Subject: Re: [Supa] Upload SUPA topology draft

From: zhayiyong <[email-masked]>
Date: Tue, 6 Jan 2015 13:02:31 +0000

Hi Andrew,

Thank you for your comments. Please see my comments in lines.

From: Supa [mailto:[email-masked]] On Behalf Of zhayiyong
Sent: Thursday, December 25, 2014 2:38 AM
To: Andrew Qu; [email-masked]<mailto:[email-masked]>; [email-masked]<mailto:[email-masked]>
Cc: fine_sz
Subject: Re: [Supa] Upload SUPA topology draft

Hi Andrew,

Thank you for the comments. I think it will be good to include the non IP scenario such as MPLS as you mentioned. Actually we are not only focusing on IP topology but also network layer including MPLS. We will change the name “IP topology”.
The “data link topology” describes topology in L2 that is anything under IP layer. In my opinion, the “data link topology” itself is an abstraction of a “logic link”, such as trunk or vlan.

[Andrew]  The principle of defining a good model is to have layering defined correctly.  To control plane,  it is not physical link that defines its topology, it
is logical link, as you just said,  to Control plane, it is L3 Vlan interface that represent the link which is logical and could run on many physical ports that
allow that vlan,   in the case of port-channel,  it is logical LAG port to control plane,  NOT those, say 16 members which form the LAG.

[Yiyong] Yes, the layering of a topology model is important and that is what we are doing right now. The topology model contains abstractions at different layer and can be used by different layers. The topology model should be a generic overlay model which only define elements and the layering. In my opinion, the “logic thing” depends on how to use the topology model. E.g. L3 vlan run on many physical ports means that the vlan can be defined by specifying all the ports from topology model.
The control plane is good understanding of layering, and should be added if it makes more sense to the operators.

Also, the “physical topology” should be the abstraction of physical layer and include the “physical data link”.

For the “site topology” which runs under physical topology, could you please explain more that?

[Andrew] network may be run on  top of many physical data centers and the topology of defining sites may
directly have impact to derive which fiber backbone network as physical link and other property such as
disaster recover backup DC, active-active relationship etc.
[Yiyong] I see what you mean. In this way, each DC can be abstracted as a node in the topology model. That is what we are doing for the DC data model.

Thanks,

Andrew

Best,
Yiyong

发件人: Andrew Qu [mailto:[email-masked]]
发送时间: 2014年12月23日 3:34
收件人: Andrew Qu; zhayiyong; [email-masked]<mailto:[email-masked]>; [email-masked]<mailto:[email-masked]>
抄送: fine_sz
主题: RE: Upload SUPA topology draft

Adding [email-masked]<mailto:[email-masked]> for comments

I think we need to modify original chart to the following with reasons below. please
comments.

Andrew

From: Andrew Qu
Sent: Thursday, December 18, 2014 11:25 AM
To: 'zhayiyong'; [email-masked]<mailto:[email-masked]>
Cc: fine_sz
Subject: RE: Upload SUPA topology draft

The following is the topology in my mind should be
difference between the draft and mine is the following:

change “IP topology”  to “control plane topology”
original “data link topology’ directly feed into control plane topology which is
not quite accurate.  control plane calculation don’t care media,  control plane works
on logical link (software interface index with link capacity such as p2p, or p2mp, or
10G etc, but these are all software logical link)

then the control plane topology is run on physical topology,
it is “physical topology” that run on “physical data link”

Also,  as physical topological, geographical site should be considered as
attribute of topology as well,  it will be “site”, then “physical topology”, then ….

This is just brainstorming,  please comments.

Andrew

From: zhayiyong [mailto:[email-masked]]
Sent: Thursday, December 18, 2014 12:03 AM
To: [email-masked]<mailto:[email-masked]>; Andrew Qu
Cc: fine_sz
Subject: Upload SUPA topology draft

Hi Luis, Andrew,

Please review the updated version of SUPA topology draft as attached. If everything is fine, I will upload it.

Best,
Yiyong Zha

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