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Re: [mpls] [Technical Errata Reported] RFC3107 (4499)

Eric C Rosen <erosen@juniper.net> Mon, 19 October 2015 17:46 UTC

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To: Alexander Okonnikov <alexander.okonnikov@gmail.com>, RFC Errata System <rfc-editor@rfc-editor.org>, akatlas@gmail.com, db3546@att.com, aretana@cisco.com, loa@pi.nu, swallow@cisco.com, rcallon@juniper.net
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From: Eric C Rosen <erosen@juniper.net>
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Subject: Re: [mpls] [Technical Errata Reported] RFC3107 (4499)
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On 10/16/2015 4:40 PM, Alexander Okonnikov wrote:
> Good. I know that at least three major vendors interwork correctly. One
> of them use 0x800000, and two others - 0x000000. No problems with
> interoperability were noticed.

Probably no one pays much attention to the label value in the Withdraw, 
because no one implements the capability to advertise multiple routes 
with the same prefix but different labels.

> By the way, it is not clear for me why don't encode label
> from previously advertised route when this one is being withdrawn.

If you only advertise one label per prefix, there's no real need to 
specify that label in the withdraw.  I think one of the implementers 
said that it would be easier if you didn't have to specify the label. 
But I'm pretty sure that there's no one who still remembers what the 
reasoning actually was at the time ;-)

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