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["Kannan, Hari" <hari.kannan@xxxxxx>]

Slightly off topic question - as I'm fairly new to O~S

What is the use case scenario for preference towards GRE vs VLAN? I would have thought GRE is "more" preferable as it doesn't require external h/w configuration as well as doesn't come with the VLAN scalability limitations etc..

What is a "preferred" deployment model? Why would I choose one over the other??

Hari

From: Openstack [mailto:openstack-bounces+hari.kannan=hp.com@xxxxxxxxxxxxxxxxxxx] On Behalf Of Aaron Rosen
Sent: Wednesday, June 05, 2013 3:26 AM
To: Chu Duc Minh
Cc: openstack@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Openstack] Quantum VLAN tag mismatch between Network-node and Compute-node

Hi,

Those vlan tags you are showing are not the actual tags that will be seen on the wire. Those tags are auto incremented and used for each new port that lands on a server that is in a different network. If you run ovs-ofctl dump-flows br-int you'll see those vlan tags are stripped off and the correct one is added.


Look here https://github.com/openstack/quantum/blob/master/quantum/plugins/openvswitch/agent/ovs_quantum_agent.py#L326 if your curious about what's going on.

Aaron

On Wed, Jun 5, 2013 at 2:25 AM, Chu Duc Minh <chu.ducminh@xxxxxxxxx<mailto:chu.ducminh@xxxxxxxxx>> wrote:
Hi, i'm converting from GRE tunnel to VLAN tagging, and deleted all old project/user/net/subnet.

in file /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini @ all nodes, I already set:
network_vlan_ranges = physnet1:2:4094
When I create a new net:
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | True                                 |
| id                        | 6d7b116e-be0b-4019-8769-a50a9ca13406 |
| name                      | net_proj_one                         |
| provider:network_type     | vlan                                 |
| provider:physical_network | physnet1                             |
| provider:segmentation_id  | 2                                    |
| router:external           | False                                |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   | 959fe9e0-a79d-4d0f-8040-ebfab26d8182 |
| tenant_id                 | 29ba82e97f374492a4ca02c62eb0a953     |
+---------------------------+--------------------------------------+

But when i show in network-node:
# ovs-vsctl show
...
Bridge br-int
        Port "tapdddef664-ee"
            tag: 1
            Interface "tapdddef664-ee"
                type: internal
        Port "qr-f9ba0308-2c"
            tag: 1
            Interface "qr-f9ba0308-2c"
                type: internal
        Port "int-br-eth0"
            Interface "int-br-eth0"
        Port br-int
            Interface br-int
                type: internal
    Bridge "br-eth0"
        Port "br-eth0"
            Interface "br-eth0"
                type: internal
        Port "phy-br-eth0"
            Interface "phy-br-eth0"
        Port "eth0"
            Interface "eth0"

interface for router & dhcp created are created in VLAN 1 (wrong! it should be created with VLAN 2)
I try to find in config and database, but i can't found which setting that start with VLAN 1.

Because of VLAN tag mismatch, I can't access to VM instance.
Another weird thing is on compute node, tag is not constant when i create/terminate new instance:
# ovs-vsctl show
a9900940-f882-42f8-9b7c-9b42393ed8a4
    Bridge "qbred613362-fe"
        Port "qvbed613362-fe"
            Interface "qvbed613362-fe"
        Port "qbred613362-fe"
            Interface "qbred613362-fe"
                type: internal
        Port "taped613362-fe"
            Interface "taped613362-fe"
    Bridge "br-eth1"
        Port "eth1"
            Interface "eth1"
        Port "br-eth1"
            Interface "br-eth1"
                type: internal
        Port "phy-br-eth1"
            Interface "phy-br-eth1"
    Bridge br-int
        Port br-int
            Interface br-int
                type: internal
        Port "qvo9816466e-22"
            tag: 5
            Interface "qvo9816466e-22"
        Port "int-br-eth1"
            Interface "int-br-eth1"
        Port "qvoed613362-fe"
            tag: 5
            Interface "qvoed613362-fe"
    Bridge "qbr9816466e-22"
        Port "qbr9816466e-22"
            Interface "qbr9816466e-22"
                type: internal
        Port "tap9816466e-22"
            Interface "tap9816466e-22"
        Port "qvb9816466e-22"
            Interface "qvb9816466e-22"
    Bridge "virbr0"
        Port "virbr0"
            Interface "virbr0"
                type: internal

Do you know why it happen?

When everything is ok, tag on both Network-node & Compute-node should equal 2 (for first VM network) when I configured "network_vlan_ranges = physnet1:2:4094" ??

Thank you very much!

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