Subject: Some introduction and explanation to Policies Migration. .

From: "Yingjie Gu(yingjie)" <[email-masked]>
Date: Mon, 25 Jul 2011 22:12:43 +0000

Hi all,

Hope you can have a look at the not-too-long email so that it could be easier for you to understand Thursday's presentation.

Thanks in advance.

In fact the name should be changed to "Operational State Migration" which can reflect the real problem.

In Data Center, Virtual Machine migrates from old location to new location for many reasons. In addition to migration of virtual resouces on server (solutions are provided by VM Vendors like VMWare), the network states also need to migrate, if we wang to keep running services undisrupted during VM Hot/Live Migration.

Take Tcp states on Firewall as an example. During VM running TCP states keep changing. If the VM migrates without the TCP states on Firewall migrate to the new Firewall, existing connections will be broken.

Two kinds of states on network: Configure state(configured by Network Manager) and operational state(generated by network devices based on traffic).  We focus on operational state migration, which is very time-sensitive, but the solution may also be applicable for configuration state migration.

Currently, I was suggested to look at MIDCOM and PCP to find out whether they can be reused. We have made gap analysis with MIDCOM. First of all, I need to point out that MIDCOM/PCP/new protocol for transfering the state is only part of the solution. The whole solution also need to consider two essential parts, i.e. 'Time trigger' and 'Feedback to VM Manager'.

Thank you for your attention. Any comments are highly appreciated.

B.R.

Yingjie Gu