Re: [Idr] AD Review of draft-ietf-idr-bgp-extended-messages-20

Enke Chen <enkechen@cisco.com> Tue, 07 March 2017 23:49 UTC

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From: Enke Chen <enkechen@cisco.com>
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Date: Tue, 7 Mar 2017 15:49:17 -0800
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Cc: 'idr wg' <idr@ietf.org>, 'Robert Raszuk' <robert@raszuk.net>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "draft-ietf-idr-bgp-extended-messages@ietf.org" <draft-ietf-idr-bgp-extended-messages@ietf.org>, Susan Hares <shares@ndzh.com>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-extended-messages-20
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Please check out the following document:

Extended Optional Parameters Length for BGP OPEN Message
draft-ietf-idr-ext-opt-param-02

-- Enke

On 3/7/17 3:44 PM, Borchert, Oliver (Fed) wrote:
> I am wondering – according to RFC 4271, how can an OPEN message ever exceed 284 bytes?
> The bgp message header has 19 bytes and the OPEN message payload adds 10. This is 29, then the only 
> addition here are the Optional Parameters which cannot exceed 255 bytes combined due to the 1 byte length field.
> 
> Therefore, an open message cannot exceed 284 bytes and if larger than 284 bytes, wouldn’t it be invalid. 
> 
> In this regard, I don’t really understand the whole discussion about allowing an OPEN message larger than 4K. 
> It shouldn’t even be larger than 284 bytes?  Maybe I am missing something.
> 
> BTW, same is true for KEEPALIVE (max 19 bytes)
> 
> Oliver
> 
> 
> 
> On 3/7/17, 1:45 PM, "Idr on behalf of Enke Chen" <idr-bounces@ietf.org on behalf of enkechen@cisco.com>; wrote:
> 
>     Hi, Folks:
>     
>     o There is no extra work for a receiver to cover message types other than UPDATE.
>     o There is a little bit work for a sender that wishes to send a large OPEN (e.g.,
>       using the prior capability and possibly subsequent NOTIFICATION).
>     
>     Additionally, I do not see a need to touch on the FSM specified in RFC 4271 even
>     in the case of sending a large OPEN, which potentially may involve two separate
>     consecutive sessions but each session would just follow the existing FSM.
>     
>     Thanks.   -- Enke
>     
>     On 3/7/17 7:32 AM, Susan Hares wrote:
>     > Robert:
>     > 
>     > <individual contributor’s hat on>
>     > 
>     > Yep  - Easier to just include all messages.  
>     > 
>     >  
>     > 
>     > Sue
>     > 
>     >  
>     > 
>     > *From:*rraszuk@gmail.com [mailto:rraszuk@gmail.com] *On Behalf Of *Robert Raszuk
>     > *Sent:* Tuesday, March 7, 2017 10:33 AM
>     > *To:* Susan Hares
>     > *Cc:* Randy Bush; Enke Chen; Jeffrey Haas; Alvaro Retana (aretana); idr-chairs@ietf.org; draft-ietf-idr-bgp-extended-messages@ietf.org; idr wg
>     > *Subject:* Re: [Idr] AD Review of draft-ietf-idr-bgp-extended-messages-20
>     > 
>     >  
>     > 
>     > Hi Sue,
>     > 
>     >  
>     > 
>     >> My suggestion is to include all messages including future messages if approved.  
>     > 
>     >  
>     > 
>     > Ahh then it is great - we are in sync ! 
>     > 
>     >  
>     > 
>     > My other comments were just an opinion ... but if it is easier to extend all messages then perfect. 
>     > 
>     >  
>     > 
>     > Cheers,
>     > 
>     > R.
>     > 
>     >  
>     > 
>     >  
>     > 
>     
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