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From David Comerford <davest...@gmail.com>
Subject Re: Global setting: router.extra.public.nics
Date Wed, 03 Apr 2013 21:53:09 GMT
Ahh that makes sense. Answers my question nicely.
Thanks guys


On 3 April 2013 22:48, Kelven Yang <kelven.yang@citrix.com> wrote:

>
> On 4/3/13 5:43 AM, "prasanna" <tsp@apache.org> wrote:
>
> >On 3 April 2013 14:12, David Comerford <davestyle@gmail.com> wrote:
> >> Hi list,
> >>
> >> Can anyone tell me what "router.extra.public.nics" is used for?
> >>
> >> I recently noticed my routers had the default extra 2 NICs and I can't
> >>see
> >> any need for them.
> >> I've also noticed in VMware one of the extra public NICs gets the
> >>correct
> >> VLAN tag for public traffic but is added to the management vSwitch,
> >>which
> >> isn't tagged and won't work even if the NIC was used by the router.
> >>
> >
> >I can't say for sure but there's not much in the code (as comments or
> >otherwise) to explain the need for the extra nics. If you're not using
> >vmware as hypervisor this setting doesn't do anything at all. From
> >what I can tell - during router startup additional interfaces are
> >added to the vmware routers but the interface remains down.
>
>
> This configuration is no longer needed with introduction of NIC hot-plug
> support available in system VM template that is bound with VMware tools
> from VMware.
>
> In old system template that is shipped with Open VMware tools, NIC
> hot-plug is not supported, in order to support more public IP addresses on
> VR, we have to put a hacking solution, which is to pre-allocate NICs at
> VR's creation time, and then using script inside VR to bring it up on
> demand.
>
> router.extra.public.nics is there for such purpose, it tells CloudStack
> how many extra static NIC we need to allocate, and these extra NICs will
> be attached to a dummy port-group (which may appear confusing to some
> people about this behave)
>
> -Kelven
>
> >
>
>

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