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Re: [Bier] BIER WG adoption of https://datatracker.ietf.org/doc/draft-zzhang-bier-php/

IJsbrand Wijnands <ice@cisco.com> Wed, 10 October 2018 13:08 UTC

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From: IJsbrand Wijnands <ice@cisco.com>
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Date: Wed, 10 Oct 2018 15:08:52 +0200
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To: Antoni Przygienda <prz@juniper.net>
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Subject: Re: [Bier] BIER WG adoption of https://datatracker.ietf.org/doc/draft-zzhang-bier-php/
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Dear WG,

This is an interesting area, but for me there is clarification needed to support this draft as a WG document.

* When doing PHP, the BIER header is removed. That also removes the Context (for the upstream Label) of the packet, that is required to map it to the correct VPN or application. To me it sounds like this proposal does not work for MVPN and EVPN, but only global table Multicast. I assume that when a upstream assigned label is at the bottom of the BIER header, the BIER header is removed, and the Upstream label is left in place. How does the egress router know this label is upstream or downstream? By adding a global unique downstream Label into the Upstream label space you can probably solve that, but it needs to be documented this is a restriction.

* When there is no Upstream label below the BIER header, the Multicast packet is sent natively to the egress PE. How will the egress PE do the RPF check in order to accept the packet?

* This draft does require an upgraded software version of the Egress router in order to signal PHP, right? 

Thx,

Ice.

> On 3 Oct 2018, at 23:39, Antoni Przygienda <prz@juniper.net> wrote:
> 
> Based on consensus/request during IETF 102 this thread starts adoption request for https://datatracker.ietf.org/doc/draft-zzhang-bier-php/
>  
> Please voice support/dissent/comments …
>  
> --- tony
>  
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