Re: [Idr] draft-jakma-mrai-dep-00 (fwd)

On Nov 25, 2008, at 8:20 PM, Jeffrey Haas wrote:

> Yakov,
>
> On Tue, Nov 25, 2008 at 05:40:33PM -0800, Yakov Rekhter wrote:
>> With my WG chair hat off, I think the document more or less satisfies
>> the requirements. The only two change I would suggest to make are  
>> (a) to
>> eliminate a special case for Withdrawn Routes (this is based on
>> some discussion that happened few years ago initiated by Pedro  
>> Marques),
>
> By this, do you mean you don't believe that MRAI should be separately
> configurable for reachability and unreachability?

The rational for not treating them differently is that a single event  
as it propagates through the network gets expressed as both  
reachability and withdrawal information.

The typical example being an SP that acquires a newly preferred peer  
route which them causes it to send withdrawals to other peers  
(reachable converts to unreachable).

My understanding is that this behavior has been well document in  
practical observations of BGP convergence.

In general my recommendation for MRAI values would be 0 for eBGP and 0  
for iBGP. As the draft correctly explains calculating a value that  
best fits the network is a very tricky business.

regards,
   Pedro.
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