[OLSR-users] Problem with droptime

[Felix Nattermann]

I use the same olsrd.conf on all 3 nodes. I tried a lot of configurations 
with a
hello_interval from 1.0 to 0.1 seconds. I also changed the tc_interval. The
time to find a new route is between 9 and 16 seconds. (And I change only
between a direct link and a 1-hop-link on an 100Mbit-Ethernet)

I don't use the GUI. I set the hysteries to "no" and LQ=0 (not used). The
changes are reflected on the startup output correctly.

What times to find a new route can I expect in such a szenario? By the way
if I use a Hello_interval with 0.1 the new route is unstable. (some 
test-pings
were dropped)

Felix


> Hi,
>
> Are you saying that changing intervals has no effect on olsrd operation?
> Try using HELLO intervals of 0.5 seconds(and validity time of 1.5 secs) -
> is there no change in olsrd behaviour? If so I would suspect a
> configuration problem. Are the changes reflected in the olsrd startup
> output(emission intervals)?
> BTW are you using LQ, hysteresis or neither?
>
> - Andreas
>
>>
>> ----- Original Message -----
>> From: "lolo" <(spam-protected)>
>> To: "OLSR discussion and development" <(spam-protected)>
>> Sent: Monday, March 14, 2005 10:56 AM
>> Subject: Re: [OLSR-users] Problem with droptime
>>
>>
>>> Hello Felix
>>>
>>> OLSR is not very fast at detecting/reestablishing broken roads, so maybe
>>> are you hitting the limits of it ?
>> 10 sec to create a new route in a very simple topology? I hope that it
>> isn't
>> the limit
>>>
>>> Maybe you could give us more information about your topology and the
>>> time
>>> evolution of it in order
>>> to check if the timeouts fell inside "theorical" ranges
>>
>> Topology:
>>
>> There are only 3 Nodes (A, B and C). First there is a direct link from A
>> to
>> C
>>
>> A ----- C                    and everythinks goes right.
>>   \       /
>>    \    /
>>      B
>>
>> After 5 seconds I change the topology (with iptables) to:
>>
>> A --------- B -------- C            so that there is no direct link
>> between
>> A and C.
>>
>> After 5 seconds the topology will change back. But the 5 sec are not
>> enougth
>> that OLSR can create a new route. So I wait for 10 to 15 sec until the 
>> new
>> route
>> is created. So I change in the config file the hello_interval and the
>> tc_intervall but
>> nothing realy happens.
>>
>> Felix
>>
>>>
>>> Laurent
>>>
>>> Felix Nattermann wrote:
>>>> Hello
>>>> I've got a question. I use OLSR 0.4.8 and use it in an ethernet. I
>>>> emulate a WLAN with iptables over this ethernet. Now I try to use Voice
>>>> over IP over this MANET. There is one big problem. Changes in the
>>>> topology of the MANET costs a lot of time until the new route is
>>>> created.
>>>> (Up to 15 sec.) I try to change the TC_interval and the Hello_interval,
>>>> but nothing happens. All pakets are dropped until (after ca. 10 sec)
>>>> the
>>>> new route is set.
>>>>
>>>> How can I make OLSR 0.4.8 faster, so that there aren't so many
>>>> paket-drops?
>>>>
>>>
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>>
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>
>
> ---------
> Andreas Tønnesen
> http://www.olsr.org
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