Re: [pim] [bess] WGLC: draft-ietf-bier-mvpn-05

Eric C Rosen <erosen@juniper.net> Wed, 21 June 2017 20:51 UTC

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From: Eric C Rosen <erosen@juniper.net>
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Date: Wed, 21 Jun 2017 16:51:34 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pim/YneFtQ-sj2tX7mGxaAfiRaCuC6g>
Subject: Re: [pim] [bess] WGLC: draft-ietf-bier-mvpn-05
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On 6/21/2017 4:15 PM, Swadesh Agrawal (swaagraw) wrote:
> I think it’s pretty standard to send ipv6 traffic with ipv6 explicit NULL.

I wouldn't make that assumption.  Especially not in MPLS backbones built 
on an IPv6 infrastructure.

> It was never required to be explicitly mention in RFC.

The fact that this was never made explicit in any RFC has been the cause 
of numerous interoperability problems.  Many of these have been hammered 
down over the past twenty years, but new issues of this sort still 
arise, especially in new applications where label stacks are signaled in 
new and different ways.

> We won’t need signaling. It will depend on ingress PE. If ingress PE does not send ipv6 explicit NULL, it should announce different upstream assigned label for afi.
> Egress PE should work in both scenario without any signaling of what ingress PE has implemented.

I think it would be good for the egress PE to know in advance whether or 
not it is expected to infer the payload type from the upstream-assigned 
label (assuming that that label appears at the bottom of the stack).