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Re: [bess] Comments on draft-dawra-idr-srv6-vpn-03

Eric C Rosen <erosen@juniper.net> Thu, 28 December 2017 18:11 UTC

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To: Robert Raszuk <robert@raszuk.net>
Cc: "bess@ietf.org" <bess@ietf.org>, draft-dawra-idr-srv6-vpn.authors@ietf.org, spring@ietf.org
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From: Eric C Rosen <erosen@juniper.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/2bxzChumY91yoGzjoujAqTo4DM8>
Subject: Re: [bess] Comments on draft-dawra-idr-srv6-vpn-03
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On 12/28/2017 12:14 PM, Robert Raszuk wrote:
> Hi Eric,
>
> A lot of your comments are an indication that you treat SID to be IPv6 
> address fully responsible for demux to proper VRF or CE. This was 
> never the intention.
>
> Imagine egress PE having /64 loopback. Then you have remaining 64 bits 
> to put there a 20 bit VPN label (as we know it :) and even much more 
> then that. You can attach new arbitrary new functions to this single 
> "VPN SID".
>
> And further notice that this has no bearing on SID being routable or 
> not. Only the first /64 bits of the dst address need to be routable in 
> order for forwarding packets to happen ... So by no means there should 
> be a case to have per vrf IPv6 address or per CE IPv6 address and make 
> it fully /128 routable.

I'm not sure what you mean by "fully /128 routable".  If there is a 
route for a /64 prefix, then a /128 that begins with that prefix is 
routable.

I'm not sure what you mean by saying it is "not the intention for the 
IPv6 address to be fully responsible for demux to proper VRF or CE".  If 
the IPv6 adress contains the "VPN label" in its low-order part, then the 
IPv6 address is used for the demux.  The VPN label is part of the IPv6 
address, no?

I'm not sure which comments you consider to be invalid.

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