A shared network means other tenants may create ports on that network (i.e. the VMs will share an L2 broadcast domain).
On Wed, Sep 17, 2014 at 6:58 PM, Zirui Zhuang <zr.zz....@gmail.com> wrote: > Hello everyone. > > As far as I'm concerned, a neutron network is actually a pure virtual > concept layer which holds couples of subnets. Subnets are the ones connect > and provide virtualized network access, internal ip arrangement, and basic > layer-2 isolation. When using a GRE tunnel mode, the isolation between > tenants' networks will be done by "Tenant Network ID", which provide a > layer-3 isolation. > However, it just makes me curious that, what does a shared network do? By > design it should isolate network flow on layer-3 level, which means only > instances within the same network will have the chance to communicate with > each other. As I can see, a shared network may allow different tenants to > access the identical network resources created by others. But what about > the connectivity? The network flow may be isolated by both the network id > and the tenant id for instances owned by different tenants in a shared > network. So what does the network actually shares? Only the "fixed IP" > arranged? If instances cannot communicates to each other then why bother to > share a network? > > If I'm wrong at any point please guide me. Thanks in advance. > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > -- Kevin Benton
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