[Queens][neutron] multiple networks with same vlan id
Hello, I trying to create multiple networks with the same vlan id and different address but it is impossibile because neutron returns vlan id is already present. I tried with success on vcenter and it works. On openstack I can create more subnets with different adresses under the same vlan id, but instances receive static routes from dhcp for all subnets. Any workaround ? I am also trying with segments but they do not seem to fit my case. Regards Ignazio
Are you trying to create a new network each time? There is probably some different terminology in openstack vs vmware A network in openstack defines the underlying L2 switching device/ vlan/ vxlan / gre .. etc You can add as many subnets to a network as you would like to, and host routes can be added for each subnet. On Sat, Feb 8, 2020 at 10:00 AM Ignazio Cassano <ignaziocassano@gmail.com> wrote:
Hello, I trying to create multiple networks with the same vlan id and different address but it is impossibile because neutron returns vlan id is already present. I tried with success on vcenter and it works. On openstack I can create more subnets with different adresses under the same vlan id, but instances receive static routes from dhcp for all subnets. Any workaround ? I am also trying with segments but they do not seem to fit my case. Regards Ignazio
-- ~/DonnyD C: 805 814 6800 "No mission too difficult. No sacrifice too great. Duty First"
Hello Donny, I do not want to see long routing tables on instances. An instance in a network with many subnets, receives routing tables for all subnets. Ignazio Il Sab 8 Feb 2020, 17:22 Donny Davis <donny@fortnebula.com> ha scritto:
Are you trying to create a new network each time? There is probably some different terminology in openstack vs vmware
A network in openstack defines the underlying L2 switching device/ vlan/ vxlan / gre .. etc
You can add as many subnets to a network as you would like to, and host routes can be added for each subnet.
On Sat, Feb 8, 2020 at 10:00 AM Ignazio Cassano <ignaziocassano@gmail.com> wrote:
Hello, I trying to create multiple networks with the same vlan id and
different address but it is impossibile because neutron returns vlan id is already present.
I tried with success on vcenter and it works. On openstack I can create more subnets with different adresses under the same vlan id, but instances receive static routes from dhcp for all subnets. Any workaround ? I am also trying with segments but they do not seem to fit my case. Regards Ignazio
-- ~/DonnyD C: 805 814 6800 "No mission too difficult. No sacrifice too great. Duty First"
On 2020-02-08 18:53:54 +0100 (+0100), Ignazio Cassano wrote: [...]
I do not want to see long routing tables on instances. An instance in a network with many subnets, receives routing tables for all subnets. [...]
And as we've discussed recently on this list, if you're relying on DHCP there's a hard limit to the size of the route list it can provide in leases anyway, so the shorter the routing table per Neutron network, the better. -- Jeremy Stanley
Hello, In the case of Openstack the vlan driver permits to isolate each project's layer 2. This way each project's L3 can overlaps without any problem. You can create many L3 segments within only one VLAN ID. I do not use vcenter but for old ESXi it was "possible to create" many vswitches whom contains same vlan ID, but this is very different and vmware misuses term of switch. Best regards, Romain . ________________________________ From: Ignazio Cassano <ignaziocassano@gmail.com> Sent: Saturday, February 8, 2020 3:55 PM To: openstack-discuss Subject: [Queens][neutron] multiple networks with same vlan id Hello, I trying to create multiple networks with the same vlan id and different address but it is impossibile because neutron returns vlan id is already present. I tried with success on vcenter and it works. On openstack I can create more subnets with different adresses under the same vlan id, but instances receive static routes from dhcp for all subnets. Any workaround ? I am also trying with segments but they do not seem to fit my case. Regards Ignazio
Many thanks. Ignazio Il Sab 8 Feb 2020, 18:11 CHANU ROMAIN <romain.chanu@univ-lyon1.fr> ha scritto:
Hello,
In the case of Openstack the vlan driver permits to isolate each project's layer 2. This way each project's L3 can overlaps without any problem. You can create many L3 segments within only one VLAN ID.
I do not use vcenter but for old ESXi it was "possible to create" many vswitches whom contains same vlan ID, but this is very different and vmware misuses term of switch.
Best regards,
Romain . ------------------------------ *From:* Ignazio Cassano <ignaziocassano@gmail.com> *Sent:* Saturday, February 8, 2020 3:55 PM *To:* openstack-discuss *Subject:* [Queens][neutron] multiple networks with same vlan id
Hello, I trying to create multiple networks with the same vlan id and different address but it is impossibile because neutron returns vlan id is already present. I tried with success on vcenter and it works. On openstack I can create more subnets with different adresses under the same vlan id, but instances receive static routes from dhcp for all subnets. Any workaround ? I am also trying with segments but they do not seem to fit my case. Regards Ignazio
participants (4)
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CHANU ROMAIN
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Donny Davis
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Ignazio Cassano
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Jeremy Stanley