RE: draft-dong-6man-enhanced-vpn-vtn-id-01

["Dongjie (Jimmy)" <[e-mail]>]

Hi Joel, 

As explained in my previous mail, the role of DSCP and VTN-ID are different. VTN-ID can be used as a in packet identifier of the VTN, and it can be used in a hierarchical manner with DSCP and other fields for packet forwarding. Thus it is not to extend or replace DSCP.

Best regards,
Jie

> -----Original Message-----
> From: Joel M. Halpern [mailto:[e-mail]]
> Sent: Wednesday, July 29, 2020 9:40 PM
> To: Dongjie (Jimmy) <[e-mail]>; [e-mail]
> Subject: Re: draft-dong-6man-enhanced-vpn-vtn-id-01
> 
> It is unclear to me whether you are asserting that DSCP is insufficiently
> granular to represent the desired treatment, or whether youa re asking for
> an in-packet identifier that does not affect packet queueing or forwarding?
> 
> Yours,
> Joel
> 
> On 7/29/2020 3:43 AM, Dongjie (Jimmy) wrote:
> > Hi Ron,
> >
> > Thanks for your review and comment.
> >
> > Your interpretation is in the right direction, while the relationship
> > between VTN-ID and DSCP could be considered as in a hierarchical
> > manner, and each is for different purpose. VTN-ID is used to
> > consistently identify a virtual network with a group of network
> > resources allocated from the network, there is no priority difference
> > between VTNs. DSCP is used to provide class (priority) based traffic
> > differentiation, which can be used within VTN.
> >
> > Hope this helps.
> >
> > Best regards,
> >
> > Jie
> >
> > *From:*ipv6 [mailto:[e-mail]] *On Behalf Of *Ron Bonica
> > *Sent:* Wednesday, July 29, 2020 1:45 AM
> > *To:* [e-mail]
> > *Subject:* draft-dong-6man-enhanced-vpn-vtn-id-01
> >
> > Co-authors,
> >
> > In Section 4.2, you say:
> >
> > "There can be different implementations of reserving local network
> >
> >     resources to the VTNs.  On each interface, the resources allocated
> > to
> >
> >     a particular VTN can be seen as a virtual sub-interface with
> >
> >     dedicated bandwidth and other associated resources.  In packet
> >
> >     forwarding, the IPv6 destination address of the received packet is
> >
> >     used to identify the next-hop and the outgoing interface, and the
> > VTN
> >
> >     ID is used to further identify the virtual sub-interface which is
> >
> >     associated with the VTN on the outgoing interface."
> >
> > I interpret this as meaning:
> >
> > -The IPv6 destination address is solely responsible for identifying
> > the IP next hop
> >
> > -The VTNI, along with the DSCP bits, determine how the packet is
> > forwarded to the next-hop
> >
> > So, I can think of the VTNI as "more DSCP bits".
> >
> > Do I have that right?
> >
> >
>                Ron
> >
> > Juniper Business Use Only
> >
> >
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