show ip ospf interface command for a specific VLAN with passive configured on an interface
switch(config) show ip ospf interface vlan 4
OSPF configuration and statistics for VLAN 4
OSPF Interface Status for 10.10.10.1
IP Address: : 10.10.10.1 Status : enabled
AreaID : 0.0.0.2 Passive : Yes
State : DOWN Auth-type : none
Cost : 1 Chain :
Type : BCAST Priority : 1
Transit Delay : 1 Retrans Interval : 5
Hello Interval : 10 Rtr Dead Interval : 40
Designated Router: Events : 0
Backup Desig. Rtr: Passive : yes
Neighbors : 2
Configuring the calculation interval
Syntax:
[no] spf-throttle start-interval [1-600] wait interval [1-600] max-wait-time [1-600]
Enables and configures SPF scheduling (throttling.) This delays SPF calculations during periods of network
topology changes.
SPF calculations occur at the interval set by the
spf-throttle
command. This command is executed in ospf
context.
Default: 5 seconds
start-interval [1–600]
Specifies the initial SPF schedule delay in seconds.
wait-interval [1–600]
specifies the amount of time to wait until the next SPF calculation occurs, in seconds.
max-wait-time [1–600]
Specifies the maximum time between two consecutive SPF calculations, in seconds.
The current SPF interval is calculated; it will be twice as long as the previous interval until this value reaches the
maximum-wait-time specified.
Example
SPF throttling configuration
The last SPF calculation was scheduled and triggered at the 100th second. A new topology event occurred at the
104th second. The configured values are:
•
start-interval
= 3 seconds
•
wait-interval
Chapter 11 Open Shortest Path First Protocol (OSPF)
221
