Re: [PWE3] CW usage in opposite directions for static PWs

Stewart

My way of looking at it is different.

Are we sure that we want to rule out asymmetry ?

If we had BW reservation for PWs I would be sure that my answer would be no.

However, while I can't think of many concrete examples
(perhaps others on the list have some good ones)
I don't like ruling things out for no reason.

A wildly successful protocol (RFC 5+something) is one that can be used 
for cases that we didn't think about when we defined it.

Y(J)S

-----Original Message-----
From: pwe3-bounces@ietf.org [mailto:pwe3-bounces@ietf.org] On Behalf Of Stewart Bryant
Sent: Wednesday, April 11, 2012 12:55
To: Yaakov Stein
Cc: Lizhong Jin; pwe3@ietf.org
Subject: Re: [PWE3] CW usage in opposite directions for static PWs

Yaakov

Why not come at this from a different direction.

Is there an application which requires asymmetry?

Stewart

On 11/04/2012 08:50, Yaakov Stein wrote:
> Stewart
>
> Of course the PWE3 control protocol is clear in enforcing the use of non-use in both directions.
> Even there, I do not recall debate on the subject. It was "yeah, I guess that's OK".
>
> In my slide deck a few years back I discussed the state of affairs for other methods of setting up PWs
>
> I am OK with a decision to enforce the symmetry,
> but we need to discuss this and agree on it.
> And perhaps there are other parameters that need similar discussion.
> For example, can I set up a TDM PW with an E1 in one direction and a T1 in the other ?
> What about a raw Ethernet PW in one direction and a tagged one in the opposite direction ?
>
> If this is a general principle (as I suspect many people believe, but I don't recall was ever explicitly stated)
> then this should be written up (and the implications considered).
>
> Y(J)S
>
>
> -----Original Message-----
> From: pwe3-bounces@ietf.org [mailto:pwe3-bounces@ietf.org] On Behalf Of Stewart Bryant
> Sent: Tuesday, April 10, 2012 19:14
> To: Andrew G. Malis
> Cc: Lizhong Jin; pwe3@ietf.org; Yaakov Stein
> Subject: Re: [PWE3] CW usage in opposite directions for static PWs
>
> On 10/04/2012 17:08, Andrew G. Malis wrote:
>> All,
>>
>> This has been an extremely useful discussion.
>>
>> <wg chair hat off>
>>
>> Personally, I don't really see much utility in asymmetric CWs in a PW.
>>
>> <wg chair hat on>
>>
>> Once the WG comes to consensus on the issue one way or the other (and
>> I would like to hear some more opinions), we should consider document
>> revisions as necessary to make sure that the consensus is clearly
>> reflected in the RFCs.
>>
>> Cheers,
>> Andy
> For LDP signaled PWs, I don't think there is any ambiguity, the CW
> handling is symmetric. Does anyone read it any other way?
>
> Stewart
>
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