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Re: [Isis-wg] [spring] carrying IPv6 and IPv4 packets using SPRING/SR with MPLS dataplane

"Stefano Previdi (sprevidi)" <sprevidi@cisco.com> Tue, 02 September 2014 15:21 UTC

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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: Chris Bowers <cbowers@juniper.net>
Thread-Topic: [spring] carrying IPv6 and IPv4 packets using SPRING/SR with MPLS dataplane
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Date: Tue, 02 Sep 2014 15:21:01 +0000
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Subject: Re: [Isis-wg] [spring] carrying IPv6 and IPv4 packets using SPRING/SR with MPLS dataplane
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Hi Chris,

On Sep 2, 2014, at 5:12 PM, Chris Bowers wrote:
> Has there been any discussion about how to carry both IPv6 and IPv4 packets with SPRING/SR MPLS labels?  From what I can tell, neither draft-filsfils-spring-segment-routing-04 nor draft-filsfils-spring-segment-routing-mpls-03 addresses this scenario.


sid's are assigned to ip addresses (e.g. intf addresses). A node having two loopbacks (v4/v6) will have a sid for the ipv4 address and another one for the ipv6.

Then you compute your spt's or explicit paths based on your af-topology and you pick the right sid's stack.

 
> In the context of shortest-path forwarding using Node-SID labels, there would seem to be two main approaches to consider.  One could distinguish between IPv6 and IPv4 packets by using two different Node-SID labels for the same node.


correct. this is same as above: one sid per address (one for v4 and one for v6).

s.


>  Or one could use IPv6 and/or IPv4 Explicit Null labels pushed on the bottom of the label stack by the SR ingress router.
>  
> Do the authors of these drafts or other working group participants have an opinion on the best way to address this scenario?
>  
> Thanks,
> Chris
>  
>  
>  
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