[f-nsp] Next SPF run wait

[Jörg Kost]

Hi,

this looks like an integer overflow and could be a bug. SPF will never 
run with  minus timer and I wonder which condition will trigger this.

What versions are your running?

I would start with
debug ospf  <spf, adj, bfd, error)
show cpu-utilization detail | include ospf
show ip os neighbor

and maybe try and set different timers and then restart the router?
E.g.
router ospf
timers throttle spf 5 1000 90000

Jörg


On 2 Aug 2017, at 16:06, Pave Lunin wrote:

> Hi,
>
>
>
> Any ideas, what "Next SPF run wait" actually means in the following 
> output? It is a large negative value which is increasing by absolute 
> value (will never reach zero).
>
>
>
> It looks like it never runs SFP as the box doesn't install new routes. 
> I see that it learns the LSAs but it never uses them as routes: show 
> ip routes / show ip ospf routes don't show theses routes, while I see 
> the corresponding LSAs in the OSPF DB. All the neighbor state 
> machinery works well. But active routes are never updated even if an 
> interfaces and a corresponding neighbor fail.
>
>
>
> SSH at CER#show ip ospf
>
> OSPF Version                  Version 2
>
> Router Id                     10.x.x.x
>
> ASBR Status                   No
>
> ABR Status                    No         (0)
>
> Redistribute Ext Routes from
>
> Initial SPF schedule delay    0          (msecs)
>
> Minimum hold time for SPFs    0          (msecs)
>
> Maximum hold time for SPFs    0          (msecs)
>
> **Next SPF run wait (msecs)     -177170950**
>
> External LSA Counter          0
>
> External LSA Checksum Sum     00000000
>
> Originate New LSA Counter     89
>
> Rx New LSA Counter            3260
>
> External LSA Limit            14447047
>
> Database Overflow Interval    0
>
> Database Overflow State :     NOT OVERFLOWED
>
> RFC 1583 Compatibility :      Enabled
>
> NSSA Translator:              Enabled
>
> Nonstop Routing:              Disabled
>
> Graceful Restart:             Disabled,   timer 120
>
> Graceful Restart Helper:      Enabled
>
> BFD:                          Enabled
>
>
>
>
>
> I checked other NetIron boxes (CERs and MLXes) but this line is just 
> not present in the output.
>
>
>
> We saw this behavior on another CERs, fixed this by a reboot. 
> Unfortunately I don't have "show ip ospf" before the reboot from those 
> boxes, now this line (Next SFP run wait) is just not present on the 
> rebooted boxes.
>
>
>
> Looks like a bug, but maybe I am missing something. Can't it be 
> something like SPF throttling and maybe there is a way to clear this 
> state less disruptively? On the other hand, "clear ip ospf all" did 
> not help yesterday.
>
>
>
>
>
> \--
>
> Kind regards,
>
> Pavel


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