore, it is
necessary to add the aging time before the transmission. Set and adjust this
parameter according to the actual situation in the low-speed network.
Perform the following configurations in interface view.
Table 497 Specify Transmit-delay
Operation
Set the delay time of LSA tramsmission
Return the default value of transmit-delay undo ospf trans-delay
By default, the time for transmit-delay is 1 second.
Usually, OSPF has 5 kinds of LSA packets, as follows:
Router-LSA: Generated by each router and transmitted to the whole area,
describing link status and cost of the router.
Network-LSA: Generated by the DR and transmitted to the whole area,
describing the link status of local network segment.
Net-Summary-LSA: Generated by the ABR and transmitted to relevant areas,
describing routing of certain network segment of the area.
Asbr-Summary-LSA: Generated by the ABR and transmitted to relevant area,
describing routing to ASBR.
AS-External-LSA: Generated by the ASBR and transmitted to the whole AS
(excluding the Stub area), describing routing to AS external.
A "stub area" is the area that does not advertise the received external LSA, inside
which the scale of the routing table and the quantity of the transmitted routing
Configuring OSPF
Command
ospf timer retransmit seconds
undo ospf timer retransmit
Command
ospf trans-delay seconds
431