[nemo-dev] 答复: The connectivity expression in NEMO

Xiayinben xiayinben at huawei.com
Thu Aug 13 07:02:16 UTC 2015


When tenant talk about “A communicate with C”, I think tenant care about SLA rather than bandwidth, because this communication is a service. SLA represent the quality of service(KQI).
NEMO engine can find a path to meet the SLA requirement.

Yinben

发件人: nemo-dev-bounces at lists.opendaylight.org [mailto:nemo-dev-bounces at lists.opendaylight.org] 代表 Jizhigang
发送时间: 2015年8月13日 14:05
收件人: Zhoutianran; nemo-dev at lists.opendaylight.org
主题: [nemo-dev] 答复: The connectivity expression in NEMO

I also support option 1. From the perspective of the user, option 1 is more simple, direct and easier to understand.
And I have a question. Based on option 2, A can communicate with C, but how to specify the bandwidth between them?

Regards,
Zhigang

发件人: nemo-dev-bounces at lists.opendaylight.org<mailto:nemo-dev-bounces at lists.opendaylight.org> [mailto:nemo-dev-bounces at lists.opendaylight.org] 代表 Zhoutianran
发送时间: 2015年8月13日 11:51
收件人: nemo-dev at lists.opendaylight.org<mailto:nemo-dev at lists.opendaylight.org>
主题: [nemo-dev] The connectivity expression in NEMO


Hi Team,



As I reviewed our model, I am thinking about this scenario.

I have the following user level topology, nodes are connected by connections:

[cid:image001.png at 01D0D5D8.3C8D9BB0]

There are two possible ways to interpret this as we have the same discussion on the IETF bar bof meeting.

1.  One node can only communicate with nodes with explicit connection. E.g, A can communicate with B and D, but not C.

2.  One node can communicate with all nodes with any connectivity. I.e, A can communicate with C since there is connectivity via B or D.



Personally, I support option 1. I think the “connection” should explicitly express the user’s intent for the connectivity. We cannot assume the intermediate nodes has the routing/forwarding capability.



However, option 2 will make the intent expression complex, and even worse have the user to know many details.

For example, with option 2, if the user only want A communicate with B and D. Then he has to know that C also has connectivity with A(this is hard). And he has to say “A cannot communicate with C”.





Best Regards,

Tianran
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