Re: RFC 4286 - AdvertisementJitter

Daniel Joyal wrote:
>  See below.
> -Dan
> 
>> -----Original Message-----
>> From: Brian Haberman [mailto:[email protected]] 
>> Sent: Tuesday, March 27, 2007 3:06 PM
>> To: Joyal, Daniel (BL60:SF23)
>> Cc: [email protected]
>> Subject: Re: [magma] RFC 4286 - AdvertisementJitter
>>
>>
>>
>> Daniel Joyal wrote:
>>>       Hi,
>>>
>>>       Section 3.1.2 of RFC 4286 reads
>>>
>>>       3.1.2.  AdvertisementJitter
>>>
>>>          This is the maximum time (in seconds) by which the
>>>          AdvertisementInterval is perturbed for each unsolicited
>>>          Advertisement.  Note that the purpose of this 
>> jitter is to avoid
>>>          synchronization of multiple routers on a network, 
>> hence choosing a
>>>          value of zero is discouraged.  This value MUST be 
>> an integer no
>>>       less
>>>          than 0 seconds and no greater than AdvertisementInterval.
>>>
>>>          The AdvertisementJitter MUST be  
>> 0.025*AdvertisementInterval
>>>       I'm assuming that the last sentence above is referring to the
>>>       default AdvertisementJitter.
>>>       Am I correct?
>> If you are referring to the "This value", then it is 
>> referring to the AdvertisementJitter variable.
>>
> 
> Sorry that I wasn't clear about my question. What I wanted to know
> is whether this sentence
> 
> 	The AdvertisementJitter MUST be 0.025*AdvertisementInterval
> 
> refers to the default AdvertisementJitter value. I'm assuming it
> does, but just wanted to be sure since the term "default" is not
> used in the sentence.

There is no default value for AdvertisementJitter.  See the errata at
http://www.rfc-editor.org/cgi-bin/errataSearch.pl?rfc=4286.  The value
is strictly calculated and not independently configurable.

Regards,
Brian