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Home > Archive > CCIE > June 2003 > OSPF questions
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| hello everyone,Say a router running OSPF,and there are others in the area.The problem is,the router must be powered off in the evening and powered on in the next morning,I think it must will cause too many meaningless LSAs in the area and make other routers calculate SPF too frequently,is there a way to stop this? | |
| devecchio 2003-06-10, 12:06 am |
| depends on the status of the router. if it is a drother and you ABR is configured for summary routes then who cares. If your concern if for LSAs in your area then you must weigh the options. I don't think powering off a rounter once a day will stop your network. Why must the router be powered off? | |
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| What is the size of your network anyway? If it is less than 15 routers, I won't worry about that at all. If you are still that concerned, check my suggestions below, I would imagine a network with less than 15 routers to have max of 3 areas or something, if not even one area.
Put this router in an area by itself if possible and configure it as a stub or totally stubby area (if Cisco).
If not possible, then, try to configure the area the router is connected to as a stub area.
If it is configured in the backbone area, then, you will have to put it in another area, preferably a new one by itself. | |
| Carl_Docklands 2003-06-18, 8:30 am |
| Mosam,
Would tweaking the SPF timers also help in this situation?
EG.
router OSPF 100
timer spf 10 20
Shamelessly ripped from the CCIE book i am reading but this seems like a good real world example where it may be of help ??  | |
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| Well, mm, it may help a little.. I think this can help too, but not with the values you have mentioned..
Default delay is 5 sec and default hold time is 10 seconds I think. So, you only doubled both values..
The main problem is not too many flapping. If this is the case, I would say "timer spf" would be a great solution.
So, playing with the timer will only delay the update, hence may create other problems. There is no meaning to have timer in seconds in this situation, and if you increase the timer in like 30 minutes or something, this may delay the spf calculations for 30 minutes, causing another latency in your network that you really don't need.
To tell u the truth, I don't see it a problem at all if he powers it on then leave it for hours then powers it off. There shouldn't be any problem at all, but just for design sake, it would be a good idea to have the area this router connected to, to be a stub area, this will eliminat the LSA flooding each time he powers it on. But in any case even if LSAs are flooded each 8 hours in a network with, lets say 15 routers.. I don't see it of any big deal at all. |
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