372 | Open Shortest Path First (OSPFv2)
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To view which LSAs are transmitted, use the show ip ospf database process-id database-summary command
syntax in EXEC Privilege mode (Figure 20-12).
Figure 20-12. show ip ospf process-id database database-summary Command Example
To view information on areas, use the show ip ospf process-id command in EXEC Privilege mode.
Configure LSA Throttling Timers
Configured LSA timers replace the standard transmit and acceptance times for LSAs. Configure LSA
throttling timers in milliseconds, with the interval time increasing exponentially until a maximum time has
been reached. If the maximum time is reached, the system continues to transmit at the max-interval. If the
system is stable for twice the maximum interval time, the system reverts to the start-interval timer and the
cycle begins again. To configure the LSA throttling timers, use the commands below.
Enable Passive Interfaces
A passive interface is one that does not send or receive routing information. Enabling passive interface
suppresses routing updates on an interface. Although the passive interface will neither send nor receive
routing updates, the network on that interface is still included in OSPF updates sent using other interfaces.
Command Syntax Command Mode Usage
timers throttle lsa all
{start-interval | hold-interval |
max-interval}
CONFIG-ROUTER-OSPF-id Specify the interval times for all LSA transmissions
• start-interval: Set the minimum interval between
initial sending and resending the same LSA.
Range: 0-600,000 milliseconds
• hold-interval: Set the next interval to send the
same LSA. This is the time between sending the
same LSA after the start-interval has been
attempted.
Range: 1-600,000 milliseconds
• max-interval: Set the maximum amount of time
the system waits before sending the LSA.
Range: 1-600,000 milliseconds
timers throttle lsa arrival
arrival-time
CONFIG-ROUTER-OSPF-id
Specify the interval for LSA acceptance.
• arrival-time: Set the interval between receiving
the same LSA repeatedly, to allow sufficient
time for the system to accept the LSA.
Range: 0-600,000 milliseconds
FTOS#show ip ospf 34 database database-summary
OSPF Router with ID (10.1.2.100) (Process ID 34)
Area ID Router Network S-Net S-ASBR Type-7 Subtotal
2.2.2.2 1 0 0 0 0 1
3.3.3.3 1 0 0 0 0 1
FTOS#
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