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).
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