Concept Guide

Conguring LSA Throttling Timers
Congured LSA timers replace the standard transmit and acceptance times for LSAs.
The LSA throttling timers are congured 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.
1 Specify the interval times for all LSA transmissions.
CONFIG-ROUTEROSPF- id mode
timers throttle lsa all {start-interval | hold-interval | max-interval}
• start-interval: set the minimum interval between the initial sending and resending the same LSA. The range is from 0 to
600,000 milliseconds.
• hold-interval: set the next interval to send the same LSA. This interval is the time between sending the same LSA after the
start-interval has been attempted. The range is from 1 to 600,000 milliseconds.
• max-interval: set the maximum amount of time the system waits before sending the LSA. The range is from 1 to 600,000
milliseconds.
2 Specify the interval for LSA acceptance.
CONFIG-ROUTEROSPF- id mode
timers throttle lsa arrival arrival-time
• arrival-time: set the interval between receiving the same LSA repeatedly, to allow sucient time for the system to accept
the LSA. The range is from 0 to 600,000 milliseconds.
Enabling 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 does not send or receive routing
updates, the network on that interface is still included in OSPF updates sent via other interfaces.
To suppress the interface’s participation on an OSPF interface, use the following command. This command stops the router from sending
updates on that interface.
• Specify whether all or some of the interfaces are passive.
CONFIG-ROUTEROSPF- id mode
passive-interface {default | interface}
The default is enabled passive interfaces on ALL interfaces in the OSPF process.
Entering the physical interface type, slot, and number enables passive interface on only the identied interface.
– For a port channel, enter the keywords port-channel then a number from 1 to 128.
– For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information (for example,
passive-interface ten 2/3).
– For a VLAN, enter the keyword vlan then a number from 1 to 4094 (for example, passive-interface vlan 2222).
The keyword default sets all interfaces on this OSPF process as passive.
To remove the passive interface from select interfaces, use the no passive-interface interface command while passive
interface default
is congured.
To enable both receiving and sending routing updates, use the no passive-interface interface command.
Open Shortest Path First (OSPFv2 and OSPFv3)
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