Also adding Salvatore. On Thu, Jul 30, 2015 at 9:12 PM, Gal Sagie <gal.sa...@gmail.com> wrote:
> Yes, i checked this on my setup. > For example, you can have both IPv6 and IPv4 subnets per the same network > (which maps to a logical switch) > and connect both as two different router ports (to the same router) > > You can also connect the same network to two different routers, i am not > sure if you need the extra route extension for that or not, i think you > could > configure it as default gateway with out this extension, but with the > extension you > can define routing between the two routers. > > > > > > On Thu, Jul 30, 2015 at 9:03 PM, Ben Pfaff <b...@nicira.com> wrote: > >> [adding Aaron Rosen] >> >> On Wed, Jul 29, 2015 at 12:20:30PM +0300, Gal Sagie wrote: >> > Currently Neutron support defining few subnets (IP cidrs) on a network >> > (logical switch) >> > and connecting them to the same router (or different routers). >> > Currently in the NB schema, the logical switch can be connected only to >> one >> > logical >> > router port. >> > >> > This needs to be extended so a logical switch can have more then one >> > logical router >> > port reference to support the above use case. >> >> Limiting a logical switch to a single router port is an intentional >> design decision. It means that a packet traverses at most two logical >> switches (one at ingress, one at egress), which simplifies some of the >> logical switch design, and it prevents loops. >> >> VMware's NVP controller uses the same design, for those reasons and >> others. The NVP paper from NSDI 2014 (see >> http://benpfaff.org/papers/net-virt.pdf) puts it this way: >> >> As an optimization, we constrain the logical topology such that >> logical L2 destinations can only be present at its edge[6]. This >> restriction means that the OVS flow table of a sending hypervisor >> needs only to have flows for logical datapaths to which its local >> VMs are attached as well as those of the L3 routers of the logical >> topology; the receiving hypervisor is determined by the logical IP >> destination address, leaving the last logical L2 hop to be executed >> at the receiving hypervisor. >> >> [6] We have found little value in supporting logical routers >> interconnected through logical switches without tenant VMs. >> >> Are you sure that Neutron supports multiple router ports per switch? >> Russell Bryant (in IRC) and Aaron Rosen (in a quick in-person chat) >> seemed doubtful. >> > > > > -- > Best Regards , > > The G. > -- Best Regards , The G. _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
