flash-update-threshold??

[Cielieska Nathan <ncielieska@xxxxxxxxx>]

All,

I have been working through the Command Reference for RIP today and  
ran into this command. The way i'm reading it (disclaimer) is that  
when a router running rip v2 unequivocally knows that an advertised  
route is down... or has been added, it shoots a flash update across  
to its neighbor notifying them as such thus allowing for faster  
update time. Thats how i understand it to work.

Now the flash-update-threshold has a second value that compares  
itself with the incoming regular 30 second update. You can suppress  
an outgoing flash update by configuring this command with a seconds  
value that will match that 30 second timer.

If the timer is greater than the threshold value: flash update is  
sent. If the update packet is within the timer,flash update is  
suppressed.

For instance:

On the receiving end of a route change or event

router rip
 flash-update-threshold 20

When a flash-update came into the router on a particular interface,  
the value in the show ip protocols would be referenced.. if its above  
20 the flash update is sent, if its under 20.. its suppressed.

Is this correct? Cant find a ton of documentation on the command. I  
labbed it up and if i remove/add a network command from R1 it shoots  
the flash update to R2. R2 flash-update-threshold 30 configured which  
would allow all flash updates to be suppressed. Yet in "debug ip rip"  
i still see flash updates being sent out my other interfaces on R2.

Any help would be great.

Regards,
Nate