[rbridge] Proposed details for announcing endnodes

[Eastlake III Donald-LDE008]

(1) I don't see any point in discussing ARP now since the working group
has decided to move ARP and similar IP optimization out of the base
protocol draft to another document which does not yet even exist.

(2) The purpose of Rbridges is to do better than bridges. Arguments of
the form 'X is a known problem with bridges so we shouldn't solve it'
seem odd when the main premise of Rbridges is 'spanning tree is a known
problem with bridges so we WILL solve it'.

Donald

-----Original Message-----
From: rbridge-bounces at postel.org [mailto:rbridge-bounces at postel.org] On
Behalf Of Dinesh G Dutt
Sent: Tuesday, April 29, 2008 12:42 PM
To: Joe Touch
Cc: rbridge at postel.org; Radia Perlman
Subject: Re: [rbridge] Proposed details for announcing endnodes

Agree with Joe,

Dinesh
Joe Touch wrote:
>
>
> Radia Perlman wrote:
>> Yeah. Moving endnodes is always an issue. Even with bridges. The 
>> problem with having R1 (the one announcing that endnode E is
>> attached to R1) having a very short learning cache is that makes R1's

>> endnode announcement LSP information annoyingly volatile. The problem
>> with the learning
>> cache timer being long is that R1 can be a black hole, sucking 
>> traffic away from where E really is.
>>
>> There are some layer 2 protocols, I believe, with explicit 
>> registration and keep-alives. (anyone care to chime in about which 
>> protocols
>> these are?). Endnodes learned that way are good candidates for 
>> explicitly advertising.
>>
>> For attached IP endnodes, R1 could do something like, if it seems 
>> someone else advertise E, R1 could do an ARP to see if E is
>> still there. And there might be similar purely layer 2 "pings". (are 
>> there?)
>
> I do not believe rbridges should ever issue ARPs. Silent movement is a

> known problem with existing bridges; this is not an issue we should be

> solving.
>
> Joe
>
>
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