Re: [spring] Question about SRv6 Insert function

Fernando Gont <fernando@gont.com.ar> Sat, 31 August 2019 14:10 UTC

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To: li zhenqiang <li_zhenqiang@hotmail.com>, draft-voyer-6man-extension-header-insertion <draft-voyer-6man-extension-header-insertion@ietf.org>, draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>, "6man@ietf.org" <6man@ietf.org>, "spring@ietf.org" <spring@ietf.org>
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From: Fernando Gont <fernando@gont.com.ar>
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Subject: Re: [spring] Question about SRv6 Insert function
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Folks,

There was a very significant discussion during the IETF LC to make it
crystal clear that IPv6 EHs cannot be inserted. This is clearly codified
in RFC8200.

Are the two documents referenced bellow going against the RFC8200 standard?

Thanks,
Fernando




On 30/8/19 12:52, li zhenqiang wrote:
> Hello all,
> 
> End.B6.Insert specified in draft-ietf-spring-srv6-network-programming-01
> will insert a new SRH in the received IPv6 packet, which results in two
> SRHs in one IPv6 packet. It is contradict with RFC8200 that says Each
> extension header should occur at most once, except for the Destination
> Options header.
> 
> In draft-voyer-6man-extension-header-insertion-06, an intermediate node
> executes the insert function to implement a sub-50 milliseconds FRR
> operation upon link failure. It is contradict with RFC8200 that
> says Extension headers (except for the Hop-by-Hop Options header) are
> not processed, inserted, or deleted by any node along a packet’s
> delivery path, until the packet reaches the node (or each of the set of
> nodes, in the case of multicast) identified in the Destination Address
> field of the IPv6 header.
> 
> Best Regards,
> Zhenqiang Li
> ------------------------------------------------------------------------
> li_zhenqiang@hotmail.com
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Fernando Gont
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